LSI MegaRAID SAS Controller Tasks
CH A P T E R
5
LSI MegaRAID SAS Controller Tasks
This chapter describes the LSI WebBIOS Configuration Utility (CU), which operates independently of
the operating system and enables you to create and manage RAID configurations on LSI MegaRAID
SAS controllers.
If your server has an integrated RAID SAS controller, see Chapter 4, “Configuring the LSI SAS2
Integrated RAID Controller.”
This chapter contains the following sections:
•
LSI MegaRAID Controller Management Utilities, page 5-1
•
LSI WebBIOS CU, page 5-2
•
Managing RAID, page 5-16
•
Determining Which Controller is in Your Server, page 5-22
•
Limitation on Importing Foreign Configuration To a Virtual Disk That is Under Construction,
page 5-25
LSI MegaRAID Controller Management Utilities
LSI offers these three main MegaRAID controller management utilities:
•
LSI WebBIOS Configuration Utility
•
MegaRAID Command Tool
•
MegaRAID Storage Manager Software
The LSI utilities have help documentation for more information about using the utilities.
For basic information on RAID and how to use the LSI utilities, see the following documentation:
•
LSI MegaRAID SAS Software User Guide (for LSI MegaRAID).
LSI WebBIOS Configuration Utility
The LSI WebBIOS Configuration Utility (CU) operates independently of the operating system and
enables you to create and manage RAID configurations on LSI MegaRAID SAS controllers.
Cisco UCS Servers RAID Guide
OL-26591-01
5-1
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
MegaRAID Command Tool
The LSI MegaRAID Command Tool (CT) is a command-line interface (CLI) utility that enables you to
configure, monitor, and maintain LSI MegaRAID SAS controllers and the devices connected to them.
MegaRAID Storage Manager
The LSI MegaRAID Storage Manager (MSM) is a software application with a graphical user interface
that enables you to configure, monitor, and maintain storage configurations on LSI MegaRAID SAS
controllers.
LSI WebBIOS CU
The LSI WebBIOS CU, unlike the LSI MegaRAID Storage Manager software, resides in the SAS
controller BIOS and operates independently of the operating system.
You can use the WebBIOS CU to do the following tasks:
•
Create drive groups and virtual drives for storage configurations.
•
Display controller, virtual drive, physical drive, and battery backup unit (BBU) properties, and
change parameters.
•
Delete virtual drives.
•
Migrate a storage configuration to a different RAID level.
•
Detect configuration mismatches.
•
Import a foreign configuration.
•
Scan devices connected to the controller.
•
Initialize virtual drives.
The WebBIOS CU provides a configuration wizard to guide you through the configuration of virtual
drives and drive groups.
Starting the WebBIOS CU
Step 1
When the host computer is booting, the following text appears:
Copyright© LSI Corporation
Press <Ctrl><H> for WebBIOS
Press Ctrl+H.
The Controller Selection window appears.
Step 2
If the system has multiple SAS controllers, choose a controller.
Step 3
Click Start to continue.
The main WebBIOS CU window appears. See Figure 5-1.
Cisco UCS Servers RAID Guide
5-2
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
WebBIOS CU Main Menu Window Options
Figure 5-1 shows the window that appears when you start the WebBIOS CU and choose a controller.
Figure 5-1
Main WebBIOS CU Window
Listed in the right pane are the following:
•
Virtual drives configured on the controller
•
Drives that are connected to the controller
•
Drives that are foreign or missing
Note
In the list of virtual drives, the drive nodes are sorted based on the order in which you added the drives
to the drive group, rather than the physical slot order that displays in the physical trees.
Note
The minimum screen resolution for WebBIOS is 640x480.
Click Physical View or Logical View in the left pane to toggle between the physical view and logical
view of the storage devices connected to the controller. When Physical View appears in the right pane,
it shows the drive groups that are configured on this controller.
For drives in an enclosure, the window shows the following drive information:
•
Enclosure
•
Slot
•
Interface type (such as SAS or SATA)
•
Drive type (HDD or SSD)
•
Drive size
Cisco UCS Servers RAID Guide
OL-26591-01
5-3
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
•
Drive status (such as Online or Unconfigured Good)
Toolbar
The toolbar at the top of the WebBIOS CU contains the following tools, from left to right (see
Figure 3-1):
•
Main window—Click to return to the main window from any other WebBIOS CU window.
•
Previous—Click to return to the previous window that you were viewing.
•
Exit—Click to exit the WebBIOS CU program.
•
Turn off alarm—Click to turn off the sound from the onboard controller alarm.
•
About—Click to display information about the WebBIOS CU version, browser version, and HTML
interface engine.
Menu Options
These options are located in the left pane of the main WebBIOS CU window (the hotkey shortcut for
each option is shown in parentheses next to the option name):
•
Controller Selection (Alt-c)— Views the Controller Selection window, where you can choose a
different SAS controller. You can then view information about the controller and the devices
connected to it, or create a new configuration on the controller.
•
Controller Properties (Alt-p)—Views the properties of the currently chosen SAS controller. For
more information, see Table 5-1.
•
Scan Devices (Alt-s)—Allows the WebBIOS CU to rescan the physical and virtual drives for any
changes in the drive status or the physical configuration. The WebBIOS CU displays the results of
the scan in the physical and virtual drive descriptions.
•
Virtual Drives (Alt-v)—Views the Virtual Drives window, where you can change and view virtual
drive properties, delete virtual drives, initialize drives, and perform other tasks. For more
information, see Viewing Virtual Drive Properties, Policies, and Operations, page 5-13.
•
Drives (Alt-d)—Views the Drives window, where you can view drive properties, create hot spares,
and perform other tasks. For more information, see Viewing Physical Drive Properties and
Operations, page 5-14.
•
Configuration Wizard (Alt-o)—Starts the Configuration Wizard and creates a new storage
configuration, clear a configuration, or add a configuration. For more information, see Configuring
RAID Drive Groups and Virtual Drives, page 5-5.
•
Logical View (Alt-l)—Toggles between the Physical View window and the Logical View window.
•
Physical View (Alt-h)—Toggles between the Physical View window and the Logical View window.
•
Events (Alt-e)—Views system events in the Event Information window. For more information, see
Managing RAID, page 5-16.
•
Exit (Alt+x)—Exits the WebBIOS CU and continue with system boot.
Cisco UCS Servers RAID Guide
5-4
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
Configuring RAID Drive Groups and Virtual Drives
This section describes how to use the WebBIOS CU Configuration Wizard to configure RAID drive
groups and virtual drives to create storage configurations.
