DELL PowerVault MD3200i/MD3220i
Series of Storage Arrays
A Dell Technical Guide Book
Version 1.0
DELL PowerVault MD3200i/MD3220i Technical Guide Book
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June 2010
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DELL PowerVault MD3200i/MD3220i Technical Guide Book
Contents
1. Product Overview ...................................................................................................... 3
2.1 iSCSI ..................................................................................................................... 3
2.2 6Gb Serial Attached SCSI (SAS 2.0) ................................................................................ 4
3. Controller Architecture ............................................................................................... 5
3.1 MD3200i RAID Controller Module View - LEDs.................................................................... 6
4. Chassis ................................................................................................................... 8
4.1 Dimensions and Weight .............................................................................................. 8
4.2 Front View and Features ............................................................................................ 9
4.3 MD3200i and MD3220i Rear View ................................................................................. 12
4.4 Power Supply Indicator Codes .................................................................................... 13
5 Hard Drives ............................................................................................................. 14
5.1 Hard Drive Indicators .............................................................................................. 15
6. Storage Capacity Expansion ........................................................................................ 16
7. SAS Cables ............................................................................................................. 17
8. MD Storage Manager ................................................................................................. 18
8.1 MD3200i Series Storage Manager Software Packages ......................................................... 19
8.2 Enterprise Window ................................................................................................. 19
8.3 Array Window ....................................................................................................... 20
8.4 Recovery Guru ....................................................................................................... 27
9. Working with Physical and Logical Disks ......................................................................... 28
9.1 Disk Group Configuration .......................................................................................... 28
9.2 Virtual Disk Configuration ......................................................................................... 29
9.3 Configuration Metadata ........................................................................................... 29
9.4 Global Hot Spares ................................................................................................... 30
9.5 Storage Partitioning ................................................................................................ 30
9.6 Snapshot .............................................................................................................. 31
9.7 Virtual Disk Copy .................................................................................................... 31
9.8 Online Administration .............................................................................................. 32
9.9 iSCSI Support ........................................................................................................ 33
9.10 Host Operating System Support ................................................................................. 33
10 Environmental ........................................................................................................ 33
10.1 Power Supply Specs ............................................................................................... 33
10.2 Thermal management ............................................................................................ 34
10.3 Over-Temperature Shutdown ................................................................................... 34
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DELL PowerVault MD3200i/MD3220i Technical Guide Book
10.4 Environmental Specifications ................................................................................... 35
11. Configuration Guidelines .......................................................................................... 36
11.1 General Configuration Rules .................................................................................... 36
Tables
Table 1.
Selected Controller Features: ............................................................................. 7
Table 2.
Detailed Dimensions (mm) ................................................................................. 8
Table 3.
MD3200i and MD3220i Front Panel Feature Description ............................................ 11
Table 4.
Supported Drives ........................................................................................... 14
Table 5.
Supported RAID Configurations .......................................................................... 29
Table 6.
Power Supply Specifications ............................................................................. 34
Table 7.
Environmental Specifications ............................................................................ 35
Figures
Figure 1. RAID controller architecture of the MD3200i controller. ............................................. 5
Figure 2. MD3200i RAID Controller Module View - LEDs............................................................ 6
Figure 3. MD3200i and MD3220i Dimensions ......................................................................... 8
Figure 4. MD3200i Front View and Features ......................................................................... 9
Figure 5. MD3200i Front Panel Indicators ............................................................................ 9
Figure 6. MD3220i Front View and Features ....................................................................... 10
Figure 7. MD3200i Front Panel Indicators .......................................................................... 12
Figure 8. MD3200i and MD3220i Front Bezel Feature and Indicators .......................................... 12
Figure 9. MD3200i and MD3220i Rear View ......................................................................... 12
Figure 10. Power Supply Indicator Codes ........................................................................... 12
Figure 11. Hard Drive Indicators (includes HDD and SSD) ........................................................ 15
Figure 12. Expansion and cabling .................................................................................... 16
Figure 13. Mini-SAS Cable Transition ................................................................................ 17
Figure 14. MD Storage Manager: Enterprise Window ............................................................. 19
Figure 15. MD Storage Manager: Setup Tab ........................................................................ 20
Figure 16. MD Storage Manager: Array Window.................................................................... 21
Figure 17. MD Storage Manager: Logical Tab ....................................................................... 22
Figure 18. MD Storage Manager: Physical Tab ..................................................................... 23
Figure 19. MD Storage Manager: Mappings Tab .................................................................... 24
Figure 20. MD Storage Manager: Setup Tab ........................................................................ 25
Figure 21. MD Storage Manager: Access to Tasks .................................................................. 26
Figure 22. MD Storage Manager: Support Tab ...................................................................... 27
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Product Overview
The MD3200i series of storage arrays were designed with performance in mind. Each controller is
equipped with four 1Gb Ethernet ports providing total aggregated bandwidth of 800MB/s of throughput
for a dual controller system which is double the throughput of the MD3000i and most competitive
products in the entry-level iSCSI SAN array market. For small block random access applications like
databases, the MD3200i series is capable of performing over 2X the IOP performance of the MD3000i
making it a great platform for a wide variety of applications and IT environments.
When it comes to flexibility, the MD3200i series of storage arrays is second to none. There are four
base offerings to choose from allowing users to best meet their specific IT demands and budgets.
•
•
•
•
MD3200i single controller model – A single RAID controller in a 2U, 12 drive 3.5” HDD enclosure
provides the lowest cost with the highest storage capacity offering when using large near-line
SAS drives.
MD3200i dual controller model – Dual, active/active controllers in a 2U, 12 drive 3.5” HDD
enclosure provides a high availability and high capacity storage offering when using large nearline SAS drives.
MD3220i single controller model – A single RAID controller in a 2U, 24 drive 2.5” HDD enclosure
provides a low cost, high spindle count storage solution that maximizes IOPS when using SSD or
15K, 2.5” SAS drives.
MD3220i dual controller model – Dual, active/active controllers in a 2U, 24 drive 2.5” HDD
enclosure provides the combination of a highly available storage solution with a high spindle
count to maximize IOPS when using SSD or 15K, 2.5” SAS drives.
