HP 3000 Manuals HP 3000 Manuals
Disk repair
Disk repair is a mirrored disk operation that copies data from the good
drive to the bad drive to bring a mirrored pair to a consistent state
without interrupting applications accessing the volume set. After the
repair operation is completed, normal mirroring resumes.
The system starts repairing a disk when one of the following occurs:
Operator starts Operator issues the REPLACEMIRRVOL
repair command to start repair.
System Upon volume mount, the system checks
automatically to make sure both partner disks
starts repair contain the same information. If
partner disks do not contain the
same information, the good disk and
the bad disk are identified and the
repair begins.
All mirrored pairs on the system cannot be repaired at once. There is a
limit of six repair operations taking place at the same time. This is to
limit the performance impact of repairing on the system. The repairs are
staged, such that when one of the six repairs finishes, another begins.
NOTE If a system crash occurs and the system is restarted, the mirrored
disk system always performs a disk repair on all of the mirrored
disk partners. The repairs are staged.
Drives that are staged (awaiting repair) transition to the repair state
in order of mounting. If the maximum number of repairs is taking place,
subsequent pairs that mount and get staged are serviced in the order that
they are mounted.
NOTE Any disk pair that has one partner go DISABLED, (and has a
REPLACEMIRRVOL command issued), always begins an immediate repair
and is not staged.
You can use the VOLUTIL SHOWSET command to display volumes involved in
the repair process.
_______________________________________________________________
| |
| |
| :VOLUTIL |
| |
| Mirvutil A.00.00, (C) Hewlett-Packard Co., 1990. |
| All Rights Reserved. |
| |
| volutil:SHOWSET PROD_SET MIRROR |
| |
| Volume Name Vol Status Mirr Status Ldev Mirr ldev |
| - - - - - - - - - - - - - - - - - - - - - - - - - - |
| MEMBER1 MASTER NORMAL 30 31 |
| MEMBER1 MASTER NORMAL 31 30 |
| MEMBER2 MEMBER REPAIR-DEST 32 33 |
| MEMBER2 MEMBER REPAIR-SRCE 33 32 |
| |
_______________________________________________________________
The above screen shows that LDEV 32 (REPAIR-DEST) is being repaired by
LDEV 33 (REPAIR-SRCE). The repair process takes about twenty minutes to
complete. Programs and data residing on MEMBER2 are available while
repairs are taking place.