Choosing the Configuration with the Configuration Wizard
Step 1
Click Configuration Wizard in the left pane of the WebBIOS main window.
The first Configuration Wizard window opens.
Step 2
Caution
Step 3
Choose a configuration type:
If you choose Clear Configuration or New Configuration, all existing data in the configuration is
deleted. Back up data that you want to keep before you choose a configuration type.
•
Clear Configuration—Clears the existing configuration.
•
New Configuration—Clears the existing configuration and allows you to create a new
configuration.
•
Add Configuration—Retains the existing storage configuration and adds new drives to it (this
option does not cause any data loss).
Click Next.
The WebBIOS Configuration Method window opens.
Step 4
Choose a configuration method:
•
Manual Configuration—Allows you to control all attributes of the new storage configuration as
you create drive groups and virtual drives, and set their parameters.
•
Automatic Configuration—Automatically creates an optimal RAID configuration.
If you choose Automatic Configuration, you can choose whether to create a redundant RAID drive
group or a nonredundant RAID 0 drive group. Choose one of the following from the Redundancy
drop-down list:
Redundancy when possible
No redundancy
Step 5
Click Next to continue.
•
For Automatic Configuration, continue with Using Automatic Configuration, page 5-5.
•
For Manual Configuration, continue with Using Manual Configuration, page 5-6.
Using Automatic Configuration
Step 1
When WebBIOS displays the proposed new configuration, review the information in the window, and
click Accept or click Back to change the configuration.
One of the following configuration appears:
Cisco UCS Servers RAID Guide
OL-26591-01
5-5
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
•
RAID 0—If you choose Automatic Configuration and No Redundancy, WebBIOS creates a
RAID 0 configuration.
•
RAID 1—If you choose Automatic Configuration and Redundancy when possible, and only two
drives are available, WebBIOS creates a RAID 1 configuration.
•
RAID 5—If you choose Automatic Configuration and Redundancy when possible, and three or
more drives are available, WebBIOS creates a RAID 5 configuration.
•
RAID 6—If you choose Automatic Configuration and Redundancy when possible, and the RAID
6 option is enabled, and three or more drives are available, WebBIOS creates a RAID 6
configuration.
Step 2
When you are prompted to save the configuration, click Yes.
Step 3
When you are prompted to initialize the new virtual drives, click Yes.
WebBIOS CU begins a background initialization of the virtual drives.
New RAID 5 virtual drives and new RAID 6 virtual drives require a minimum number of drives for a
background initialization to start. If there are fewer drives, the background initialization does not start.
The following number of drives is required:
•
New RAID 5 virtual drives must have at least five drives for a background initialization to start.
•
New RAID 6 virtual drives must have at least seven drives for a background initialization to start.
Using Manual Configuration
This section contains the procedures for creating RAID drive groups for RAID levels 0, 1, 5, 6, 00, 10,
50, and 60.
Using Manual Configuration (RAID 0, 1, 5, 6)
For more information about RAID levels, see RAID Levels, page 1-8.
Note
Step 1
RAID level 0 is not fault tolerant. If a drive in a RAID 0 drive group fails, the whole virtual drive (all
drives associated with the virtual drive) fails.
Choose Manual Configuration and click Next.
The Drive Group Definition window appears. Use this window to choose drives to create drive groups.
Step 2
Press and hold Ctrl while choosing two or more ready drives in the Drives pane.
Choose all of the drives for the drive group.
Step 3
Click Add To Array to move the drives to a proposed drive group configuration in the Drive Groups
pane.
If you need to undo the changes, click Reclaim.
Step 4
From the Encryption drop-down list, choose an encryption option.
Step 5
If needed, finish adding drives to the Drive Groups pane and click Accept DG.
Step 6
Click Next.
Cisco UCS Servers RAID Guide
5-6
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
The Virtual Drive Definition window appears. This window lists the possible RAID levels for the drive
group. Use this window to choose the RAID level, strip size, read policy, and other attributes for the new
virtual drives.
Step 7
Choose the virtual drive options using the drop-down list in the left pane (the default values are shown).
•
From the RAID Level drop-down list, choose the desired RAID option (RAID 0, 1, 5, or 6).
All of the possible RAID levels for the virtual drive are listed.
•
From the Strip Size drop-down list, choose one of the following:
8, 16, 32, 64, 128, 256, 512, 1024 KB. The default is 64 KB.
The strip size is the portion of a stripe that resides on a single drive in the drive group. The stripe
consists of the data segments that the RAID controller writes across multiple drives, not including
parity drives.
For example, consider a stripe that contains 64 KB of drive space and has 16 KB of data residing on
each drive in the stripe. In this case, the stripe size is 64 KB and the strip size is 16 KB. A larger
strip size produces higher read performance. If your server regularly performs random read requests,
choose a smaller strip size.
•
From the Access Policy drop-down list, choose one of the following:
– RW—Allows read/write access. This is the default.
– Read Only—Allows read-only access.
– Blocked—Does not allow access.
•
From the Read Policy drop-down list, choose one of the following:
– Normal—Disables the read-ahead capability. This is the default.
– Ahead—Enables read-ahead capability, which allows the controller to read sequentially ahead
of requested data and to store the additional data in cache memory, anticipating that the data
will be needed soon. This option speeds up reads for sequential data but there is little
improvement when accessing random data.
•
From the Write Policy drop-down list, choose one of the following:
– WBack—In Writeback mode, the controller sends a data transfer completion signal to the host
when the controller cache has received all of the data in a transaction. This setting is
recommended in Standard mode.
– WThru—In Writethrough mode, the controller sends a data transfer completion signal to the
host when the drive subsystem has received all of the data in a transaction. This is the default.
– Bad BBU—Choose this mode if you want the controller to use Writeback mode, but the
controller has no BBU or the BBU is bad. If you do not choose this option, the controller
firmware automatically switches to Writethrough mode if it detects a bad or missing BBU.
Caution
The LSI WebBIOS CU allows Writeback mode to be used with or without a battery. We recommend that
you use either a battery to protect the controller cache or an uninterruptable power supply (UPS) to
protect the entire system. If you do not use a battery or a UPS, and there is a power failure, you risk
losing the data in the controller cache.
•
From the IO Policy drop-down list, choose one of the following:
– Direct—In direct I/O mode, reads are not buffered in the cache memory. Data is transferred to
the cache and the host concurrently. If the same data block is read again, it comes from the cache
memory. This is the default.
Cisco UCS Servers RAID Guide
OL-26591-01
5-7
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
– Cached—In cached I/O mode, all reads are buffered in the cache memory.
The IO Policy applies to reads on a specific virtual drive. It does not affect the read-ahead cache.
