Show storage array auto configuration
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The show storageArray autoConfiguration command shows the default auto-configuration that the storage array creates if you run the autoConfigure storageArray command.
Supported Arrays
This command applies to any individual storage array, including the E4000, E2700, E5600, E2800, E5700, EF600 and EF300 arrays, as long as all SMcli packages are installed.
Roles
To execute this command on an E4000, E2800, E5700, EF600, or EF300 storage array, you must have the Storage Admin or Storage Monitor role.
Context
If you want to determine whether the storage array can support specific properties, enter the parameter for the properties when you run this command. You do not need to enter any parameters for this command to return configuration information.
Syntax
show storageArray autoConfiguration
[driveType=(SAS | NVMe4K)
driveMediaType=(HDD | SSD | unknown | allMedia)
raidLevel=(0 | 1 | 3 | 5 | 6)
volumeGroupWidth=numberOfDrives
volumeGroupCount=numberOfVolumeGroups
volumesPerGroupCount=numberOfVolumesPerGroup
hotSpareCount=numberOfHotspares
segmentSize=segmentSizeValue
cacheReadPrefetch=(TRUE | FALSE)
securityType=(none | capable | enabled)
secureDrives=(fips | fde)]Parameters
| Parameter | Description | ||
|---|---|---|---|
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The type of drives that you want to use for the storage array. The Valid drive types are:
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The type of drive media that you want to use for the mirror repository volume group. Valid drive media are these:
Use this parameter when you use the You must use this parameter when you have more than one type of drive media in your storage array. |
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The RAID level of the volume group that contains the drives in the storage array. Valid RAID levels are |
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The number of drives in a volume group in the storage array, which depends on the capacity of the drives. Use integer values. |
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The number of volume groups in the storage array. Use integer values. |
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The number of equal-capacity volumes per volume group. Use integer values. |
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The number of hot spares that you want in the storage array. Use integer values. |
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The amount of data (in KB) that the controller writes on a single drive in a volume before writing data on the next drive. Valid values are |
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The setting to turn on or turn off cache read prefetch. To turn off cache read prefetch, set this parameter to |
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The setting to specify the security level when creating the volume groups and all associated volumes. These settings are valid:
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The type of secure drives to use in the volume group. These settings are valid:
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Notes
If you do not specify any properties, this command returns the RAID Level 5 candidates for each drive type. If RAID Level 5 candidates are not available, this command returns candidates for RAID Level 6, RAID Level 3, RAID Level 1, or RAID Level 0. When you specify auto configuration properties, the controllers validate that the firmware can support the properties.
Drives and volume groups
A volume group is a set of drives that are logically grouped together by the controllers in the storage array. The number of drives in a volume group is a limitation of the RAID level and the controller firmware. When you create a volume group, follow these guidelines:
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Beginning with firmware version 7.10, you can create an empty volume group so that you can reserve the capacity for later use.
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You cannot mix drive types, such as SAS and Fibre Channel, within a single volume group.
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The maximum number of drives in a volume group depends on these conditions:
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The type of controller
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The RAID level
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RAID levels include: 0, 1, 10, 3, 5, and 6 .
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In a CDE3992 or a CDE3994 storage array, a volume group with RAID level 0 and a volume group with RAID level 10 can have a maximum of 112 drives.
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In a CE6998 storage array, a volume group with RAID level 0 and a volume group with RAID level 10 can have a maximum of 224 drives.
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A volume group with RAID level 3, RAID level 5, or RAID level 6 cannot have more than 30 drives.
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A volume group with RAID level 6 must have a minimum of five drives.
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If a volume group with RAID level 1 has four or more drives, the storage management software automatically converts the volume group to a RAID level 10, which is RAID level 1 + RAID level 0.
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If a volume group contains drives that have different capacities, the overall capacity of the volume group is based on the smallest capacity drive.
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To enable tray/drawer loss protection, refer to the following tables for additional criteria:
| Level | Criteria for Tray Loss Protection | Minimum number of trays required |
|---|---|---|
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The disk pool contains no more than two drives in a single tray. |
6 |
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The volume group contains no more than two drives in a single tray. |
3 |
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Each drive in the volume group is located in a separate tray. |
3 |
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Each drive in a RAID 1 pair must be located in a separate tray. |
2 |
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Cannot achieve Tray Loss Protection. |
Not applicable |
| Level | Criteria for drawer loss protection | Minimum number of drawers required |
|---|---|---|
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The pool includes drives from all five drawers and there are an equal number of drives in each drawer. A 60-drive tray can achieve Drawer Loss Protection when the disk pool contains 15, 20, 25, 30, 35, 40, 45, 50, 55, or 60 drives. |
5 |
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The volume group contains no more than two drives in a single drawer. |
3 |
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Each drive in the volume group is located in a separate drawer. |
3 |
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Each drive in a mirrored pair must be located in a separate drawer. |
2 |
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Cannot achieve Drawer Loss Protection. |
Not applicable |
Hot spares
With volume groups, a valuable strategy to protect data is to assign available drives in the storage array as hot spare drives. A hot spare is a drive, containing no data, that acts as a standby in the storage array in case a drive fails in a RAID 1, RAID 3, RAID 5, or RAID 6 volume group. The hot spare adds another level of redundancy to the storage array.