This series of arrays raises the bar for scalability in the entry-level storage space. Each model is
capable of support up to 32 physical servers when connected to one or more 1Gb Ethernet switches.
Additional storage capacity can be added up to a maximum of 96 HDD via the MD1200 and/or MD1220
enclosures. Users can also mix 3.5” and 2.5” enclosures behind their base units in order to achieve the
optimal drive tiering that best matches their application needs. Within each enclosure users can mix
SSD, SAS and near-line SAS drives maximizing their return on investment.
In addition to the above mentioned features, the MD3200i series offers optional data protection
features like snap shots and virtual disk copy services to assist users in protecting their data in a more
effective manner. Initial set up is also much easier than the previous product with the addition of
wizard enabled tools and improvements in the Modular Disk Storage Manager.
iSCSI
iSCSI (Internet Small Computer System Interface) is an industry standard that allows SCSI block I/O
protocol to be sent over the network using a TCP/IP-based protocol for establishing and managing
connections between IP-based storage devices, hosts and clients. iSCSI SAN solutions (often called IP
SANs) consist of iSCSI initiators (software driver or adapter) in the application servers, connected to
iSCSI arrays by means of standard Gigabit Ethernet switches, routers and cables.
IP SANs are enabling organizations around the globe to maximize their existing IT investments while
deploying effective and efficient networked data management solutions. iSCSI is particularly
interesting as a SAN alternative to direct-attached storage in environments where simplicity,
flexibility, price/performance and availability of administrative staff are critical IT decision factors.
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Advantages of iSCSI technology include:
• Expansive Reach
As a routable transport with no distance limitations, IP SANs can be located almost
anywhere. The reach of a SAN throughout the organization is most often limited by the
distance restriction of the interface. iSCSI removes these distance limitations to limitless
boundaries and extends its scope well beyond the corporate data center to remote locations
as well.
•
Minimal Investment
iSCSI allows businesses to control their storage expenses without completely retro-fitting
their existing network. iSCSI creates IP-based SANs which allows organizations to capitalize
on components of their existing IP infrastructure by delivering block based storage across an
IP network. Organizations do not have to invest in a new storage-only infrastructure, such as
with FC which can be costly
•
Enormous Knowledge and Experience Base
iSCSI allows almost all organizations to capitalize on existing IT skill sets to create IP-based
SANs as in-house networking expertise is standard throughout most companies today. An
end user does not have to learn a new networking protocol and go through extensive and
sometimes expensive training, such as with FC. As a mature, well-understood technology
with a broad range of proven management tools, iSCSI is easily deployed by administrators
with LAN experience.
6Gb Serial Attached SCSI (SAS 2.0)
SAS provides a scalable point-to-point topology capable of addressing storage connectivity at many
levels. As SAS enters its second generation, the standard is evolving to enable better bandwidth
utilization, easier management mechanisms, and network robustness.
6Gb/s SAS 2.0 not only doubles the current data transfer rate it provides standardized zoning, selfdiscovery, and self-configuration methods to expanders. This makes larger and more complex
topologies easier than ever to implement.
Key features of SAS 2.0
•
•
•
•
•
•
6Gb/s SAS Signaling – doubles the transfer rate from 3Gb/s to 6Gb/s
DFE (Decision Feedback Equalization) – increases cable limit to 10m ( 2 – 4 is typical)
Supports SAS mini connectors (SFF-8088 and SFF-8087)
SSC (Spread Spectrum Clocking ) – ease of design implementation – reduce peak amplitude of
radiated emissions
Supports SED (Self-Encrypting Drive) with Instant Secure Erase
Delivers 2nd generation SAS Discovery
• Standardized Zoning
• Expanded to 256 devices
• Discovery executed by SAS Expanders
• Reduces time to discover large topologies
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Controller Architecture
Figure 1.
RAID controller architecture of the MD3200i controller.
RJ
45
RJ45
RJ45
RJ45
SAS
Exp
RJ45
iSCSI TOE
PCI-E
X4
PCI-E
32-lane 8-port
PCI-E Switch
PCI-E
1Gb Eth
NIC
Flash
BBU
FPGA
Cache Offload
Assembly
NVSRAM
PCI-E
X4
PCI-E
SD
6Gb SAS
36 Port
Expander
800MHz
Power PC
I2C
Flash
DDR-II
16 Bit Parallel Bus
2GB
DDR-II
X4
(Alt Ctrl)
X24
(Drives)
X4
(Alt Ctrl)
SBB 2.0 Compliant Connector
The RAID controllers are the “engines” or the “brains” of the MD3200i and MD3220i storage arrays.
They perform the RAID calculations, control the I/O movement, communicate with the management
client, store the firmware, and protect data until it can be written safely to the hard disk drives. The
MD3200i’s architecture is designed to excel in multi-host systems environments. Its I/O system core
provides built-in hardware XOR for high-speed RAID parity calculations – enabling it to easily handle
very compute-intensive tasks. Each RAID controller contains 2GB of cache for a total of 4GB of cache
in a dual controller configuration which is mirrored with the other controller’s cache for high
availability. In the event of a power failure, the controllers are protected with battery assisted
persistent cache backup which destages cache to non-volatile media for indefinite safe keeping.
Each controller has a 36-port 6 Gb/s SAS expander that provides access to the drives in the MD3200i or
MD3220i enclosure. The SAS expanders enable each controller to access all of the drive ports creating
active/active drives loops that provide both controllers redundant access to all attached disk drives.
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Each controller has the following external connections:
•
Four 1Gb Ethernet ports for host connectivity
•
One 6 Gb/s SAS port for drive enclosure expansion for additional capacity
•
One Ethernet management ports for LAN out-of-band management
•
One PS/2 serial interface for service
Figure 2. MD3200i RAID Controller Module View - LEDs
6Gb SAS port for
drive expansion
1
Location
1
1Gb Ethernet
port for
management
1Gb Ethernet ports
for host
connectivity
2
3
4
5
LED Term
Color
Power
Green
PS/2 serial
port for
service
6
Icon
l
General Behavior
OFF = No power applied
ON = Power is applied
2
Controller Fault
Amber
OFF = The controller is operating normally
ON = The controller has defaulted
3
4
Controller Identifier
Blue
Indicates the location of the enclosure within the
system.
