CH A P T E R
8
Configuring Boot Order and RAID Levels
You can configure the server BIOS boot order settings and perform RAID configuration using the Server
Configuration function.
This chapter contains the following sections:
•
Boot Order Configuration, page 8-1
•
RAID Configuration, page 8-1
Boot Order Configuration
UCS-SCU displays a list of all bootable devices on the server.
To set the BIOS boot order of your server, follow these steps:
Step 1
Click Server Configuration in the left navigation pane, and then click Boot order Configuration. You
can choose the devices that you want to participate in the boot order configuration, using the arrow keys
between the Device Types and Boot Order column.
Step 2
Highlight a device in the Device Types column (choose from either HDD, CD/DVD, Internal EFI Shell,
Network Device, or FDD), click the left-to-right arrow key to arrange the server boot order that you
prefer, and click Apply.
Step 3
Click Apply.
The Boot Order is saved on this server.
Step 4
Note
Reset the boot order by clicking Reset.
If the system has multiple boot devices under each component, for example, if the system has multiple
bootable hard disks under the same controller or CD drives, SCU will not display this information. You
will have to enter the BIOS and configure the order of these subcomponents manually.
RAID Configuration
You can use the RAID Configuration functionality to configure the on-board or PCIe supported RAID
controller cards.
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RAID Configuration
If your system has multiple RAID controllers, UCS-SCU displays a list of all available RAID cards, and
physical and logical disks on the RAID Configuration page.
The following RAID configuration options are available:
•
Automatic setup with redundancy
•
Automatic setup without redundancy
•
Single RAID levels—RAID 0, RAID 1, RAID 5 and RAID 6
•
Nested RAID levels—RAID 10, RAID 50 and RAID 60
This section includes the following sections:
•
RAID Configuration Page Components, page 8-2
•
Configuring RAID Arrays, page 8-3
•
Clearing RAID Arrays, page 8-7
RAID Configuration Page Components
This section describes the RAID Configuration page and contains the following topics:
•
Physical Disks Table, page 8-2
•
Logical Disks Table, page 8-3
Physical Disks Table
The Physical Disks table in the RAID Configuration page lists the following:
•
ID—The identifying number of the physical disk.
•
Slot—The slot in which the physical disk belongs.
•
State—The status of the disk. For more information about the various disk states, go to Table 8-1.
•
Size—The size of the physical disk.
•
Device Speed—The disk access speed of the controller.
•
Link Speed—The link speed of the controller.
•
Logical Disk—The logical disk to which the physical disk belongs to.
Table 8-1 describes the various disk status conditions.
Table 8-1
Disk Status Conditions
Status Condition
Description
Online
The drive is already used in another array.
Global Hotspare
The drive will be used to repair any array in the system that had a drive
failure, if the failed drive is equal to, or smaller than the hot spare drive.
Unconfigured Good
The drive is unused or available.
Ready
The drive is online and operating correctly.
Offline
The drive is offline or absent. No actions can be performed on the drive
until it is back online.
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Table 8-1
Disk Status Conditions
Status Condition
Description
Unconfigured Bad
The drive is not operational and needs to be replaced.
Disks with a status of "Unconfigured bad" cannot be used for RAID
configurations.
Foreign
The drive is part of an array created on a different controller, or created
within one enclosure and moved to another on the same controller. It can
be used to create a new array after clearing the configuration.
Logical Disks Table
The logical disks pane in the RAID Configuration page displays the information about the logical disks.
Table 8-2 explains the RAID array attributes.
Table 8-2
RAID Array Attributes
Option
Description
ID
Unique ID to the logical disk.
Size
Logical drive size. The maximum value depends on RAID level selected and the
physical disks size involved.
Primary RAID
level
RAID 0 (Data striping), 1 (Disk Mirroring), 5 (Data Striping with Striped
Parity), 6 (Distributed Parity and Disk Striping).
Secondary
RAID Level
Applicable only for nested RAID levels.
Stripe size
Size of the data stripe across all disks. Each physical disk has a smaller stripe
of data. The sum of all the stripes equals the stripe size.
Read policy
No Read Ahead, Read Ahead, Adaptive. Read Ahead will read additional
consecutive stripes. Adaptive will turn on Read Ahead for sequential reads and
turn it off for random reads.
Write policy
Write Through or Write Back. With Write Through, I/O completion for write
operations is signaled when the data is written to the disk. With Write Back, I/O
completion is signaled when the data is transferred to cache.
