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The RAID subsystem controller redistributes the original volume set over the
original and newly added disks, using the same fault-tolerance configuration.
The unused capacity on the expand raid set can then be used to create an
additional volume sets, with a different fault tolerance setting if user need to
change.
1.4.3.4 Online RAID Level and Stripe Size Migration
User can migrate both the RAID level and stripe size of an existing volume
set, while the server is online and the volume set is in use. Online RAID level/
stripe size migration can prove helpful during performance tuning activities as
well as in the event that additional physical disks are added to the RAID
subsystem. For example, in a system using two drives in RAID level 1, you
could add capacity and retain fault tolerance by adding one drive. With the
addition of third disk, you have the option of adding this disk to your existing
RAID logical drive and migrating from RAID level 1 to 5. The result would be
parity fault tolerance and double the available capacity without taking the sys-
tem off.
Introduction
1-16
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