•
From the Drive Cache drop-down list, choose one of the following:
– Enable—Enables the drive cache.
– Disable—Disables the drive cache.
– NoChange—Leaves the current drive cache policy as is. This is the default.
•
From the Disable BGI drop-down list, choose the background initialization status from the
following:
– No—Leaves background initialization enabled, which means that a new configuration can be
initialized in the background while you use WebBIOS to do other configuration tasks. This is
the default.
– Yes—Does not allow background initializations for configurations on this controller.
•
From the Select Size drop-down list, choose the size of the virtual drive in MB.
Normally, this would be the full size for RAID 0 shown in the Configuration pane. You can specify
a smaller size if you want to create other virtual drives in the same drive group.
Step 8
Click Accept to accept the changes to the virtual drive definitions.
If you need to undo the changes, click Reclaim.
Step 9
After you finish the virtual drive definitions, click Next.
The Configuration Preview window appears.
Step 10
Step 11
Check the virtual drive configuration in the Configuration Preview window and choose one of the
following:
•
If the virtual drive configuration is acceptable, click Accept to save the configuration.
•
Click Back to return to the previous windows and change the configuration.
Click Yes at the prompt to save the configuration.
The main WebBIOS CU window appears.
Using Manual Configuration (RAID 00, 10, 50, 60)
For more information about RAID levels, see RAID Levels, page 1-8.
Step 1
Choose Manual Configuration and click Next.
The Drive Group Definition window appears. Use this window to choose drives to create drive groups.
Step 2
Press and hold Ctrl while choosing ready drives in the Drives pane.
Choose all of the drives for the drive group.
Step 3
Click Add To Array to move the drives to a proposed drive group configuration in the Drive Groups
pane.
If you need to undo the changes, click Reclaim.
Step 4
If needed, finish adding drives to the Drive Groups pane and click Accept DG to create a RAID drive
group.
An icon for the next drive group appears in the Drive Groups pane.
Cisco UCS Servers RAID Guide
5-8
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
Step 5
Choose the drive group created in Step 4, and press and hold Ctrl while choosing more ready drives in
the Drives pane to create a second RAID drive group.
Step 6
Click Add To Array to move the drives to a second drive group configuration in the Drive Groups pane.
If you need to undo the changes, click Reclaim.
Note
RAID 00 supports a maximum of eight spans with a maximum of 32 drives per span.
Note
RAID 10 supports a maximum of eight spans with a maximum of 32 drives per span. You must use an
even number of drives in each RAID 10 drive group in the span.
Step 7
From the Encryption drop-down list, choose an encryption option.
Step 8
If needed, finish adding drives to the Drive Groups pane and click Accept DG to create a RAID 0 drive
group.
Step 9
Repeat Step 4 through Step 6 until you have chosen all the drives you want for the drive groups.
Step 10
After you finish adding drives to the Drive Groups pane, choose each drive group, and click Accept DG
after each drive group choice.
Step 11
Click Next.
The Span Definition window appears. This window shows the drive group holes that you can choose to
add to the Span pane.
Step 12
Press and hold Ctrl while you choose a drive group in the Array With Free Space pane, and click
Add to SPAN.
The drive group you chose appears in the Span pane.
Step 13
Press and hold Ctrl while you choose a second drive group, and click Add to SPAN.
Step 14
Repeat Step 12 and Step 13 until you have chosen all of the drive groups that you need.
Step 15
Click Next.
The Virtual Drive Definition window appears. This window lists the possible RAID levels for the drive
group. Use this window to choose the RAID level, strip size, read policy, and other attributes for the new
virtual drives.
Step 16
Press and hold Ctrl to choose the drive group in the Configuration pane, and then choose the virtual
drive options using the drop-down lists in the left pane (the default values are shown):
•
From the RAID Level drop-down list, choose The desired RAID level (RAID 00, 10, 50, or 60).
All of the possible RAID levels for the virtual drive are listed.
•
From the Strip Size drop-down list, choose one of the following:
8, 16, 32, 64, 128, 256, 512, 1024 KB. The default is 64 KB.
The strip size is the portion of a stripe that resides on a single drive in the drive group. The stripe
consists of the data segments that the RAID controller writes across multiple drives, not including
parity drives.
For example, consider a stripe that contains 64 KB of drive space and has 16 KB of data residing on
each drive in the stripe. In this case, the stripe size is 64 KB and the strip size is 16 KB. A larger
strip size produces higher read performance. If your server regularly performs random read requests,
choose a smaller strip size.
•
From the Access Policy drop-down list, choose one of the following:
Cisco UCS Servers RAID Guide
OL-26591-01
5-9
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
– RW—Allows read/write access. This is the default.
– Read Only—Allows read-only access.
– Blocked—Does not allow access.
•
From the Read Policy drop-down list, choose one of the following:
– Normal—Disables the read-ahead capability. This is the default.
– Ahead—Enables read-ahead capability, which allows the controller to read sequentially ahead
of requested data and to store the additional data in cache memory, anticipating that the data
will be needed soon. This speeds up reads for sequential data but there is little improvement
when accessing random data.
•
From the Write Policy drop-down list, choose one of the following:
– WBack—In Writeback mode, the controller sends a data transfer completion signal to the host
when the controller cache has received all of the data in a transaction. This setting is
recommended in Standard mode.
– WThru—In Writethrough mode, the controller sends a data transfer completion signal to the
host when the drive subsystem has received all of the data in a transaction. This is the default.
– Bad BBU—Choose this mode if you want the controller to use Writeback mode but the
controller has no BBU or the BBU is bad. If you do not choose this option, the controller
firmware automatically switches to Writethrough mode if it detects a bad or missing BBU.
Caution
LSI allows Writeback mode to be used with or without a battery. LSI recommends that you use either a
battery to protect the controller cache or an uninterruptable power supply (UPS) to protect the entire
system. If you do not use a battery or a UPS, and there is a power failure, you risk losing the data in the
controller cache.
•
From the IO Policy drop-down list, choose one of the following:
– Direct—In direct I/O mode, reads are not buffered in the cache memory. Data is transferred to
the cache and the host concurrently. If the same data block is read again, it comes from the cache
memory. This is the default.
– Cached—In cached I/O mode, all reads are buffered in the cache memory.
The IO Policy applies to reads on a specific virtual drive. It does not affect the read-ahead cache.
•
From the Drive Cache drop-down list, choose one of the following:
– Enable—Enables the drive cache.
– Disable—Disables the drive cache.
– NoChange—Leaves the current drive cache policy as is. This is the default.
