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48 Planning: MD3600i Series Storage Array Terms and Concepts

• Segment size migration

• Disk group expansion

• Disk group defragmentation

The priority of each of these operations can be changed to address

performance requirements of the environment in which the operations are to

be executed.

NOTE: Setting a high priority level impacts storage array performance. It is not

advisable to set priority levels at the maximum level. Priority must also be assessed

in terms of impact to host server access and time to complete an operation. For

example, the longer a rebuild of a degraded virtual disk takes, the greater the risk

for secondary disk failure.

Virtual Disk Migration and Disk Roaming

Virtual disk migration is moving a virtual disk or a hot spare from one array to

another by detaching the physical disks and re-attaching them to the new

array. Disk roaming is moving a physical disk from one slot to another on the

same array.

Disk Migration

You can move virtual disks from one array to another without taking the

target array offline. However, the disk group being migrated must be offline

before your perform disk migration. If the disk group is not offline prior to

migration, the source array holding the physical and virtual disks within the

disk group marks them as missing. However, the disk groups themselves

migrate to the target array.

An array can import a virtual disk only if it is in an optimal state. You can

move virtual disks that are part of a disk group only if all members of the disk

group are being migrated. The virtual disks automatically become available

after the target array has finished importing all the disks in the disk group.

When you migrate a physical disk or a disk group from one MD3600i Series

storage array to another, the MD3600i storage array you migrate to, recognizes

any data structures and/or metadata you had in place on the migrating

MD3600i storage array. However, if you are migrating from any device other

than a MD3600i Series storage array, the MD3600i storage array does not

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Dell POWERVAULT MD3620I Manuel d'utilisateur Page 48