Generally, hot spare drives must have capacities that are equal to or greater than the used capacity on the drives that they are protecting. Hot spare drives must be of the same media type, the same interface type, and the same capacity as the drives that they are protecting.
If a drive fails in the storage array, the hot spare is normally substituted automatically for the failed drive without requiring your intervention. If a hot spare is available when a drive fails, the controller uses redundancy data parity to reconstruct the data onto the hot spare. Data evacuation support also allows data to be copied to a hot spare before the software marks the drive "failed."
After the failed drive is physically replaced, you can use either of the following options to restore the data:
When you have replaced the failed drive, the data from the hot spare is copied back to the replacement drive. This action is called copyback.
If you designate the hot spare drive as a permanent member of a volume group, the copyback operation is not needed.
The availability of tray loss protection and drawer loss protection for a volume group depends on the location of the drives that comprise the volume group. Tray loss protection and drawer loss protection might be lost because of a failed drive and the location of the hot spare drive. To make sure that tray loss protection and drawer loss protection are not affected, you must replace a failed drive to initiate the copyback process.
The storage array automatically selects Data Assurance (DA)-capable drives for hot spare coverage of DA-enabled volumes.
Make sure you have DA-capable drives in the storage array for hot spare coverage of DA-enabled volumes. For more information about DA-capable drives, refer to Data Assurance feature.
Secure-capable (FIPS and FDE) drives can be used as a hot spare for both secure-capable and non-secure-capable drives. Non-secure-capable drives can provide coverage for other non-secure-capable drives, and for secure-capable drives if the volume group does not have the security enabled. A FIPS volume group can only use a FIPS drive as a hot spare; however, you can use a FIPS hot spare for non-secure-capable, secure-capable, and secure-enabled volume groups.
If you do not have a hot spare, you can still replace a failed drive while the storage array is operating. If the drive is part of a RAID 1, RAID 3, RAID 5, or RAID 6 volume group, the controller uses redundancy data parity to automatically reconstruct the data onto the replacement drive. This action is called reconstruction.
Segment size
The size of a segment determines how many data blocks that the controller writes on a single drive in a volume before writing data on the next drive. Each data block stores 512 bytes of data. A data block is the smallest unit of storage. The size of a segment determines how many data blocks that it contains. For example, an 8-KB segment holds 16 data blocks. A 64-KB segment holds 128 data blocks.
When you enter a value for the segment size, the value is checked against the supported values that are provided by the controller at run time. If the value that you entered is not valid, the controller returns a list of valid values. Using a single drive for a single request leaves other drives available to simultaneously service other requests. If the volume is in an environment where a single user is transferring large units of data (such as multimedia), performance is maximized when a single data transfer request is serviced with a single data stripe. (A data stripe is the segment size that is multiplied by the number of drives in the volume group that are used for data transfers.) In this case, multiple drives are used for the same request, but each drive is accessed only once.
For optimal performance in a multiuser database or file system storage environment, set your segment size to minimize the number of drives that are required to satisfy a data transfer request.
Cache read prefetch
Cache read prefetch lets the controller copy additional data blocks into cache while the controller reads and copies data blocks that are requested by the host from the drive into cache. This action increases the chance that a future request for data can be fulfilled from cache. Cache read prefetch is important for multimedia applications that use sequential data transfers. Valid values for the cacheReadPrefetch parameter are TRUE or FALSE. The default is TRUE.
Security type
Use the securityType parameter to specify the security settings for the storage array.
Before you can set the securityType parameter to enabled, you must create a storage array security key. Use the create storageArray securityKey command to create a storage array security key. These commands are related to the security key:
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create storageArray securityKey -
export storageArray securityKey -
import storageArray securityKey -
set storageArray securityKey -
enable volumeGroup [volumeGroupName] security -
enable diskPool [diskPoolName] security
Secure drives
Secure-capable drives can be either Full Disk Encryption (FDE) drives or Federal Information Processing Standard (FIPS) drives. Use the secureDrives parameter to specify the type of secure drives to use. The values you can use are fips and fde.
Example command
show storageArray autoConfiguration securityType=capable secureDrives=fips;
Minimum firmware level
7.10 adds RAID Level 6 capability and removes hot spare limits.
7.50 adds the securityType parameter.
7.75 adds the dataAssurance parameter.
8.25 adds the secureDrives parameter.