This discussion prompts me to ask about mirroring of primary disk storage pools.
The consultant who set up my site went for the "no-one can point a finger at me"
option and set up adsm on four AIX disks as two mirrored pairs,
One pair has the database and primary storagepool volumes used for archives, the
other has five(!) 1GB primary storagepools used for backups and the adsm log.
Consequently, when I'm backing up my main oracle application, the second pair of
disks are 100% busy. It is also wasteful of space.
I have other disk on this box which is used for application development, but
most of this is not mirrored. There is lots of space but they're all 9GB drives,
so there aren't all that many spindles. The box is its own backup server. I'm
considering placing storagepool volumes all over this.
Do other sites mirror primary disk storage pools? Is this a luxury to afford if
it is possible?
Thanks
Steve Harris
AIX/ADSM/Oracle/HACMP Guy
The Wesley Hospital, Brisbane Australia
Richard Sims <rbs AT BU DOT EDU> on 16/02/2000 03:24:46
Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
cc: (bcc: Steve Harris/Wesley)
Subject: Re: Rebuilding primary stgpool
Fax to:
>I am currently evaluating the TSM 3.7 product on Solaris 2.6. Assuming
>the primary disk stgpool disks failed, and one does not have any RAID
>protection, does TSM provide for rebuilding this storage pool? I am
>interested in knowing if it is so or would one have to recover the
>database after replacing the failed disk or, alternatively copy data from
>the copypool to the primary disk storage pool.
You do not have to recover the *SM database: it simply catalogs the data in
storage pools and will adapt to what happens thereafter.
If *SM did not fail with the loss of the disk, you can add its replacement to
the online system (if your OS and disk hardware so permit doing this live)
and proceed, deleting the failed volume thereafter.
If the storage pool disk was cached and written to the next stgpool level,
you have only to replace the failed disk.
If the storage pool disk data was lost and you had done a Backup Stgpool
beforehand, you can do a Restore Volume to get the data back.
If the disk was lost before the data was in some way replicated, it's gone:
mark the volume as Destroyed; do a Restore Volume to fully assure that none of
it is recoverable; Delete Volume.
Refer to the Admin Guide manual for the larger view of recovery.
Richard Sims, BU
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