•
From the Disable BGI drop-down list, choose the background initialization status from the
following:
– No—Leaves background initialization enabled, which means that a new configuration can be
initialized in the background while you use WebBIOS to do other configuration tasks. This is
the default.
– Yes—Does not allow background initializations for configurations on this controller.
•
From the Select Size drop-down list, choose the size of the virtual drive in MB.
Normally, this would be the full size for RAID 00 shown in the Configuration pane. You can specify
a smaller size if you want to create other virtual drives in the same drive group.
Cisco UCS Servers RAID Guide
5-10
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
Step 17
Click Accept to accept the changes to the virtual drive definitions.
If you need to undo the changes, click Reclaim.
Step 18
After you finish the virtual drive definitions, click Next.
The Configuration Preview window appears.
Step 19
Step 20
Check the virtual drive configuration in the Configuration Preview window and choose one of the
following:
•
If the virtual drive configuration is acceptable, click Accept to save the configuration.
•
Click Back to return to the previous windows and change the configuration.
Click Yes at the prompt to save the configuration.
The main WebBIOS CU window appears.
Viewing and Changing Device Properties
This section describes how you can use the WebBIOS CU to view and change the properties for
controllers, virtual drives, physical drives, and BBUs.
Viewing Controller Properties
WebBIOS displays information for one LSI SAS controller at a time. If your computer system has
multiple LSI SAS controllers, you can view information for a different controller by clicking Controller
Selection in the main window. When the Controller Selection window appears, choose the controller you
want from the list.
To view the properties of the current controller, follow these steps:
Step 1
Click Controller Properties in the main WebBIOS CU window.
There are three Controller Properties windows. The information in the first window is read-only and
cannot be modified directly. The window lists the number of virtual drives that are already defined on
this controller and the number of drives connected to the controller.
Step 2
Click Next to view the second Controller Properties window.
Step 3
Click Next to view the third Controller Properties window.
Table 5-1 describes the entries and options listed in the second and third Controller Properties windows.
LSI recommends that you leave these options at their default settings to achieve the best performance,
unless you have a specific reason for changing them.
Step 4
If you make changes to the options on these windows, click Submit to register them. If you change your
mind, click Reset to return the options to their default values.
Cisco UCS Servers RAID Guide
OL-26591-01
5-11
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
Table 5-1
Controller Properties Menu Options
Option
Description
Battery
Backup
Indicates whether the chosen controller has a BBU. If present, you can click Present
to view information about the BBU. For more information, see Viewing and Changing
Device Properties, page 5-11.
Set Factory
Defaults
Loads the default MegaRAID WebBIOS CU settings.
The default is No.
Rebuild
Rate
Chooses the rebuild rate for drives connected to the chosen controller. The default is
30 percent. The rebuild rate is the percentage of system resources dedicated to
rebuilding a failed drive. The higher the number, the more system resources are
devoted to a rebuild.
BGI Rate
Chooses the amount of system resources dedicated to background initialization of
virtual drives connected to the chosen controller. The default is 30 percent.
CC Rate
Chooses the amount of system resources dedicated to consistency checks of virtual
drives connected to the chosen controller. The default is 30 percent.
Reconstruction Chooses the amount of system resources dedicated to reconstruction of drives
Rate
connected to the chosen controller. The default is 30 percent.
Controller
BIOS
Enables or disables the BIOS for the chosen controller.
The default is Enabled. If the boot device is on the chosen controller, the BIOS must
be enabled. Otherwise, the BIOS should be disabled or it might not be possible to use
a boot device elsewhere.
NCQ
Native Command Queuing (NCQ) gives an individual drive the ability to optimize the
order in which it executes the read and write commands. The default is Enabled.
Coercion
Mode
Drive coercion is a tool for forcing drives of varying capacities to the same size so
they can be used in a drive group. The coercion mode options are None, 128MB-way,
and 1GB-way. The default is None.
The number you choose depends on how much the drives from various vendors vary
in their actual size. LSI recommends that you use the 1-GB coercion mode option.
SMART
Polling
Determines how frequently the controller polls for drives reporting a Predictive Drive
Failure (SMART: Self-Monitoring Analysis and Reporting Technology error). The
default is 300 seconds (5 minutes).
Alarm
Control
Enables, disables, or silences the onboard alarm tone generator on the controller. The
default is Disabled.
Patrol Read
Rate
Chooses the rate for patrol reads for drives connected to the chosen controller. The
default is 30 percent. The patrol read rate is the percentage of system resources
dedicated to running a patrol read.
See “Patrol Read-Related Controller Properties” in the Chapter 5 of the
LSI MegaRAID Software User Guide for additional information about patrol read.
Cache Flush
Interval
Controls the interval (in seconds) at which the contents of the onboard data cache are
flushed. The default is 4 seconds.
Spinup Drive
Count
Controls the number of drives that spin up simultaneously.
The default is 2 drives.
Cisco UCS Servers RAID Guide
5-12
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
Table 5-1
Controller Properties Menu Options (continued)
Option
Description
Spinup Delay
Controls the interval (in seconds) between the spinup of drives connected to this
controller. The delay prevents a drain on the system power supply that would occur if
all drives spun up at the same time.
The default is 12 seconds.
StopOnError
When enabled, this option stops the boot process when the controller BIOS
encounters an error during boot-up. The default is Disabled.
Spin Down
Delay Time
Controls the interval (in seconds) between the spindown of drives connected to this
controller. The delay prevents a drain on the system’s power supply that would occur
if all drives spun down at the same time.
The default is 30 minutes.
Stop CC on
Error
When enabled, this option stops a consistency check when the controller BIOS
encounters an error. The default is No.
Maintain PD
Fail History
Maintains the history of all drive failures. The default is Disabled.
Schedule CC
Indicates whether the option to schedule the date and time for a consistency check is
supported.
Viewing Virtual Drive Properties, Policies, and Operations
Step 1
Click the Virtual Drives icon in the right pane in the main WebBIOS CU window.
The Virtual Drive window displays the following information:
•
Properties area—Displays the virtual drive’s RAID level, state, capacity, and strip size information.
•
Policies area—Lists the virtual drive policies that were defined when the storage configuration was
created. For information about these policies, see Using Manual Configuration, page 5-6.
– Choose an option from any of the drop-down lists and click Change to change any of these
policies.
•
Operations area—Lists operations that can be performed on the virtual drive.
Choose from the following options and click Go to perform an operation:
– Delete—Deletes this virtual drive. For more information, see Deleting a Virtual Drive,
page 5-18.
– Fast Init—Initializes this virtual drive. A fast initialization quickly writes zeroes to the first and
last 10-MB regions of the new virtual drive and completes the initialization in the background.
