APC RAID Subsystem SCSI-SATA II - Manual (Page 72)

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4.3 UDV Extension
To extend UDV size, please follow the procedures.
1. Select “/ Volume config / User data volume”.
2. Decide which UDV to be extended, click the blue square button
“ ” in the Size column next the number.
3. Change the size. The size must be larger than the original, then click
“ “ to start extension.
4. Extension starts. If UDV needs initialization, it will display an “I” in
“Status 3” and complete percentage of initialization in “R%”.
Tips
To do migration/expansion, the total size of VG must be larger
or equal to the original VG. It does not allow expanding the
same RAID level with the same hard disks of original VG.
During setting migration, if user doesn’t setup correctly,
controller will pop up warning messages. Below is the detail of
messages.
"Invalid VG ID": Source VG is invalid.
"Degrade VG not allowed": Source VG is degraded.
"Initializing/rebuilding operation's going": Source VG is
initializing or rebuilding.
"Migration operation's going": Source VG is already in
migration.
"Invalid VG raidcell parameter": Invalid configuration. E.g.,
New VG's capacity < Old VG's capacity, New VG's stripe size <
Old VG's stripe size. Or New VG's configuration == Old VG's
configuration.
"Invalid PD capacity": New VG's minimum PD capacity < Old
VG's minimum PD capacity.
Caution
VG Migration cannot be executed during rebuild or UDV
extension.