Cache Active
Green
OFF = No data is in cache
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Location
LED Term
Color
Icon
General Behavior
ON = Data is in cache
Battery Fault
Amber
5
6
OFF = The battery is operating normally
ON = The battery has defaulted or is missing
Password Reset Switch
N/A
A button which allows the user to reset the
default MD Storage Manager password
Table 1. Selected Controller Features:
Automated I/O path protection with host-based,
multipath failover drivers
One or more virtual disks per disk group
Automatic drive failure detection and rebuild
using a global hot spare drive
Up to 256 virtual disks
Integrated storage partitioning, snapshot and
virtual disk copy functionality
Dynamic disk group expansion
RAID levels 0, 1, 5, 6, 10
Dynamic virtual disk expansion
Greater than 2TB virtual disk size support
Dynamic RAID level migration
Smart battery allows the controller to monitor
different parameters on the cache offload
batteries such as state-of-charge and state of
health
Dynamic capacity expansion
Dynamic segment size migration
Dynamic defragmentation
Up to 30 hard disk drives per disk group in a RAID5
and RAID6 and up to 96 drives in a RAID0 or RAID1
Non-disruptive firmware upgrades
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Chassis
Dimensions and Weight
The PowerVault™ MD3200i and MD3220i enclosures use a rack mount 2U chassis.
Table 2.
Detailed Dimensions (mm)
Model Number
Xa
Xb
Y
Za
with
bezel
Za
with
bezel
Zb
Zc
Max Sys
Weight
(kg)
PV MD3200i
481.5
446.3
86.8
38.0
19.0
561.0
602.0
29.3
PV MD3220i
481.5
446.3
86.8
38.0
19.0
508.0
549.0
24.2
Figure 3. MD3200i and MD3220i Dimensions
PowerVault™ MD3200i: Weight (maximum configuration) 29.3 kg (64.6 lb)
PowerVault™ MD3220i: Weight (maximum configuration) 24.2 kg (53.4 lb)
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Figure 4. Front View and Features
MD3200i Front View and Features
Figure 5.
MD3200i Front Panel Indicators
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Figure 6.
MD3220i Front View and Features
Figure 7.
MD3200i Front Panel Indicators
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Table 3.
MD3200i and MD3220i Front Panel Feature Description
FRONT PANEL / BEZEL INDICATOR AND FETAURE DESCRIPTION
Item
1
Indicator, Button, or
Connector
Enclosure status LED
Icon
Description
The enclosure status LED lights when the enclosure
power is on.
Lights blue during normal operation and when the
management software is identifying the enclosure.
Blinks blue when the management software is identifying
the enclosure or when the system identification button is
pressed.
Lights amber when the enclosure is turned on or is reset.
Blinks amber when the enclosure is in the fault state.
5
2
Power LED
The power LED lights when at least one power supply is
supplying power to the enclosure.
3
Not Applicable
This LED has no use in the MD3200i or MD3220i.
4
System Identification
Button
The system identification button on the front control
panel can be used to locate a particular enclosure within
a rack. When the button is pushed, the system status
indicators on the control panel and the RAID controllers
blinks blue until the button is pushed again.
Hard Drives
MD3200i—Up to 12 SAS hot-swappable drives.
MD3220i—Up to 24 2.5-inch SAS hot-swappable drives.
6
Not Applicable
This switch has no use on the MD3200i or MD3220i.
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Figure 8.
MD3200i and MD3220i Front Bezel Feature and Indicators
Figure 9.
MD3200i and MD3220i Rear View
RAID Controller Module 0
RAID Controller Module 1
Power Supply / Cooling Fan Modules
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Figure 10.
Power Supply Indicator Codes
Power Indicator Description
POWER INDICATOR AND FETAURE DESCRIPTION
Item
1
Indicator, Button, or
Connector
DC Power
Icon
Description
The LED lights green when the DC output voltage is
within the limit.
If this LED is off, it indicates that the DC output voltages
are not within the limit.
2
Power supply/cooling fan
fault
The LED lights amber when the DC output voltage is not
within the limit or a fault with the fan is detected. If
this LED is off, it indicates that no fault condition is
present.
3
AC Power
The LED lights green when the AC input voltage is within
the limit.
If this LED is off, it indicates either there is no power or
the AC input voltage is not within the limit.
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Hard Drives
The MD3200i and MD3220i support SAS hot-pluggable HDDs (hard-disk drives) and SSD (solid-state
drives). MD3200i allows for both 3.5-inch and 2.5-inch form factor drives, and the MD3220i allows for
2.5-inch form factor drives. Note that 2.5” HDD in the MD3200i requires a unique drive carrier that
houses a 2.5” HDD and fits into a 3.5” HDD slot. Any combination of SAS rotational speeds and SSD
drives can be mixed within an MD3200i or MD3220i enclosure.
Table 4.
Supported Drives
Form Factor
2.5” SAS
Speed (rpm)
Capacity (GB)
7,200
500 GB
146 GB
10,000
600GB (postRTS)
HDDs up to 6Gb/s
SSDs up to 3Gb/s
300 GB
15,000
SSD
73 GB
146 GB
150 GB
500 GB
3.5” SAS
7,200
1 TB
2 TB
300 GB
HDDs up to 6Gb/s
15,000
450 GB
600 GB

SATA interface drives are not supported with the MD3200i and MD3220i.

6Gb/s SAS interface HDDs and 3Gb/s SAS interface SSDs are configured in the MD3200i and
MD3220i, from Dell’s factory

3Gb/s SAS interface HDDs are supported in the field with the supported MD3200i carrier.

The front bezel of the system contains a lock. A locked bezel secures the system hard drives.