– Slow Init—Initializes this virtual drive. A slow initialization is not complete until the entire
virtual drive has been initialized with zeroes. It is seldom necessary to use this option, because
the virtual drive was already initialized when you created it.
Caution
Before you run an initialization, back up any data on the virtual drive that you want to save. All data on
the virtual drive is lost when you initialize the drive.
– CC—Runs a consistency check on this virtual drive. For more information, see Using Manual
Configuration, page 5-6. (This option is not available for RAID 0 virtual drives.)
Cisco UCS Servers RAID Guide
OL-26591-01
5-13
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
– AdvOpers—Accesses windows to remove drives, migrates RAID levels (that is, changes the
virtual drive configuration by adding a drive and changing the RAID level).
See Migrating the RAID Level of a Virtual Drive, page 5-20 for information about adding a
drive to a virtual drive or migrating its RAID level.
– Expand—Increases the size of a virtual drive to occupy the remaining capacity in the drive
group. In addition, you can add drives to the virtual drive to increase the capacity.
Note
Drives can be added to a drive group only when there is a single virtual drive present on the
drive group. If there are multiple virtual drives present on the drive group, the option to add
an extra disk is not available.
See Expanding a Virtual Drive, page 5-16 for the procedure you can use to expand a virtual
drive.
Caution
Before you change a virtual drive configuration, back up any data on the virtual drive that you want to
save.
Viewing Physical Drive Properties and Operations
The Physical Drive window displays the properties of a chosen drive and then enables you to perform
operations on the drive.
To view drive properties and perform subsequent operations, follow these steps:
Step 1
Step 2
To access the Physical Drive window, choose one of the following options:
•
In the main WebBIOS CU window, in the Physical Drives area (in the right side), click a drive.
The Physical Drive window appears.
•
In the main WebBIOS CU window, click Physical Drives in the left pane. Then click a drive in the
right pane. The Physical Drive window appears.
Click Properties, and click Go. The drive properties window for the chosen drive appears.
The drive properties are view-only and include the state of the drive.
Step 3
If the drive state is Online, choose one of the following operations and click Go:
•
Note
•
Step 4
MakeDriveOffline—Forces the drive offline.
If you force offline a good drive that is part of a redundant drive group with a hot spare, the drive
rebuilds to the hot spare drive. The drive you forced offline goes into the Unconfigured Bad state.
Access the BIOS utility to set the drive to the Unconfigured Good state.
Locate—Makes the LED flash on the drive, which works only if the drive is installed in a drive
enclosure.
If the drive state is Unconfigured Good, choose one of the four following operations and click Go:
•
Make Global HSP—Makes a global hot spare available to all of the virtual drives.
•
Make Dedicated HSP—Makes a hot spare dedicated to a specific virtual drive.
Cisco UCS Servers RAID Guide
5-14
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
LSI WebBIOS CU
WebBIOS displays the global hot spare as Global and the dedicated hot spare as Ded. The icon for
the dedicated hot spare displays under its associated virtual drive. The drive number, drive state,
drive capacity, and drive manufacturer display.
•
Enclosure Affinity—Specifies where the hot spare is used first.
If there are drive failures present on a split backplane configuration, then the hot spare will be used
first on the backplane side that it resides in.
•
Prepare for Removal—Prepares the drive for removal from the enclosure.
The Prepare for Removal feature is different from spinning a drive down into powersave mode,
because it also involves flagging the drive as ready to remove. Therefore, if you choose to prepare
a drive for removal, Ready to Remove displays in the device tree for that drive, instead of
Powersave.
Viewing and Changing Battery Backup Unit Information
If your SAS controller has a battery backup unit (BBU), you can view information and change settings.
Step 1
Click Controller Properties in the main WebBIOS CU window. The first Controller Information
window appears.
Step 2
Click Next to view the second Controller Properties window.
The second Controller Properties window appears. The Battery Backup field indicates whether the
BBU is present.
Step 3
Click Present in the Battery Backup field.
The Battery Module window appears. This window contains the following information:
•
Battery information
•
Design information
•
Capacity information
•
Auto Learn properties and settings
Most of the Battery Module properties are view-only and are self-explanatory.
In the lower right corner of the window are the auto learn options. A learning cycle is a battery
calibration operation performed by the controller periodically to determine the condition of the battery.
You can change the learn delay interval (the length of time between automatic learning cycles) and the
auto learn mode.
Note
LSI recommends leaving the learn delay interval and the auto learn mode at their default settings.
Cisco UCS Servers RAID Guide
OL-26591-01
5-15
Chapter 5
LSI MegaRAID SAS Controller Tasks
Managing RAID
Managing RAID
This section includes information about maintaining and managing storage configurations.
Expanding a Virtual Drive
You can increase the size of a virtual drive to occupy the remaining capacity in a drive group.
Note
You can expand a virtual drive only if it is the only virtual drive present in the drive group. When multiple
virtual drives are present in a drive group, you cannot expand the virtual drives.
In addition, you can add drives to the virtual drive to increase capacity.
Note
Drives can be added to a drive group only when there is a single virtual drive present on the drive group.
When multiple virtual drives present on the drive group, the option to add an extra disk is not available.
Step 1
Click a virtual drive icon in the right pane of the main WebBIOS CU window to access the Virtual
Drive window. The Virtual Drive window appears.
Step 2
Choose the Expand radio button and click Go. The Expand Virtual Drive window appears.
Step 3
Enter the percentage of the available capacity that you want the virtual drive to use.
For example, if 100 GB capacity is available and you want to increase the size of the virtual drive by 30
GB, choose 30 percent.
Step 4
Click Calculate to determine the capacity of the virtual drive after expansion.
Step 5
Click Ok. The virtual drive expands by the chosen percentage of the available capacity.
Monitoring Array Health
You should periodically run a consistency check on fault-tolerant virtual drives. A consistency check
verifies that the redundancy data is correct and available for RAID 1, RAID 5, RAID 6, RAID 10,
RAID 50, and RAID 60 drive groups.
Step 1
In the main WebBIOS CU window, choose a virtual drive.
Step 2
Click Virtual Drives.
Step 3
When the Virtual Drive window appears, click the CC radio button, and click Go.
The consistency check begins.
Cisco UCS Servers RAID Guide
5-16
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
Managing RAID
Note
If the WebBIOS CU finds a difference between the data and the parity value on the redundant drive
group, it assumes that the data is accurate and automatically corrects the parity value. Be sure to back
up the data before running a consistency check if you think the data might be corrupted.
