SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

Upgrading a Mirrored Volume Online
You can replace online each disk in a mirrored volume (one at a time). The replacement disk can
be a higher capacity or faster speed. For example, you can replace 8-GB disks with 36-GB disks
without bringing down the entire volume.
NOTE: You can only use a smaller replacement disk if it is able to accommodate the largest used
sector address. Please note that because of fragmentation, the largest used sector address can be
much larger than the actual disk space used.
1. Verify the volume is currently mirrored and that at least one path to each disk is in the STARTED
state:
-> STATUS DISK $DATA01-*
2. If the disk contains the TMF master audit-trail, either:
• Stop TMF.
• Use the STOP, FORCED command to allow the mirror half of the TMF MAT volume to
stop while TMF is active.
3. Bring down the mirror and mirror backup paths:
-> STOP $DATA01-M
-> STOP $DATA01-MB
4. Physically remove the stopped mirror disk.
5. Install a higher-capacity or faster disk in the location where you removed the mirror disk.
6. If this is an internal disk, it powers on and immediately begins to revive if you have enabled
AUTOSTART and AUTOREVIVE for both the specific disk and for the subsystem.
7. If you do not have AUTOSTART and AUTOREVIVE enabled, start the volume and revive the
mirror disk:
-> START $DATA01
When the revive operation is complete on the mirror disk, the primary disk (with the lower
capacity) automatically enters the STOPPED state, substate HARDDOWN.
If the new disk has the same capacity but is faster, the primary disk does not automatically
stop when the revive operation is complete. Stop the slower disk and put it into the STOPPED
state, substate HARDDOWN:
-> STOP ($DATA-P, $DATA-B)
8. Physically remove the stopped primary disk.
9. Install the second higher-capacity or faster disk in the location where you removed the disk.
10. If necessary, put the disk into the STOPPED state, substate DOWN:
-> RESET $DATA01
11. Bring up the volume:
-> START $DATA01
When the revive operation finishes on the primary disk, the entire mirrored volume is available for
use.
Upgrading a Mirrored Volume Online 363