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Hard Drive Indicators
Figure 11. Hard Drive Indicators (includes HDD and SSD)
Drive Indicator Description
Drive-Status Indicator Pattern
Condition
(RAID Only)
Blinks green two times per second
Identify drive/preparing for removal
Off
Drive ready for insertion or removal
NOTE: The drive status indicator remains off until all hard
drives are initialized after system power is turned on. Drives
are not ready for insertion or removal during this time.
Blinks green, amber, and off
Drive predicted failure
Blinks amber four times per second
Drive failed
Blinks green slowly
Drive rebuilding
Steady green
Drive online
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Drive-Status Indicator Pattern
Condition
(RAID Only)
Blinks green three seconds, amber
three seconds, and off six seconds.
Rebuild aborted
Storage Capacity Expansion
Both the MD3200i and MD3220i systems are capable of supporting up to 96 total hard drives. Adding
additional drives past what the base platforms hold is a simple matter of connecting either MD1200
and/or MD1220 JBODs to the expansion ports on the MD3200i series of arrays. Users can mix and match
the MD1200 (3.5” HDD enclosure) and the MD1220 (2.5” HDD enclosure) in any combination that
provides them the best mix of drives for their environment as long as they don’t exceed a total of 96
drive slots. The diagram below shows the proper way to cable JBODs to the MD3200i series of storage
arrays.
If using 100% MD1200 enclosures for storage expansion on an MD3200i a total of seven MD1200
enclosures can be added to achieve a total of 96 HDD. If using 100% MD1220 enclosures for expansion
on an MD3200i, a total of three MD1220 enclosures can be connected. Adding three MD1220 enclosures
provides a total of 84 HDD slots.
If using 100% MD1220 enclosures for storage expansion on an MD3220i, a total of three MD1220
enclosures can be added to achieve a total of 96 HDD. If using 100% MD1200 enclosures for expansion
on an MD3220i, a total of six MD1200 enclosures can be added to achieve a total of 96 HDD.
It is important to note that the older 3Gb SAS JBODS (MD1000 and MD1120) cannot be used as expansion
enclosures on the MD3200i or the MD3220i.
Figure 12. Expansion and cabling
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SAS Cables
The MD3200i and MD3220i arrays and the MD1200 and MD1220 JBODs standardize on the 6Gb/s (SAS 2.0)
mini-SAS cable (SFF 8088). The Mini-SAS cable is unique from the SAS cable used with the previous
MD3000i array and MD1000 JBOD.
Figure 13. Mini-SAS Cable Transition
•
Connectors on both ends of the Mini-SAS cable are universally keyed. Either end of the cable
can be connected to the MD3200i RAID controllers or JBODs.
•
To remove the Mini-SAS cable, pull the pull-tab to release the cable from the connector on the
EMM and the host system.
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MD Storage Manager
The MD Storage Manager provides the perfect combination of robustness and ease-of-use—two
attributes not commonly found together in an entry-level storage management tool. The new MD
Storage Manager graphical user interface (GUI) is ideally suited for the full-time storage administrator,
who wants complete control over their storage configuration, as well as the part-time system
administrator, who needs an intuitive interface that helps them ensure optimal storage utilization.
Features of the next generation MD Storage Manager:
•
Automated I/O path protection with host-based, multipath, failover drivers
•
Centralized management of one or more MD3200i and/or MD3220i arrays from any location
•
Backwards compatibility with MD3000 and/or MD3000i arrays
•
Integrated storage partitioning, snapshot and virtual disk copy functionality
•
o
Support for up to 32 partitions
o
Support for up to 8 snapshots per virtual disk and a total of 128 snapshots per system
o
Support for up to 8 simultaneous virtual disk copies per array and a total of 255 copies
per system.
RAID levels 0, 1, 5, 10 and 6 supported
o
Up to 30 physical disks supported per disk group (RAID levels 5 and 6)
o
Up to 96 drives in RAID level 0
o
Up to 96 drives in RAID level 1/10
•
Local key management for SDE enabled drives
•
One or more virtual disks per disk group
•
Up to 256 virtual disks (LUNs) per array
•
Dynamic capabilities support on-the-fly reconfigurations
•
o
Dynamic disk group expansion
o
Dynamic RAID level migration
o
Dynamic virtual disks expansion
o
Dynamic capacity expansion
o
Dynamic segment size migration
o
Dynamic defragmentation
o
Non-disruptive firmware upgrades
Support for unlimited hot spares
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MD3200i Series Storage Manager Software Packages
The MD3200i series Storage Manager software contains the following four packages:
•
Client – This package contains the graphical user interfaces (GUI) for monitoring and managing
the storage arrays. It also contains an optional monitor service used to send alerts when there
is a critical problem with the storage arrays.
•
Utilities – This package contains utilities like the MD Configuration Utility that greatly simplifies
the steps required to set up iSCSI connections for the storage array and the host servers. The
package also contains several providers to simplify integration with Microsoft tools (VSS and
VDS) and integration to 3rd party management tools that take advantage of SMI-S protocols.
•
Agent – This package contains software that allows a storage management station to
communicate with the controllers in the storage array over the I/O path of a host.
•
Failover Driver – This package contains the multi-path driver used to manage the I/O paths into
the controllers in the storage array. If there is a problem on the path or a failure of one of the
controllers, the driver automatically re-routes the request from the hosts to the other
controller in the storage array.
Enterprise Window
The Enterprise Window is the main window that opens when the MD Storage Manager is initially
launched. Within the Device tab, it provides a view of all of the storage arrays, including partially
managed storage arrays, in the overall management domain. It also allows for the automatic or
manual addition and removal of storage arrays and provides a view of all the MD arrays including prior
generation MD3000 and MD3000i arrays.
Figure 14. MD Storage Manager: Enterprise Window
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The Enterprise Window Setup tab is also accessible in the Enterprise Window. This Setup tab provides
quick access to common setup tasks. For example, from the Setup tab window, a user can upgrade
controller firmware, set alert notifications (email and SNMP), and perform other high-level
configuration functions.