Recovery
MegaRAID Recovery, also known as Snapshot, offers a simplified way to recover data and provides
automatic protection for the boot volume. You can use the Recovery feature to take a snapshot of a
volume and to restore a volume or file. Snapshot functionality allows you to capture data changes to the
volume, and, if data is deleted accidentally or maliciously, you can restore the data from the view or roll
back to a snapshot at a previous point-in-time (PiT). MegaRAID Recovery supports up to eight snapshots
of PiTs for each volume.
Each Recovery PiT volume snapshot is typically a fraction of the original volume size, because it tracks
only the changes that are made to a volume after the PiT is created. The disk space for PiTs is reserved
in the Snapshot Repository virtual drive, and the PiT is expanded in small increments as new data is
written to the volume. Multiple PiTs of each volume can be retained online, enabling frequent snapshots
to be stored in a space-efficient manner.
Caution
Do not select the virtual drive containing the operating system (OS) as the Snapshot Repository. Updates
to the operating system or operating system crashes could destroy data on that virtual drive.
Three primary scenarios in which to use the Recovery feature are as follows:
1.
Restore the missing or deleted files (restore from view).
a. Discover that files are missing or deleted.
b. Review the Snapshot views of the file content (also known as “mounting” a snapshot) from each
PiT until you find the missing file.
A Snapshot view contains the content from the Point-in-Time at which the snapshot was made.
c. Drag and drop the missing file from the Snapshot view back into the online storage volume that
was the source of the Snapshot.
2.
If there are corrupt operating system files in a volume, roll back the volume to a previous state:
a. Reboot the system and run WebBIOS.
b. Select the most recent snapshot that does not contain the corrupted or malicious file to roll back
to. Select the most recent PiT snapshot to roll back to.
c. Reboot the system.
The system automatically rolls back to its previous state based on the selected PiT snapshot.
3.
Reduce the risk of extended downtime during application updates/upgrades in the IT center:
a. When the application is offline, take a snapshot of the application volume.
b. Install each patch individually and test for any new defects that might have been introduced.
c. Take a snapshot after you test each patch and determine that it is clean.
Cisco UCS Servers RAID Guide
OL-26591-01
5-17
Chapter 5
LSI MegaRAID SAS Controller Tasks
Managing RAID
d. If a defect is introduced, roll back to the previous installation and bypass the installation of the
defective patch.
Note
If the volume is still damaged, continue to select from the next most current PiT snapshot to the oldest.
You can enable the Recovery advanced software in WebBIOS. After you enable Recovery, you create
two virtual drives: one as a Snapshot Base or source and the other as a Snapshot Repository. The
Snapshot Base virtual drive contains the data that is stored in the repository virtual drive.
Deleting a Virtual Drive
You can delete any virtual drive on the controller if you want to reuse that space for a new virtual drive.
The WebBIOS CU provides a list of configurable drive groups where there is a space to configure. If
multiple virtual drives are defined on a single drive group, you can delete a virtual drive without deleting
the whole drive group.
Caution
Back up any data that you want to keep before you delete the virtual drive.
Step 1
Click a virtual drive icon in the right pane in the main WebBIOS CU window to access the Virtual
Drive window. The Virtual Drive window appears.
Step 2
Click the Delete radio button in the Operations area, and click Go.
Step 3
When the message appears, confirm that you want to delete the virtual drive.
Migrating an Array to a New Server
A foreign configuration is a storage configuration that already exists on a set of drives that you install in
a server. To migrate an existing array from one server to another, as in the case of a server replacement,
the new server must have the same controller type as the server on which the array was initially created.
In addition, if one or more drives are removed from a configuration, by a cable pull or drive removal, for
example, the configuration on those drives is considered a foreign configuration by the RAID controller.
The BIOS CU allows you to import the foreign configuration to the RAID controller, or to clear the
configuration so you can create a new configuration using these drives.
Note
When you create a new configuration, the WebBIOS CU shows only the unconfigured drives. Drives that
have existing configurations, including foreign configurations, do not appear. To use drives with existing
configurations, you must first clear the configuration on those drives.
If WebBIOS CU detects a foreign configuration, the Foreign Configuration window appears.
Step 1
In the Foreign Configuration window, click the Select Configuration drop-down list to show the
configurations.
Cisco UCS Servers RAID Guide
5-18
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
Managing RAID
The GUID (Global Unique Identifier) entries in the drop-down list are OEM names and will vary from
one installation to another.
Step 2
Choose a configuration or All Configurations.
Step 3
To preview or clear a foreign configuration, do one of the following:
•
Click Preview to preview the foreign configuration. The Foreign Configuration Preview window
appears.
•
Click Clear to clear the foreign configuration and reuse the drives for another virtual drive.
If you click Cancel, it cancels the importation or preview of the foreign configuration.
The right pane shows the virtual drive properties of the foreign configuration. The left pane shows the
drives in the foreign configuration.
Step 4
Click Import to import this foreign configuration and use it on this controller.
If you click Cancel, you return to the Foreign Configuration window.
Foreign Configurations in Cable Pull and Drive Removal Scenarios
If one or more drives are removed from a configuration, for example, by a cable pull or drive removal,
the configuration on those drives is considered a foreign configuration by the RAID controller.
Use the Foreign Configuration Preview window to import or clear the foreign configuration in each
case. The import procedure and clear procedure are described in Migrating an Array to a New Server,
page 5-18.
Note
If you want to import the foreign configuration in any of the following scenarios, you should have all of
the drives in the enclosure before you perform the import operation.
The following scenarios can occur with cable pulls or drive removals:
•
Scenario 1: If all of the drives in a configuration are removed and reinserted, the controller considers
the drives to have foreign configurations.
Import or clear the foreign configuration. If you choose Import, automatic rebuilds occur in
redundant virtual drives.
Note
Start a consistency check immediately after the rebuild is complete to ensure data integrity for the virtual
drives.
•
Scenario 2: If some of the drives in a configuration are removed and reinserted, the controller
considers the drives to have foreign configurations.
Import or clear the foreign configuration. If you choose Import, automatic rebuilds occur in
redundant virtual drives.
Note
Start a consistency check immediately after the rebuild is complete to ensure data integrity for the virtual
drives.
•
Scenario 3: If all of the drives in a virtual drive are removed, but at different times, and reinserted,
the controller considers the drives to have foreign configurations.
Cisco UCS Servers RAID Guide
OL-26591-01
5-19
Chapter 5
LSI MegaRAID SAS Controller Tasks
Managing RAID
Import or clear the foreign configuration. If you choose Import, all drives that were pulled before
the virtual drive became offline are imported and automatically rebuilt. Automatic rebuilds occur in
redundant virtual drives.
