mkdistributedarray

Parameters

-level raid5 | raid6

(Required) Specifies the RAID level for the array that is being created. The values are:

• raid5
• raid6

-driveclass driveclass_id

(Required) Specifies the class that is being used to create the array. The driveclass_id must be a numeric value (specified with the lsdriveclass command).

-drivecount 4 - 128

(Required) Specifies the number of drives to use for the array. The minimum drive count for:

• RAID-5: 4
• RAID-6: 6

-stripewidth 3-16

(Optional) Indicates the width of a single unit of redundancy within a distributed set of drives. The value must be:

• RAID-5: 3 - 16
• RAID-6: 5 - 16

The default width for RAID-6 is 12 and the default width for RAID-5 is 9. The width plus the number of rebuild areas must be less than or equal to the drive count.

-allowsuperior

(Optional) Specifies that you can use drives that are not an exact match to the drive class used when creating the array (such as drives that use different capacity or technology). The system attempts to select the closest match to the class when satisfying the drive count. You can select higher capacity members of the same technology type before you select higher technology members.

Note: For a drive A to be considered superior to drive B, these situations must be true:

1. Drives A and B are use=candidate
2. Drives A and B are in the same I/O group.
3. Drive A's speed is equal to or greater than drive B's. Solid-state drives (SSDs) are higher speed than all hard disk drives (HDDs). For SSDs, tech_type tier0_flash is considered to have better performance than tier1_flash.
4. Drive A's capacity is equal to or greater than drive B's.
5. Drive A has a block size that is smaller than or equal to drive B.
6. Drives A and B have the same transport protocol.
7. Drives A and B are both not compressing drives or Drives A and B are both compressing drives of the same physical capacity and logical capacity.

-rebuildareas 1 | 2 | 3 | 4

(Optional) Specifies the overhead capacity that is distributed across all drives available to an array. This capacity restores data after a drive failure. The values are:

• 1
• 2
• 3
• 4

The value is 1 - 4 (inclusive) for RAID-5 and RAID-6 arrays.

The default number of rebuild areas increases as the drive count increases.

Note: The number of rebuild areas plus the stripe width must be less than or equal to the total drive count.

-rebuildareasgoal 0 | 1 | 2 | 3 | 4

(Optional) Specifies the number of rebuild areas that the array can target to keep available. If the number available in the array falls below this number, a system alert is raised.

Note: The goal value should not exceed the number of rebuild areas that are specified for the array.

The values are:

• 0
• 1
• 2
• 3
• 4

-strip 128 | 256

(Optional) Specifies the strip size in KiB for the array that is being configured. The values are 128 or 256.

Note: This command fails if 128 is specified and the size of the candidate drives is greater than 4 TB.

-name new_name_arg

(Optional) Specifies the name of the array.

-slowwritepriority latency | redundancy

(Optional) Controls array ability to complete write operations that take too long, even if it temporarily compromises redundancy.

The value can be either latency or redundancy:

• latency implies that the feature is enabled for normal I/O operations
• redundancy implies that the feature is not enabled for normal I/O operations

The default value is latency mode for existing arrays).

Important: An array can cause member drives to become unsynchronized (to preserve response time) if the value is latency. If the value is redundancy, the array cannot cause member drives to become unsynchronized (to preserve time) and I/O performance is impacted.

mdiskgrp_id | mdiskgrp_name

(Required) Indicates the MDisk array ID or name.