Figure 15. MD Storage Manager: Setup Tab
There are two ways to select an array to manage from the Enterprise Window. This includes;
•
Clicking the Manage a Storage Array in the Setup tab, then select the desired storage array;
or,
•
go to the Devices tab and double-click on a storage array
Either of these two options will open the Array Window for the selected storage array.
Array Window
The Array Window provides all of the functions to configure, maintain and troubleshoot any individual
storage array. Multiple Array Windows can be open at the same time to manage multiple storage
arrays if the need to do so ever arises. The Array Window is designed to be both informative and
intuitive. From any of the six primary tabs located on the Array Window - Summary, Logical, Physical,
Mapping, Setup and Support – users can simply make changes on the fly to quickly adapt their array to
meet their needs.
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Figure 16. MD Storage Manager: Array Window
The Summary tab (shown above) provides administers with a quick look at all the pertinent
information regarding the selected MD3200i or MD3220i storage array as well as links to various
management tasks. These include:
•
A Status area which indicates whether the storage array is in an optimal state, whether there
are any long-running operations in progress with the ability to view the operations and whether
alert notifications have been set. If the array is in a non-optimal state, a link is provided to
launch the Recovery Guru. The Recovery Guru provides valuable troubleshooting assistance by
diagnosing storage array problems and determining the appropriate procedure to use for
recovery. The Recovery Guru displays a summary list of storage array problems, detailed
information about a selected problem, and recovery steps to follow for the selected problem.
•
The Capacity section provides an indication of the total capacity available on the storage array
as well as the configured and available capacity.
•
The Disk Groups &Virtual Disks area provides basic information on the number of disk groups,
virtual disks, and RAID levels used on the storage array. In addition, a link is provided to allow
the user to view additional disk group and virtual disk information in a non-embedded dialog.
•
The Hardware Components area provides basic hardware information about the selected
storage array such as the number of physical disks, media types and if there are any configured
hot spare physical disks.
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•
The Hosts & Mappings area provides information about the number of hosts, virtual disk
mappings, and storage partitions that have been configured. There is also a link provided to
allow the user to get more detailed information about the hosts and mappings by launching a
non-embedded dialog.
•
The Information Center area provides links to various help-related information and tutorials.
The Logical tab is the second tab accessible from the Array Window and contains two panes: the
Logical pane and the Properties pane.
Figure 17. MD Storage Manager: Logical Tab
The Logical pane provides a tree-structured view of the array’s disk configurations. Clicking the
plus (+) sign or the minus (-) sign adjacent to the array will expand or collapse the view. These
views under the storage array include un-configured capacity as well as configured disk groups and
their associated virtual disks. Snapshots, if any, can also be viewed from the virtual disk in which
they reside.
The Properties pane provides detailed information about the component selected in the Logical
pane. The information varies depending on what type of component is selected. Information may
include whether the component is in an optimal status, total capacity, RAID level, media and
interface type as well as controller ownership.
The physical component’s overview is provided in the Properties pane and is associated with the
logical component selected in the Logical pane. A greater detailed view can be found by right22
DELL PowerVault MD3200i/MD3220i Technical Guide Book
clicking a component, and selecting “View Associated Physical Components”. This physical view
can also be retrieved by selecting the Physical tab which will be covered next.
The Physical tab provides both a physical view of the storage array as well as detailed information
regarding the physical components. Within the Physical tab, the Physical pane appears on the left
and the Properties pane appears on the right. The Physical pane shows a graphical representation
of the physical components in the storage subsystem, such as the RAID controller modules and the
expansion enclosures while the Properties pane displays detailed information about the
component that is selected in the Physical pane.
Figure 18. MD Storage Manager: Physical Tab
The drop down menu in the Physical pane allows the user select which physical components they
would like displayed in the Properties pane.
Next, is the Mappings tab which provides an overall view of the host-to-virtual disk mappings
configured on the storage array. The Mappings window includes both a Topology pane as well as a
Defined Mappings pane.
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Figure 19. MD Storage Manager: Mappings Tab
The Topology pane shows a tree-structured view of virtual disk that are related to the storage
partitions. Click the plus (+) sign or the minus (-) sign adjacent to a node to expand or collapse the
view. Users can right-click a node to open a pop-up menu that contains the applicable actions for
that node. Views include undefined mappings within the storage array as well as the servers
connected to the storage array.
Once a virtual disk is selected, the Defined Mappings pane will provide mapping information
pertinent to that node. By clicking on the storage array for example, the virtual drives associated
with the storage array will be listed as well which hosts they are accessible by. By selecting a host,
the user can also see a list of virtual disks assigned to it.
The user can also create mappings by right-clicking on a virtual disk in the Topology pane and
selecting “Partitioning”, which allows them to create mappings via a Wizard and will quickly create
a new single partition. A user can also select “Define Additional Mappings” to define additional
mappings. This step allows the user to map the virtual disk to additional host of host groups in an
existing storage partition.
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The next tab is the Setup tab which provides access to nearly all routine administrative tasks that
a user would typically run into.
Figure 20. MD Storage Manager: Setup Tab
The Setup tab includes tasks, such as:
Blink Storage Array selection which allows the user to turn on the indicator lights of the storage
array to identify it physically.
Rename Storage Array allows for the storage array to be renamed so it can be easily identified in
the storage management software.
Set a Storage Array Password prompts the user for a new password for the storage array to
prevent unauthorized users from making configuration changes.
Configure iSCSI Host Ports provides for the configuration of network parameters for the iSCSI
ports on the RAID controller module such as IP configuration and other advanced settings.
Configure Storage Array is a key task which allows the user to create disk groups, virtual disks and
hot spare physical disks.
Map Virtual Disks option provides for the user to map virtual disks to hosts to that the virtual disk
can used for I/O operations. As mentioned previously, this can also be accomplished from the
Mappings tab.
Save Configuration selection, users can save their configuration parameters in a file to use for
restoration or replication.
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It is important to note that many tasks can also be accessed from the pull down menus across the
top;
or, by going to the Logical, Physical or Mappings tabs in the AW and right-clicking on the
appropriate object (i.e. storage array, virtual disk drive, controller, etc.). For example, rightclicking on an array provides the same options as clicking on the Setup tab or the top pull down
menus options.