Cache policy
Direct I/O or Cached I/O. Choose Direct I/O for unchecked read and write
operations. Choose Cached I/O to cache all write operations and check the
cache first for read operations.
Configuring RAID Arrays
Only unconfigured good disks can be used for RAID configuration. Disks that are already part of RAID
are not available for RAID configuration.
To create custom or multiple RAID arrays, follow these steps:
Step 1
Click Server Configuration in the left navigation pane and then click RAID configuration.
The RAID Configuration page displays with the list of physical disks and logical disks.
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Step 2
Click the Configure RAID icon on the top-right of the page.
The RAID Configuration page appears.
Step 3
From the RAID level drop-down list, select one of the following RAID levels:
•
Automatic Setup without Redundancy, page 8-4
•
Automatic Setup with Redundancy, page 8-5
Note
Step 4
The automatic setup with or without redundancy overrides all the existing RAID arrays.
•
Single-Level RAID Configuration, page 8-5
•
Nested RAID Configuration, page 8-6
Click Create Array.
Note
The Create Array button is enabled only if the minimum required number of drive groups are
created.
A progress bar is displayed and then a RAID Configuration dialog box appears depicting the completion
of a RAID configuration.
Step 5
Click OK.
The RAID Configuration page appears. You can view the following:
•
The drive group information is displayed in the Logical Disks table.
•
The physical disks information is displayed in the Physical Disks table.
•
The status of the physical disks that are part of the drive group changes to Online and the status of
the backup physical disk changes to Hot spare.
Automatic Setup without Redundancy
Automatic setup without redundancy requires one or more hard drives. UCS-SCU creates RAID 0 with
this option.
Table 8-3 shows the default values that are displayed for automatic setup without redundancy.
Table 8-3
Default Values for Automatic Setup without Redundancy
Parameters
Values
Controller
MegaRAID SAS <family>
RAID Level
0
Stripe Size
64
Read Policy
No Read Ahead
Writer Policy
Write Back
Cache Policy
Direct IO
Size (MB)
Depends on the physical disk size
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Note
The common parameters, except for total size, are the default values for the controller.
Automatic Setup with Redundancy
Automatic setup with redundancy is the default RAID configuration option. This configuration requires
at least two physical drives to be available. If two physical disks are not available, the default RAID
configuration would be automatic setup without redundancy.
Table 8-4 shows the default values that are displays.
Table 8-4
Note
Default Values for Automatic Setup with Redundancy
Parameters
Values
Controller
MegaRAID SAS <family>
RAID Level
1
Stripe Size
64
Read Policy
No Read Ahead
Writer Policy
Write Back
Cache Policy
Direct IO
Size (MB)
Depends on the size of the logical disk
The common parameters, except for total size, are the default values for the controller.
Single-Level RAID Configuration
To configure single level RAID, follow these steps:
Step 1
From the RAID drop-down list, select a RAID level (0 or 1 or 5 or 6).
The Drive Groups pane appears with a list of physical disks and drive groups. For more information
about a physical disk, hover the cursor over the physical disk until the tooltip is displayed.
Step 2
From the Physical Disks list, select the physical disks that you want to include in the Drive Groups list.
Table 8-5 displays the minimum number of physical disks required for each of the RAID levels.
Table 8-5
Step 3
Minimum Number of Required Physical Drives
RAID Level
Number of Physical Disks Required
RAID 0
1
RAID 1
2
RAID 5
3
RAID 6
4
Click Create Drive Group.
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Note
The Create Drive Group button remains disabled until the minimum number of physical disks
for a RAID level is selected.
The selected physical disks are included in the Drive Groups list.
Note
The Delete Drive Group button remains disabled until a drive group is created.
Step 4
From the Physical Disks list, choose a drive to be a hot spare drive or a standby drive.
Step 5
From the Stripe Size list, choose a stripe size for the RAID level.
Step 6
From the Read Policy list, choose a read policy for the RAID level.
Step 7
From the Write Policy list, choose a write policy for the RAID level.
Step 8
From the Cache Policy list, choose a cache policy for the RAID level.
Step 9
In the Size (MB) text field, enter the size of the logical disk in MB.
Nested RAID Configuration
Nested RAID levels have primary and secondary RAID levels. You need to create a minimum of two
drive groups in nested RAID levels and the drive groups should have the same number of physical disks.
To configure nested RAID levels, follow these steps:
Step 1
From the RAID drop-down list, select a nested RAID level.
The Drive Groups pane appears with a list of physical disks and drive groups. For more information
about a physical disk, hover the cursor over the physical disk until the tooltip is displayed.
Step 2
From the Physical Disks list, select the physical disks that you want to include in the Drive Groups list.
Table 8-6 displays the minimum number of physical disks and data groups required.
Table 8-6
Step 3
Minimum Number of Required Physical Drives and Data Groups
RAID Level
Minimum Number of Physical Disks
Minimum Number of Data Groups
RAID 10
4
2
RAID 50
6
2
RAID 60
8
2
Click Create Drive Group.
Note
The Create Drive Group button remains disabled until the minimum number of physical disks
for a RAID level is selected.
The selected physical disks are included in the Drive Groups list.
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Note
The Delete Drive Group button remains disabled until a drive group is created.
Step 4
From the Stripe Size list, choose a stripe size for the RAID level.
Step 5
From the Read Policy list, choose a read policy for the RAID level.
Step 6
From the Write Policy list, choose a write policy for the RAID level.
Step 7
From the Cache Policy list, choose a cache policy for the RAID level.
Step 8
In the Size (MB) text field, enter the size of the logical disk in MB.
Clearing RAID Arrays
You can use the RAID Configuration page to delete all the created virtual disks or specific disks to free
up the disk space.
This section contains the following topics:
•
Deleting All the Virtual Disks, page 8-7
•
Deleting Single or Multiple Disks, page 8-7
Deleting All the Virtual Disks
To clear up all the disks, follow these steps:
Step 1
Click Server Configuration in the left navigation pane and then click RAID configuration.
The RAID Configuration page displays with the list of physical disks and logical disks.
Step 2
Click the Clear Configuration icon on the top-right of the page.
The RAID Configuration dialog box appears.
Step 3
Click Yes to confirm the operation.
All the virtual disks under Logical Disks are cleared and the state of the hard disks change to
Unconfigured Good.
Deleting Single or Multiple Disks
In single RAID levels and nested RAID levels, if the number of unconfigured good physical disks is less
than the minimum disks required for the selected RAID level, a RAID Configuration dialog box appears
specifying that logical disks need to be deleted to free up the physical disks.
To clear up the logical disks, follow these steps:
Step 1
Click Yes in the RAID Configuration dialog box that appears.
A Delete Logical Disks dialog box appears.
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Step 2
Select the logical disk to be deleted. The physical disks that are part of the logical disk is displayed at
the bottom of the dialog box.
Note
Step 3
If you delete a logical disk, all the information stored in the disk will be inaccessible.
Click Delete.
RAID Controllers
This section describes the UCS-SCU supported RAID Controllers and contains the following topics:
•
About LSI Embedded MegaRAID, page 8-8
About LSI Embedded MegaRAID
UCS-SCU provides support for the LSI Embedded MegaRAID controller. The controller software
supports up to eight SAS or SATA ports, depending on the hardware platform. This provides a
cost-effective way to achieve higher transfer rates and reliability.
This section contains the following topics:
•
Supported Platforms, page 8-8
•
Supported RAID Options, page 8-8
•
Enabling LSI Embedded MegaRAID, page 8-9
Supported Platforms
The LSI Embedded MegaRAID is supported on the following platforms:
•
UCS-C220 M3
•
UCS-C240 M3 (in the 16 HDD configuration)
Supported RAID Options
When you are using the LSI Embedded MegaRAID controller, you can use the following RAID options:
•
Automatic setup without redundancy
•
RAID 0
•
RAID 1
•
RAID 5 - you need to install a key, like the LSI TSOC Raid key to enable this level
•
RAID 10
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Table 8-7 shows the default values that are displayed for automatic setup without redundancy for LSI
Embedded MegaRAID.
Table 8-7
Default Values for Automatic Setup without Redundancy
Parameters
Values
Controller
LSI Embedded MegaRAID
RAID Level
0
Stripe Size
64
Read Policy
Read Ahead
Writer Policy
Write Through
Cache Policy
Direct IO
Size (MB)
Depends on the physical disk size
Enabling LSI Embedded MegaRAID
The support for the LSI Embedded MegaRAID controller is disabled by default in the BIOS.
To enable the controller in the BIOS, follow these steps:
Step 1
Reboot the server and press F2 when prompted to enter the BIOS Setup utility.
Step 2
Select the Advanced tab, then South Bridge.
Step 3
Set Onboard SCU Storage Support to Enabled.
Step 4
Press F10 to save your changes and exit the utility.
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