Dell PowerVault MD3000 Information Update page 7

Hot and Cold Migration
Use either of the following methods to move disk groups and virtual disks:
• Hot virtual disk migration — Disk migration with the destination storage array power turned on.
• Cold virtual disk migration — Disk migration with the destination storage array power turned off.
NOTE:
To ensure that the migrating disk groups and virtual disks are correctly recognized when the target storage
array has an existing physical disk, use hot virtual disk migration.
Moving Physical Disks to the Destination Array for Migration
When inserting drives into the destination storage array during hot virtual disk migration, wait for the
inserted physical disk to be displayed in the MD Storage Manager before inserting the next physical disk.
NOTICE:
Without the delay between drive insertions, the storage array can become unstable and manageability is
temporarily lost.
Migrating Virtual Disks from Multiple Storage Arrays into a Single Storage Array
When migrating virtual disks from multiple, different storage arrays into a single destination storage
array, move all of the physical disks from the same storage array as a set into the new destination storage
array. Ensure that all of the physical disks from a storage array are migrated to the destination storage
array before starting migration from the next storage array.
NOTE:
If the drive modules are not moved as a set to the destination storage array, the newly relocated disk groups
might not be accessible.
Migrating Virtual Disks to a Storage Array with No Existing Physical Disks
When migrating disk groups or a complete set of physical disks from a storage array to another storage
array that has no existing physical disks, turn off the destination storage array. After the destination
storage array has been turned on and has successfully recognized the newly migrated physical disks,
migration operations can continue.
NOTE:
Disk groups from multiple storage arrays should not be migrated at the same time to a storage array
that has no existing physical disks. Use cold virtual disk migration for the disk groups from one storage array.
Virtual Disk Migration and Premium Features
Before migrating disk groups and virtual disks, enable the required premium features on the destination
storage array. If a disk group is migrated from a storage array that has a premium feature enabled and the
destination array does not have the feature enabled, an Out of Compliance error message can be
generated. For specific procedures to correct the error, refer to the Recovery Guru.
Information Update
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