ADSM-L

Re: backup stgpool

2005-09-08 12:02:41
Subject: Re: backup stgpool
From: Andrew Raibeck <storman AT US.IBM DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Thu, 8 Sep 2005 09:01:48 -0700
> Ok..i have to have two copy storage pools both having a complete and
> separate set of tapes. From this i understand that everytime the
> stgpool backup is performed, there is no way to tell TSM that you
> need to take full backup of primary pool instead of incremental from
> what it did last day.

That is correct.

Why would you want to do otherwise?

Regards,

Andy

Andy Raibeck
IBM Software Group
Tivoli Storage Manager Client Development
Internal Notes e-mail: Andrew Raibeck/Tucson/IBM@IBMUS
Internet e-mail: storman AT us.ibm DOT com

The only dumb question is the one that goes unasked.
The command line is your friend.
"Good enough" is the enemy of excellence.

"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 2005-09-07
23:21:02:

> Hmmm thanks andy,
> I have changed the reuse delay to 4, that is the same as dbbackup
> expiration days.
>
> Ok..i have to have two copy storage pools both having a complete and
> separate set of tapes. From this i understand that everytime the
> stgpool backup is performed, there is no way to tell TSM that you
> need to take full backup of primary pool instead of incremental from
> what it did last day.
>
> Kind Regards
> Sandra
>
>  ---- storman AT US.IBM DOT COM wrote :
> > Hi Sandra,
> >
> > I'm sure you'll get plenty of advice and suggestions from others, but
here
> > are my "two cents":
> >
> > Once concern right off the bat is the reuse delay of zero, which puts
at
> > risk your goal of 100% restore capability of up to 4 days ago.
Instead,
> > your reuse delay should be the same as your dbbackup and plan file
> > expiration settings. Consider the case where on day 1, tape 'A'
contains
> > valid data that is expired on day 2. Tape 'A' is now empty, so it is
> > available for immediate reuse. On day 3, the tape is written over with
new
> > data. Now it is day 4, and you need to restore your database back to
day
> > 1. You restore the database back to day 1. Now you want to restore
data
> > from tape 'A' that was there on day 1... but that data no longer
exists
> > because it was written over with new data on day 3... and your 100%
> > restore capability is out the window.
> >
> > >From what you wrote, I am under the impression that you think you
need
> > multiple sets of copy storage pools to allow you to restore up to 4
days
> > ago. But this is not true. Since each copy pool is a logical mirror of
the
> > primary pools, a single copy pool is all that is necessary to restore
your
> > data up to four days ago (assuming everything else is also configured
to
> > minimally meet the four day requirement). If you want an onsite copy
pool
> > and an offsite copy pool, then have two copy pools: one that stays
onsite,
> > and another that goes offsite. You can then run BACKUP STGPOOL
multiple
> > times to back up the primary pools to each of your copy pools. If you
need
> > more onsite copy pools, you can define them and back up the storage
pools
> > to them.
> >
> > Regards,
> >
> > Andy
> >
> > Andy Raibeck
> > IBM Software Group
> > Tivoli Storage Manager Client Development
> > Internal Notes e-mail: Andrew Raibeck/Tucson/IBM@IBMUS
> > Internet e-mail: storman AT us.ibm DOT com
> >
> > The only dumb question is the one that goes unasked.
> > The command line is your friend.
> > "Good enough" is the enemy of excellence.
> >
> > "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 2005-09-07
> > 21:41:21:
> >
> > > Dear All,
> > > I am running TSM 5.2.3 on Windows 2003 with 3582 Library with 2
> > > drives. Ultrium2 tapes with 200GB space.
> > >
> > > Daily incremental backup of about 5GB.
> > >
> > > I have setup a copypool to which i backup my primary pool daily. The
> > > plan file (after running prepare) has ever increasing tapes required
> > > for primary stgpool restore.
> > >
> > > My question:
> > > Can i take full backup of stgpool daily and not the incremental on
> > > daily basis. The command refernce says it won't copy any file to
> > > copypool until the file is damaged or not available in copypool...
> > > that is sort of incremental.
> > >
> > > Purpose is to send one set of DR tapes to offsite weekly on friday.
> > > I want this set to be 100% capable of restoring my environment while
> > > at the same time, having 3 sets of DR at main site so that I can
> > > revert to a maximum of 4 days.
> > >
> > > DBbackup and plan file expiration is 4 days, and volume reuse delay
> > > in all stgpools is 0. I want to reuse the tapes immediately.
> > >
> > > Can anyone enlighten me on this.
> > >
> > > Regards,
> > > Sandra
> > >
> > >
> > >
> > >  _____________________________________________________
> > >  Sent via SUPERwebmail - Supernet web-based email service
> > >  http://www.super.net.pk/mail
> >
> >
>
>
>  _____________________________________________________
>  Sent via SUPERwebmail - Supernet web-based email service
>  http://www.super.net.pk/mail

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