Accusys ExaSAN A12S2-PS - Manual (Page 90)

4. How to Use
User Guide Page 4-39
4.1.2.8.4 Migrations
Different from Expansion, which enlarges an array by adding hard drives to a fixed RAID
level, Migration changes the RAID level of an array. It allows live changes to the RAID
without the need to delete the array and rebuild. This can be useful when new drives
have been added, and a new array type needs to be created.
The number of drives required for migrations to different RAID levels varies.
Example 1:
RAID 5 (12 drives) –Migrating RAID 0 ( >11 drives)
RAID 5 (12 drives) –Migrating RAID 6 ( >13 drives)
RAID 5 (12 drives) –Migrating RAID 0+1 ( >22 drives)
Example 2:
Example 3:
Note
The capacity of an array after migration can not be smaller than
the capacity of the array before migration.
Follow the steps below to select an array to migrate. This changes the RAID level, such
as from RAID 1 to RAID 5.