ADSM-L

Re: DB (Image) backups

2005-06-28 16:55:11
Subject: Re: DB (Image) backups
From: Tab Trepagnier <Tab.Trepagnier AT LAITRAM DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 28 Jun 2005 15:54:25 -0500
Mark,

Thanks for the info.

One thing I'm still not clear on is "what does one do with a database
image backup?"  The manuals are clear about how to create one, but less
clear on how you would use it.

Thanks again.

Tab


"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 06/28/2005
10:19:07 AM:

> From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On
> Behalf Of Tab Trepagnier
> >We are setting up SAN replication for DR.  I need some
> >information on how to handle the TSM database.
> >
> >TSM 5.1.10.0 - soon to be TSM 5.3.(2?).x.
> >AIX 5.2 ML-3 - soon to be AIX 5.3 ML-2+
> >
> >Now we have an EMC Clariion CX500 SAN and we're setting up SAN-to-SAN
> >replication with our warm site.  We will have a TSM server
> >staged at that
> >site but it will be OFFLINE because of a shortage of live
> >Fiber ports in a
> >non-DR state.  Our drop-ship contract includes an FC switch.
> >
> >What we would like to do is backup the DB - full and
> >incremental - to the
> >SAN and replicate those backups to the warm site's SAN.  Recovery would
> >involve connecting the staged recovery server to the target
> >LUN and then restore the replicated database volumes.
> >
> >Questions:
> >* Would that work??
> >* If I wanted to continue the DB backups to tape in parallel - in other
> >words, maintain two DB backup sequences - how would I do that?
> >* The Backup DB command offers a Type=Image option.  What does
> >one do with a DB image?
>
> Short answer: yes.
>
> There is a very important point with replication--if the replication
> target runs a TSM server, the TSM server process must *not* be running
> during replication.
>
> Virtually all replication technology is application-agnostic; i.e., the
> replication process doesn't care what the data looks like--it just moves
> bytes from source to target. If you replicate a TSM db to a target box,
> and the target box has a hot TSM server process running against the
> database, you'll corrupt it in a flash. If you want failover capability,
> great pain must be taken to insure that the replication link is closed
> before starting the target machine's process.
>
> If your replication technology is solid, you should be able to run a TSM
> db backup during replication.
>
> --
> Mark Stapleton (stapleton AT berbee DOT com)
> IBM Certified Advanced Deployment Professional
>   Tivoli Storage Management Solutions 2005
> IBM Certified Advanced Technical Expert (CATE) AIX
> Office 262.521.5627

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