•
Scenario 4: If the drives in a nonredundant virtual drive are removed, the controller considers the
drives to have foreign configurations.
Import or clear the foreign configuration. No rebuilds occur after the import operation because there
is no redundant data with which to rebuild the drives.
Importing Foreign Configurations from Integrated RAID to MegaRAID
The LSI Integrated RAID solution simplifies the configuration options and provides firmware support
in its host controllers. LSI offers two types of Integrated RAID (IR): Integrated Mirroring (IM) and
Integrated Striping (IS).
You can import an IM or IS RAID configuration from an IR system into a MegaRAID system. The
MegaRAID system treats the IR configuration as a foreign configuration. You can import or clear the IR
configuration.
Note
For more information about Integrated RAID, see Chapter 4, “Configuring the LSI SAS2 Integrated
RAID Controller.”
Troubleshooting Information
An IR virtual drive can have either 64 MB or 512 MB available for metadata at the end of the drive. This
data is in LSI Data Format (LDF). MegaRAID virtual drives have 512 MB for metadata at the end of the
drive in the Disk Data Format (DDF).
To import an IR virtual drive into MegaRAID, the IR virtual drive must have 512 MB in the metadata,
which is the same amount of metadata as in a MegaRAID virtual drive. If the IR virtual drive has only
64 MB when you attempt to import it into MegaRAID, the import fails because the last 448 MB of your
data is overwritten and the data is lost.
If your IR virtual drive has only 64 MB for metadata at the end of the drive, you cannot import the virtual
drive into MegaRAID. You need to use another upgrade method, such as backup/restore to the upgraded
virtual drive type.
To import an IR virtual drive into a MegaRAID system, use the Foreign Configuration Preview window
to import or clear the foreign configuration. The import procedure and the clear procedure are described
in Migrating an Array to a New Server, page 5-18.
Migrating the RAID Level of a Virtual Drive
As the amount of data and the number of drives in your system increase, you can use RAID-level
migration to change a virtual drive from one RAID level to another. You do not have to power down or
reboot the system. When you migrate a virtual drive, you can keep the same number of drives, or you
can add drives. You can use the WebBIOS CU to migrate the RAID level of an existing virtual drive.
Note
While you can apply RAID-level migration at any time, LSI recommends that you do so when there are
no reboots. Many operating systems issue I/O operations serially (one at a time) during boot. With a
RAID-level migration running, a boot can often take more than 15 minutes.
Cisco UCS Servers RAID Guide
5-20
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
Managing RAID
Migrations are allowed for the following RAID levels:
• RAID 0 to RAID 1
• RAID 0 to RAID 5
•
RAID 0 to RAID 6
•
RAID 1 to RAID 0
• RAID 1 to RAID 5
•
RAID 1 to RAID 6
•
RAID 5 to RAID 0
•
RAID 5 to RAID 6
•
RAID 6 to RAID 0
•
RAID 6 to RAID 5
Table 5-2 lists the number of additional drives required when you change the RAID level of a virtual
drive.
Table 5-2
Caution
Additional Drives Required for RAID-Level Migration
From RAID Level
to RAID Level
Original Number of Drives
in the Drive Group
Additional Drives
Required
RAID 0 to RAID 1
RAID 0: 1 drive
1
RAID 0 to RAID 5
RAID 0: 1 drive
2
RAID 0 to RAID 6
RAID 0: 1 drive
3
RAID 1 to RAID 5
RAID 1: 2 drives
1
RAID 1 to RAID 6
RAID 1: 2 drives
1
Back up any data that you want to keep before you change the RAID level of the virtual drive.
Step 1
In the main WebBIOS CU window, choose a virtual drive.
Step 2
Click Virtual Drives. The Virtual Drive window appears.
Step 3
Click the AdvOpers radio button. The Advanced Operations window appears.
Step 4
Choose either Change RAID Level or Change RAID Level and Add Drive.
•
If you choose Change RAID Level, change the RAID level from the drop-down list.
•
If you choose Change RAID Level and Add Drive, change the RAID level from the drop-down list
and choose one or more drives to add from the list of drives.
The available RAID levels are limited, based on the current RAID level of the virtual drive plus the
number of drives available.
Step 5
Click Go.
Step 6
When the message appears, confirm that you want to migrate the RAID level of the virtual drive.
Cisco UCS Servers RAID Guide
OL-26591-01
5-21
Chapter 5
LSI MegaRAID SAS Controller Tasks
Determining Which Controller is in Your Server
A reconstruction operation begins on the virtual drive. You must wait until the reconstruction is
completed before you perform any other tasks in the WebBIOS CU.
Determining Which Controller is in Your Server
There is a dedicated SAS riser slot for the RAID controller card in a C-series chassis. There is also a
mounting point inside the chassis for the optional RAID battery backup unit that is available when using
the appropriate LSI controller.
Supported RAID controllers for all models are listed in RAID Controllers in UCS Servers, page 3-10.
If you do not have a record of which option is used in your server, you can read the on-screen messages
that are displayed during system bootup
Information about the card models installed are displayed as part of the verbose boot. You are also
prompted to press Ctrl-H to launch configuration utilities for those cards. For servers running CIMC
firmware earlier than release 1.2(1), see also Disabling Quiet Boot for CIMC Firmware Earlier than
Release 1.2(1), page 5-22.
Disabling Quiet Boot for CIMC Firmware Earlier than Release 1.2(1)
For CIMC firmware and BIOS release 1.2(1) and later releases, Quiet Boot has been removed and is no
longer needed. If you are running CIMC firmware and BIOS earlier than release 1.2(1), you can use the
following procedure to disable Quiet Boot.
Step 1
Boot the server and watch for the F2 prompt.
Step 2
Press F2 when prompted to enter the BIOS Setup utility.
Step 3
On the Main page of the BIOS Setup utility, set Quiet Boot to Disabled.
This action allows non default messages, prompts, and POST messages to display during bootup instead
of the Cisco logo window.
Step 4
Press F10 to save your changes, and to exit the utility.
Launching an Option ROM-Based Controller Utility
To alter the RAID configurations on your hard drives, you can use your host-based utilities that you
install on top of your host OS, or you can use the LSI option ROM-based utilities that are installed on
the server.
When you boot the server and you have quiet boot disabled, information about your controller is
displayed. The prompts for the key combination to launch the option ROM-based utilities for your
controller are also displayed.
Cisco UCS Servers RAID Guide
5-22
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
Determining Which Controller is in Your Server
Step 1
Watch for the prompt for your controller during verbose boot:
Step 2
Press Ctrl-H for the LSI controller utility.
