Accusys ExaRAID GUI - Manual (Page 85)

Using the RAID GUI
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* Where “Nn” means the number of member disks in the new RAID level, “No”
means the number of member disks in the original/old RAID level, “OK” means the
migration is always possible, and “N/A” means the migration is disallowed.
2.7.4 Expanding the capacity of logical disks in a disk group
To expand the capacity of a logical disk, do the following:
1. Select Maintenance Utilities > LD Reconfiguration from the main menu.
2. Click Expand and specify the following options for an LD expansion
task.
Expanding
HDDs The controller performs disk group expansion with
specified hard disks.
RAID Level The controller performs the specified RAID level
migration.
The feasibility of migration is limited to the original
and final RAID level and the number of member
disks in the disk group. The following table defines
the rules of the number disks during the RAID
migration.
Table 2-11 Limitations of the number of member disks
Old
New
RAID 0 RAID 1 RAID 10 RAID 3/5 RAID 6
RAID 0 Nn ≥ No OK OK OK OK
RAID 1 N/A Nn > No N/A N/A N/A
RAID 10 Nn ≥ No*2 OK Nn ≥ No Nn ≥ (No-1)*2 Nn ≥ (No-2)*2
RAID 3/5 Nn ≥ No+1 OK OK Nn ≥ No OK
RAID 6 Nn ≥ No+2 OK OK Nn ≥ No+1 Nn ≥ No
Stripe Size (KB) This option must be specified when migrating from
a non-striping-based RAID level to a striping-based
RAID level.
Schedule Immediately: The task will start immediately.
Once: The task will start on the specified date and
time.
Defragment
during
migration Check this option to allow defragmentation
during migration.
DG ID/LD ID Select a DG ID and an LD ID from the drop-down
menu for expansion.
Capacity (MB) The capacity of a logical disk can be expanded if
there is a free chunk available on the disk group.