Figure 21. MD Storage Manager: Access to Tasks
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The final tab is the Support tab which provides a central location when storage array recovery,
support information or a description of the storage array components are needed.
Figure 22. MD Storage Manager: Support Tab
Gather Support Information selection allows a user to save information about the storage array
(such as its profile and event log information) to a file so that it can be saved and sent it to
technical support.
Storage Array Profile provides a detailed description of all components and properties of the
storage array such as the number of physical drives used, firmware versions of the controller(s),
which components are running optimally and the number of Snapshots taken.
Download Firmware option allows the user to download RAID controller module firmware,
NVSRAM, physical disk firmware, environmental management module (EMM) firmware and EMM
configuration settings.
View Event Log will provide a detailed list of storage array events.
View Online Help is available for detailed instructions on how to accomplish any of the tasks in the
Array Window to optimally configure the storage array.
Recovery Guru
If a problem should ever arise with the array, the Recovery Guru provides valuable troubleshooting
assistance by diagnosing storage array problems and determining the appropriate procedure to use for
recovery. The Recovery Guru displays a summary list of storage array problems, detailed information
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about a selected problem, and recovery steps to follow for the selected problem.Working
with
Physical and Logical Disks
Disk Group Configuration
A disk group is a set of physical disks that the controller
logically groups together to provide one or more virtual
Disk Group A
disks to a host. Each disk group is comprised of the
same drive technology (i.e. SAS, near-line SAS or SSD)
and has an assigned RAID level. While multiple RAID
levels can be intermixed in a single MD3200i series
storage array, each disk group has a single RAID level.
The number of physical disks that make up a disk group
can be selected manually or automatically. When using
Disk
Disk
Disk
the MD Storage Manager software’s automatic
2
1
3
configuration option, disk groups will be configured
balancing the load across as many physical disk channels
and physical disk modules as possible. This ensures maximum protection and performance.
Disk
4
MD Storage Manager software also provides the ability to dynamically add additional physical disks to
existing disk groups. Existing virtual disks are then re-striped across all physical disks in the newly
expanded disk group. This takes place while the disk group and all its virtual disks remain online and
accessible for I/O.
The selection of the RAID configurations is equally critical for each application to meet the desired
data availability, performance or capacity requirements. And like physical disk types and configuration
settings, the MD3200i series of arrays support the intermixing of RAID configurations to provide
maximum flexibility and utilization. RAID 5 is generally considered the best balance of cost,
performance and reliability. The table below outlines the tradeoffs of the various supported RAID
configurations.
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Table 5.
Supported RAID Configurations
RAID-0
RAID-1 and 1+0
RAID-5
RAID-6
Physical disks operated
Physical disks operated
Data is “mirrored” independently with data
independently with data
and parity blocks
and dual parity blocks are
to another physical
disk.
distributed across all
distributed across all
physical disks in the group. physical disks in the group.
Description
Data is striped
across multiple
physical disks.
Min # of physical
disks in a disk
group
1
2
3
4
Max # of physical
disks in a disk
group
96
96
30
30
Usable capacity as
% of raw capacity
100%
50%
66.67% to 96.67%
50% to 93.33%
Application
IOPS | MB/s
IOPS
IOPS | MB/s
IOPS | MB/s
Advantages
Disadvantages
Good for reads, small IOPS, Same advantages as RAID-5
Performance due to Performance as
many concurrent IOPS and
but with better data
parallel
multiple requests
random I/Os. Parity
protection. Two hard
operation of the
can be fulfilled
utilizes small portion of
drives can fail without
access
simultaneously
raw capacity.
losing access to data.
No redundancy.
One physical disk
fails, data is lost
Storage costs are
doubled
Writes are particularly
demanding
Overhead on writes will be
slightly more demanding
than RAID-5
Virtual Disk Configuration
Disk Group A
A virtual disk is a logical structure on a
storage array for data storage. A virtual
disk is created by slicing a disk group into
a stripe set with a defined capacity. Each
Virtual Disk
disk group supports up to one or more
Marketing
virtual disks and a maximum of 256 virtual
disks per MD3200i series of storage
system. During the virtual disk creation
Disk
Disk
Disk
Disk
2
4
1
3
process, the user specifies the capacity of
the virtual disk and the virtual disk name.
Additional settings include preferred
controller ownership and a virtual disk-to-LUN mapping parameter (See Storage Partitioning section).
Configuration Metadata
MD3200i series of controllers store configuration metadata in a private 512 MB region on every
configured physical disk. This metadata area contains physical disk state and status information,
virtual disk state and status information and controller and subsystem information. The metadata on
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each physical disk stores that physical disk’s state and status, the worldwide name of its disk group,
the virtual disks it contains and the definitions for those virtual disks.
Storing metadata in this nonvolatile region provides the highest availability and enables easier
reconfigurations and migrations. As system configuration data resides on every configured physical
disk, controllers and/or multiple physical disks can be removed or swapped without losing the system
configuration. Physical disks can be relocated within the storage system to improve channel
utilization/protection or even migrated as a complete disk group into another storage system. In
instances, all configuration metadata and user data remains intact on the physical disks.
Global Hot Spares
If a physical disk fails in the MD3200i or MD3220i storage array, the controller uses redundancy data to
reconstruct the data onto a hot spare physical disk. The hot spare is automatically substituted for the
failed physical disk without requiring user intervention. Once the failed drive is replaced, the data is
then automatically copied back to the new drive. The user then has a choice of allowing the hot spare
to return to its role as a hot spare drive or become a permanent member of a disk group, therefore,
eliminating the copy back process. The replacement drive, in this case, would then be in an
unassigned state. This feature may be appealing as it reduces the degraded mode time by avoiding the
copy back process. The MD3200i and MD3220i storage arrays both support an unlimited number of
global hot spare physical disks, and each can be a spare for any like-technology disk in the array (i.e.