Note
Cisco has also developed the Cisco Server Configuration Utility for C-Series servers, which can assist
you in setting up some RAID configurations for your drives. This utility is shipped with new servers on
CD. You can also download the ISO from Cisco.com. See the user documentation for this utility at the
following URL:
http://www.cisco.com/en/US/docs/unified_computing/ucs/sw/ucsscu/user/guide/20/SCUUG20.html
LSI MegaRAID Card Beep Codes
Table 5-3 contains a summary of the LSI MegaRAID card beep codes. These beep codes indicate activity
and changes from the optimal state of your RAID array. For full documentation on the LSI MegaRAID
cards and the LSI utilities, refer to the LSI documentation for your card.
Table 5-3
Summary of LSI MegaRAID Card Beep Codes
Beep Code
LSI Firmware State
3 seconds on, 1 second off
SPEAKER_OFFLINE_ENTRY
1 second on, 1 second off
1 second on, 3 seconds off
SPEAKER_DEGRADED_ENTRY
SPEAKER_HOTSPARE_ENTRY
Cause (Depending on RAID Level)
•
RAID 0: One or more drives offline.
•
RAID 1: Two drives offline.
•
RAID 5: Two or more drives offline.
•
RAID 6: More than two drives offline.
•
RAID 1: A mirrored drive failed.
•
RAID 5: One drive failed.
•
RAID 6: One or two drives failed.
A hot spare drive has completed the rebuild process
and has been brought into the array.
Restoring the RAID Configuration After Replacing a RAID Controller
When you replace a RAID controller, the RAID configuration that is stored in the controller is lost. Use
the following procedure to restore your RAID configuration to your new RAID controller.
Step 1
Replace your RAID controller. See your server documentation for specific steps.
Step 2
If you are performing a full chassis swap, replace all drives into the drive bays, in the same order that
they were installed in the old chassis.
Step 3
If Quiet Boot is enabled, disable it in the system BIOS. See Disabling Quiet Boot for CIMC Firmware
Earlier than Release 1.2(1), page 5-22.
Step 4
Reboot the server and watch for the message to press F.
Step 5
Press F when you see the following on-screen message:
Cisco UCS Servers RAID Guide
OL-26591-01
5-23
Chapter 5
LSI MegaRAID SAS Controller Tasks
Determining Which Controller is in Your Server
Foreign configuration(s) found on adapter.
Press any key to continue or ‘C’ load the configuration utility,
or ‘F’ to import foreign configuration(s) and continue.
Step 6
Press any key (other than C) to continue when you see the following on-screen message:
All of the disks from your previous configuration are gone. If this is
an unexpected message, then please power of your system and check your cables
to ensure all disks are present.
Press any key to continue, or ‘C’ to load the configuration utility.
Cisco UCS Servers RAID Guide
5-24
OL-26591-01
Chapter 5
LSI MegaRAID SAS Controller Tasks
Limitation on Importing Foreign Configuration To a Virtual Disk That is Under Construction
Step 7
Watch the subsequent windows for confirmation that your RAID configuration was imported correctly.
•
If you see the following message, your configuration was successfully imported. The LSI virtual
drive is also listed among the storage devices.
N Virtual Drive(s) found on host adapter.
•
If you see the following message, your configuration was not imported which can happen if you do
not press F quickly enough when prompted. In this case, reboot the server and try the import
operation again when you are prompted to press F.
0 Virtual Drive(s) found on host adapter.
Limitation on Importing Foreign Configuration To a Virtual Disk
That is Under Construction
Limitation
When the reconstruction operation of a virtual disk (VD) is in progress and the controller fails or the VD
changes to an offline state, you cannot import the foreign configuration and the VD cannot be recovered.
Design
The Avago MegaRAID firmware provides the ability to migrate a VD from any basic RAID level to any
basic RAID level without affecting the system availability or disrupting any other functionality. This is
called RAID level migration (RLM). The firmware verifies that the disk group that contains the virtual
drives that are being migrated has sufficient space to complete the migration before the migration
operation starts. The user data size of the target virtual drive must be greater than or equal to the source
virtual drive.
The limitations of this design are as follows.
•
The RLM operation cannot be aborted once started.
•
If all of the VDs that are undergoing the RLM operation change their state to offline (drives are
pulled out or the enclosure powers off) and then if drives return, the VD is foreign and in offline
state.
•
The MegaRAID firmware stores some of the reconstruction-specific information in the NVRAM but
does not store the reconstruction check point data or metadata in the disk data format (DDF) area.
Then the VD enters into the morphing state.
During the next reboot, if the VD is still in the offline mode, the user is notified with a boot message that
some of the virtual drives might become offline. A VD cannot be imported when it is in the morphing
state because the firmware cannot determine the state or type of the morphing activity. These VDs are
unusable and the user cannot import them.
Cisco UCS Servers RAID Guide
OL-26591-01
5-25
Chapter 5
LSI MegaRAID SAS Controller Tasks
Limitation on Importing Foreign Configuration To a Virtual Disk That is Under Construction
Prerequisites For Reconstruction to Start
Firmware performs checks before starting the reconstruction operation on a VD. It fails the
reconstruction command if any of the following conditions exist:
•
Reconstruction is already active (multiple reconstructions are not allowed).
•
Rebuild operation is active.
•
Copyback operation is active.
•
Check Consistency is active.
•
Background Initialization is active.
•
Virtual drive initialization is active.
•
All the virtual drives (maximum supported) are configured.
•
All the arrays (maximum supported) are configured.
•
Logical volume to be reconstructed is OFFLINE.
•
If the new RAID level is not equal to 0, 1, 5 and 6.
•
Operation other than INSERT, DELETE and NONE.
•
New Row Size or New PD Count is greater than maximum disks per array.
•
Premium feature RAID5 is disabled and the new RAID level will be RAID5 or premium feature
RAID6 is disabled and the new RAID level will be RAID6.
•
Pinned cache is present.
•
More than one VD in the disk group and total number of spans for the VD is greater than 1.
•
R1E virtual drive which is shown as R10.
The firmware blocks the following operations if reconstruction is in progress:
•
Any descriptor command (DCMD) related to configuration changes
•
Logical drive initialization
•
Rebuild Drive
•
Second Reconstruction
•
Flashing RAID Firmware
•
Check Consistency
•
Background Initialization
•
Hot spare commissioning
•
Patrol read
•
Turning off Protection Information (PI), which will remove protection from any existing logical
disks.
Cisco UCS Servers RAID Guide
5-26
OL-26591-01
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement