Let's say that we have a disk storage pool called PRD_DISK. Every night backups
run and we run a backup stgpool command for our offsite copies to a tapepool
called PRD_DR and then we initiate a migration of data from PRD_DISK to onsite
tapepool called PRD_TAPE.
When you run a backup stgpool of PRD_DISK to PRD_DR you are only backing up the
incremental and not the whole storage pool ( by whole , the equivalent data of
what is being cached ). If , for instance, we are running Oracle incremental
backups of a database where we run a full cold backup which is 420 Gb to the
storage pool PRD_DISK on a Friday and then the next few days I run an
incremental, come Wednesday, if I run a backup stgpool again I will only get
the latest incremental data restored when I do a restore stgpool. What it comes
time to restore such a database, in the past becasue we were running daily hot
backups of the database. At a DR test we would be give the DR test date and do
a restore stgpool of PRD_DISK which would contain the complete database on
disk. Then, the DBA could launch as many threads as they need to restore the
database quickly rather than having to go to tape and hogging several tape
drives to get the databse restored when we go the incremental route.
Rich
----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Mark Stapleton
Sent: Thursday, March 15, 2007 11:04 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Backing up full primary stgpool
From: ADSM: Dist Stor Manager on behalf of Richard Mochnaczewski
During DR, we would like to restore one of our primary storage pool but not
just the incremental of the last night's backup but as it looks with all its
cached data. Aside from not running a migration to tape which puts us at risk
of losing data that hasn't been backed up to tape, is there a way of achieving
this using native TSM commands ?
This question doesn't make much sense to me. Are you talking about recreating
your primary disk storage pool? There's no need for that during a DR exercise.
Are you talking about restoring your primary tape storage pool? There's no need
for that either. Your copy storage pool (the volumes of which should all be at
your DR site), can be used to rebuild lost servers, provided that the primary
tape storage pool is marked as DESTROYED once your TSM database is restored and
the TSM server is running.
--
Mark Stapleton (mark.s AT evolvingsol DOT com)
Senior consultant
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