SAS for SAS, near-line SAS for near-line SAS and SSD for SSD). Generally speaking, the physical disks
that are assigned as a hot spares should have a capacity that is equal to or greater than the capacity of
the largest physical disk in the storage array.
Storage Partitioning
The MD3200i series of arrays Storage Partitioning feature enables a single
storage array to be logically partitioned and function as up to 32 virtual
arrays. A storage partition is a logical entity consisting of one or more
virtual disks that are accessed by a single host or shared among a collection
of hosts that are part of a host group. A storage partition is created when
one or more virtual disks are mapped to an individual host or host group.
This virtual disk-to-LUN mapping allows you to define what host or host
group will have access to a particular virtual disk in your storage system.
Hosts and host groups can only access data through assigned virtual disk-toLUN mappings. Partition access is maintained at the controller level,
ensuring complete data integrity in multi-host, multi-OS environments.
The virtual disk-to-LUN mapping implementation creates valuable flexibility
for the storage administrator as any available virtual disk can be mapped to
any attached server. So, while the individual servers see a virtual array that
consists of only their LUNs/virtual disks, the virtual disks can be intermixed
throughout the storage system within one or more disk groups.
Host A
Host B
Logical
partition
A
Logical
partition
B
LUN
LUN
LUN
LUN
LUN
The system’s logical partitioning combined with its configuration capabilities
enables administrators to choose from a range of virtual disks with different
unmapped
characteristics to meet a server's exact needs for a given application. A
virtual disk
given host can concurrently have virtual disks with different capacities,
different RAID levels, and different physical disk types. This flexibility enables hosts with different
capacity, performance or data protection demands to effectively share a single storage array.
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Snapshot
The MD3200i series of arrays Snapshot functionality provides
an additional level of data protection and the means to
improve production data utilization. Snapshot enables nonproduction servers to access an up-to-date copy of production
data for a variety of applications – including backup,
application testing, or data mining – while the production data
remains online and user-accessible.
A snapshot is a point-in-time image of a source virtual disk. It
is the logical equivalent of a complete physical copy, but is
created much more quickly and requires less disk space.
Snapshots appear and function as standard virtual disks; they
are host-addressable and can be read, written to or copied.
Snapshot
Virtual
Disk
Source
Virtual
Disk
Snapshot
Repository
Snapshot uses an innovative copy-on-write technology to
Logical
maintain the logical snapshot virtual disk while minimizing
Physical
disk utilization. When the snapshot is “taken,” the controller
suspends I/O to the source virtual disk for a few seconds while
it creates a new physical virtual disk – called the repository virtual disk – to store snapshot metadata
and copy-on-write data. When a data block on the source virtual disk is modified, a copy-on-write
occurs, copying the contents of blocks that are to be modified into the repository virtual disk for
safekeeping. This repository virtual disk combined with the original source virtual disk creates the
logical snapshot virtual disk.
Since the only data blocks that are physically stored in the repository virtual disk are those that have
changed since the time of the snapshot, the snapshot technology uses less disk space than a full
physical copy. The repository virtual disk is typically 20 percent of the base virtual disk, but will vary
depending on the amount of changes to the data. The longer a snapshot is active, the larger the
repository is needed. Virtual disk snapshot provides notification when the repository virtual disk nears a
user-specified threshold (a percentage of its full capacity). And at any time, the volume expansion
feature can be used to dynamically expand the repository virtual disk.
Virtual Disk Copy
The MD3200i series of arrays Virtual Disk Copy functionality provides administrators with another tool
to effectively manage information growth and maximize the utilization of the storage array. Virtual
disk copy creates a complete physical copy, or a clone, of a virtual disk within a storage array. The
clone virtual disk is a unique entity that can be assigned to any host and used by applications requiring
a point-in-time (PiT) copy of production data – such as backup,
application testing or development, information analysis or
data mining – without affecting the performance of the
production virtual disk.
Virtual disk copy is configured and accessed via easy-to-use
wizards. It supports up to eight concurrent copies taking place
within a single array. Virtual disk copy is a background
operation with five user-defined priority settings, enabling
administrators to minimize either copy time or the overall I/O
impact to the storage system. As virtual disk copy is controller
Base
Virtual
disk
PiT
Clone
Virtual
disk
Copy
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based, it requires no host interaction or CPU cycles – minimizing the impact to applications and the
storage infrastructure.
Virtual disk copy can be used in conjunction with virtual disk snapshot – which creates a PiT image of a
virtual disk while maintaining read / write access – enabling a complete PiT clone to be created
without interrupting the I/O activity of the production virtual disk. Additionally, virtual disk copy can
be used to redistribute data – moving virtual disks from older, slower disk physical disks to newer,
faster, or higher capacity physical disks – to optimize application performance and/or capacity
utilization.
Online Administration
The MD3200i series of storage arrays allows primary storage management tasks to be performed while
the storage remains online with complete read/write data access. This allows storage administrators
to make configuration changes, conduct maintenance, or expand the storage capacity without
disrupting I/O to its attached hosts. Online capabilities include:
•
Add Free Capacity
Capacity Expansion enables the capacity and number of physical disks to be increased for a given
disk group. Up to two physical disks at a time can be added to existing disk groups, with the
existing virtual disks then being striped across the full set of physical disks now comprising the disk
group.
•
Dynamic Expansion
This feature enables new drive modules to be added, virtual disk groups to be configured, and
virtual disks to be created without disrupting access to existing data. Once a newly created virtual
disk is defined, the array provides immediate virtual disk availability and is enable it to be instantly
mapped and accessed by a host(s).
•
Dynamic Virtual Disk Expansion
This feature allows for the capacity expansion of an existing virtual disk by using the free capacity
on an existing virtual disk group. And since dynamic virtual disk expansion concatenates (combines)
the new capacity with the original capacity, maximum performance and utilization is assured.
•
Dynamic RAID Level Migration
This level of migration changes the RAID level of a virtual group on the existing drives, without
requiring the relocation of data. With this dynamic feature, customers can easily adjust RAID levels
when their application, availability, or performance needs change.
•
Dynamic Segment Size Migration
With this feature, the segment size of a given virtual disk can be dynamically changed.
•
Dynamic Defragmentation
Dynamic defragmentation allows the user to rearrange virtual disks and consolidates free capacity
within a virtual disk group resulting in optimized access patterns for existing and newly created
volumes.
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•
Non-disruptive firmware upgrades
Enables controller firmware upgrades to occur with no interruption to data access. The new
firmware is transferred to the first controller, its flash memory is updated, and the controller is
rebooted. The firmware is then passed from the first controller to the second, and the process is
repeated. With a multi-path driver installed, access to all storage arrays’ virtual disks is
maintained throughout the process.
iSCSI Support
The MD3200i series of storage arrays support all industry-standard GbE switches and NICs. The MD3200i
series of arrays do not support 10/100 directly connected to the array with the exception being the
management port.
The free initiators that ship with the Windows and Linux operating systems are the preferred
connectivity choice for the arrays. These initiators provide ample performance for this class of array.
Host Operating System Support
The MD3200i series of storage arrays support the following operating systems:
•
Microsoft Windows 2008
•
Microsoft Windows 2003
•
Microsoft Hyper-V
•
RedHat Enterprise Linux
•
SuSE Enterprise Linux
•
VMware
•
Xen Server
Please consult with the MD3200i/MD3220i Support Matrix for a complete list of supported
configurations.
Environmental
Power Supply Specs
The PowerVault™ MD3200i and MD3220i power supply is rated at 600 W. It operates on input voltages
ranging from 100 – 240 V, auto-switching to the sensed line level.
EMC classification is Light Industry
FCC classification is Class A
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Table 6.
Power Supply Specifications
AC Characteristics
INPUT PARAMETER
Requirement
Input Voltage Range
90 – 264 VAC
Input Frequency
47 – 63 Hz
Peak Inrush Current
55 A for 10ms or less, 25 A for 10-150ms
Power Factor over full AC input range
0.9 @ output load > 90%
Minimum Efficiency measured 20%, 50% and
80% output load over full range of AC input and
environmental conditions
Must Meet Climate Savers requirements:
Load Condition
Peak Output Power
Efficiency
20%
87%
50%
90%
100%
87%
600 Watts
Thermal management
The cooling system for the enclosure is designed to allow all components (power supplies, RAID
controllers, HDDs, SSDs etc.) to meet their full operating specifications. There may be up to four fans
in each power supply/fan module. This configuration provides N+1 fan redundancy, meaning that the
enclosure can be sufficiently cooled for normal operation even if one fan fails.
Firmware shall continuously monitor the temperature sensors within the enclosure and take proper
actions to throttle the fans in order to maintain optimal operating temperature.
Over-Temperature Shutdown
In order to prevent potential damage to the drives and subsequent loss of data, the power supply has
the capability to shut itself down or be shut down by the RAID controller in the event of an overtemperature condition. When the power supply incorporates its internal thermal shutdown feature, it
will automatically restart when the over temperature condition no longer exists. Hysteresis of at least
5 degrees is employed to prevent a frequent toggling on and off of the outputs.
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Environmental Specifications
Table 7.
Environmental Specifications
Temperature
Operating
10° to 35°C (50° to 95°F) with a maximum temperature
gradation of 10°C per hour
Note: For altitudes above 2950 feet, the maximum operating
temperature is de-rated 1°F/550 ft.
Storage
-40° to 65°C (-40° to 149°F) with a maximum temperature
gradation of 20°C per hour
Relative Humidity
Operating
20% to 80% (non-condensing) with a maximum humidity
gradation of 10% per hour
Storage
5% to 95% (non-condensing) with a maximum humidity gradation
of 10% per hour
Maximum Vibration
Operating
0.25 G at 3 – 200 Hz for 15 min
Storage
0.5 at 3 – 200 Hz for 15 min
Maximum Shock
Operating
One shock pulse in the positive z axis (one pulse on each side of
the system) of 31 G for 2.6 ms in the operational orientation
Storage
Six consecutively executed shock pulses in the positive and
negative x, y, and z axes (one pulse on each side of the system)
of 71 G for up to 2 ms
Altitude
Operating
-16 to 3048 m (-50 to 10,000 ft)
Note: For altitudes above 2950 feet, the maximum operating
temperature is de-rated 1°F/550 ft.
Storage
-16 to 10,600 m (-50 to 35,000 ft)
Airborne Contaminant Level
Class
G2 or lower as defined by ISA-S71.04-1985
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Configuration Guidelines
General Configuration Rules
The MD3200i and MD3220i’s extensive configuration flexibility enables customized performance tuning,
maximum capacity utilization and the highest data protection to support application servers with vastly
different requirements. A single storage array can concurrently support multiple RAID levels (0, 1, 5,
10 and 6), multiple drive technologies (SSD, SAS and near-line SAS), multiple and various disk group
sizes, and one or more virtual disks per disk group.
Below are general configuration rules for MD3200i series of arrays.
•
Up to 8 direct attached servers with single I/O paths to a dual controller storage array
•
Up to 4 direct attached servers with redundant I/O paths to a dual controller storage array
•
Up to 32 physical hosts can be supported on a single storage system (includes both single and
dual controller models)
•
Up to 96 total drives consisting of SSD, SAS and/or near-line SAS drives per storage system
•
SSD drives are limited to a single shelf (12 drives for a MD3200i or 24 drives for a MD3220i)
•
MD1200 and/or MD1220 storage enclosures can be add to a MD3200i or MD3220i storage array
for expansion up to 96 total hard drives
•
Up to 30 hard disk drives per disk group in a RAID 5 and RAID 6
•
Up to 96 hard disk drives per disk group in a RAID1/10
•
Each disk group can be configured as RAID level 0, 1, 5, 10 or 6.
•
Disk groups with different RAID levels can coexist in a single storage system.
•
Disk groups are comprised of either SSD or SAS drives. A given disk group cannot have both SSD
and SAS drives.
•
Up to 256 virtual disks (LUNs) per storage array
•
Each virtual disk can support 8 snapshots, with a maximum of 128 snapshots per storage array.
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