Migrate unit – HP StorageWorks 1510i Modular Smart Array User Manual

Page 71

migrate unit

Description

Migrates an existing LUN from one RAID level to another. If you attempt to

move to an unsupported RAID configuration for a LUN, an error message

is displayed.

NOTE:

Before changing the RAID level or stripe size of a LUN, verify there is

available, unused space on the array. Migrating from one RAID level

to another may require additional space for parity and organizational

purposes.

Syntax

migrate unit <unit> raid_level=<raid level>

[stripe_size=<size>]

Operands

<unit>

The number (0-31) of the LUN to modify.

raid_level=<raid level>

The RAID fault-tolerance level to use. RAID levels include:
• 0 = RAID 0 (no fault tolerance)
• 1 = RAID 1 (mirroring)
• 5 = RAID 5 (distributed parity)
• 6 = RAID 6 (Advanced Data Guarding)

NOTE:

If more than one pair of drives are included in a RAID 1 array, the

data is striped across the first half of the drives in the array and then

each drive is mirrored to a drive in the remaining half of the drives for

fault tolerance. This method is referred to as RAID 1+0.

stripe_size=<size>

[Optional] The stripe size to assign (in KB). Options include:
• RAID 0 uses stripe sizes 8, 16, 32, 64, 128, and 256 (Default: 128 KB)
• RAID 1 uses stripe sizes 8, 16, 32, 64, 128, and 256 (Default: 128 KB)
• RAID 5 uses stripe sizes 8, 16, 32, and 64 (Default: 16 KB)
• RAID ADG uses stripe sizes 8, 16, 32, and 64 (Default: 16 KB)

Example
To migrate unit 0 to RAID 5 with a stripe size of 32 KB:

CLI> migrate unit 0 raid_level=5 stripe_size=32

The RAID level of Unit 0 will now be 5.

Unit 0 is being migrated.

Use “show unit 0” to monitor progress.