The SAS RAID controller supports migrating an existing
RAID 0 or 10 disk array to RAID 10 or 0, respectively. This allows
you to dynamically change the level of protection of a disk array
while preserving its existing data.
About this task
When migrating RAID 0 to RAID 10, additional disks must
be included into the RAID 10 disk array in order to provide the additional
level of protection. The number of additional disks will be equal
to the number of disks in the original RAID 0 disk array. The capacity
of the disk array will remain unchanged and the disk array remains
accessible during the migration. The disk array is not protected by
RAID 10 until the migration completes.
When migrating RAID 10
to RAID 0, no additional disks are included into the RAID 0 disk array.
The number of disks in the resulting RAID 0 disk array will be reduced
to half the number of disks in the original RAID 10 disk array. The
capacity of the disk array will remain unchanged and the disk array
remains accessible during the migration.
To migrate an existing array to a new level, complete the following steps:
Procedure
- Run the iprconfig utility by typing
iprconfig.
- Select Work with disk arrays.
- Select Migrate disk array protection.
- Select the disk array to which you want to migrate the
disk array protection level.
- Press c and use up arrow and down
arrow keys to change the protection level, and press Enter.
A screen will display similar to the
following:
+------------------------------------------------------------------------------+
| Select Protection Level |
| |
| Current RAID protection level is shown. To change |
| setting hit "c" for options menu. Highlight desired |
| option then hit Enter |
| |
| c=Change Setting |
| |
|/dev/sdf - Protection Level . . . . . . : RAID 0 |
| |
|Press Enter to Continue |
| |
|e=Exit q=Cancel |
+------------------------------------------------------------------------------+
- Optional: If more member disks are required, for example
when migrating from RAID 0 to 10, move the cursor by using the up
arrow and down arrow keys at the list of candidate disks, and press
1 to select the desired disks. When you have completed your disk selection,
press Enter.
A screen will display similar to the following
example:
+------------------------------------------------------------------------------+
| Select Disk Units for Migration |
| |
|A minimum of 2 disks must be selected. |
|A maximum of 2 disks must be selected. |
|The number of disks selected must be a multiple of 2. |
| |
|OPT Name PCI/SCSI Location Vendor Product ID Status |
|--- ------ -------------------------- -------- ---------------- --------------|
| 1 sg12 0003:00:01.0/2:0:2:0 IBM HUS151473VLS300 Active |
| 1 sg13 0003:00:01.0/2:0:3:0 IBM HUS151473VLS300 Active |
| |
|e=Exit q=Cancel t=Toggle |
+------------------------------------------------------------------------------+
- Optional: If fewer member disks are needed, for example
when migrating from RAID 10 to RAID 0, the adapter will select the
extra disks and take them out of the disk array automatically. No
user intervention is needed.
- Press Enter to confirm the RAID migration.
The
migration between different RAID levels takes anywhere from several
seconds to several hours. A progress screen displays the migration
progress. Migration progress can also be found in the Display Disk
Array Status screen and Display Hardware Status screen.