The data on the offsite volumes do not physically change during reclamation. The pointers to the data change in the database which is then backed up as a new db backup. There are a number of reasons to keep older database backups buts another discussion.
Rajesh > ----- Original Message ----- > From: "Lawrence Clark" <[EMAIL PROTECTED]> > To: [email protected] > Subject: Re: TSM DB backup question > Date: Thu, 6 Apr 2006 14:31:21 -0400 > > > Is the DB backup of any use after the next db backup is taken. The data > on the volumes changes, and data is expired and tapes reclaimed...so > what is the value of older db backups? > > We back up the db to disk and ftp a copy over to a remote site. > > Our backup data is kept in one tape library and the copypool in a > separate library, both at separate sites. So if our main site has a > fire, the backup data is available from the separate site. If that > backup site has a fire, the copypool in the main site can be used to > recreate the backup storage pools. > > > > >>> [EMAIL PROTECTED] 04/06/2006 2:05:53 PM >>> > For our local sites we vault daily, i.e we send copypool tapes to the > vault daily. For our remote sites since we do not any local vault > person, we have a contract with a company and the copypool tapes are > sent to the vault once a week. > The DR tapes should be sent evry day if possible else in case of a real > disaster you would lose over a weeks data if you send DR tapes once a > week. > > Rajesh > > > ----- Original Message ----- > > From: "Vats.Ashok" <[EMAIL PROTECTED]> > > To: [email protected] > > Subject: Re: TSM DB backup question > > Date: Wed, 5 Apr 2006 14:25:06 -0700 > > > > > > hi Rajesh, > > WHat do you mean by not vault daily ? We send DR tapes once a week. > > > > -----Original Message----- > > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] Behalf > Of > > Rajesh Oak > > Sent: Wednesday, April 05, 2006 2:20 PM > > To: [email protected] > > Subject: Re: [ADSM-L] TSM DB backup question > > > > > > Ashok, > > For our remote sites where we have a small library and do not vault > > everyday, we backup the database to disk. You have to be a little > > careful here because with your 161 DB database you would need a lot > > of diskspace to keep the db backup for a number of days. > > The device class has to be file and you have to make the size big > > enough when you define it. > > > > Let me know if you have any issues. > > > > Rajesh > > > > > ----- Original Message ----- > > > From: "Remeta, Mark" <[EMAIL PROTECTED]> > > > To: [email protected] > > > Subject: Re: TSM DB backup question > > > Date: Wed, 5 Apr 2006 14:05:28 -0400 > > > > > > > > > The other factor to consider is that you should have the delay > period for > > > volume reuse on your tape storage pools set equal to the length of > time you > > > keep your database backups. Depending on how often you perform > reclamation > > > of those pools, these could add up too! > > > > > > Mark > > > > > > > > > -----Original Message----- > > > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] > Behalf Of > > > Prather, Wanda > > > Sent: Wednesday, April 05, 2006 1:53 PM > > > To: [email protected] > > > Subject: Re: TSM DB backup question > > > > > > > > > The factor to decide: > > > > > > If you somehow had a TSM data base crash, or corruption in the TSM > data > > > base, how far would you be willing to restore your data base > backwards > > > in time? > > > > > > If you think you would never use that 30 day old TSM DB backup, > you > > > don't need to keep it. > > > I think a DB retention of 5-10 days is more common. > > > > > > And no, you can't put the TSM DB backups in a storage pool. > > > > > > > > > -----Original Message----- > > > From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On > Behalf Of > > > Vats.Ashok > > > Sent: Wednesday, April 05, 2006 1:39 PM > > > To: [email protected] > > > Subject: Re: TSM DB backup question > > > > > > > > > Hi List, > > > We have tsm 5.3.00 on AIX. We run TSM database backup which runs > once / > > > every day consumes media from scratch pool. We keep these backups > for > > > at least 30 days. consuming almost 30 *200 GB tape media. Our data > base > > > is about 161 GB so my question is can we reduce the retention time > of > > > TSM db backup to 7 days. I am not sure what are the factors which > > > decides how long we need to keep these volumes around. Also Does > anybody > > > have a storage pool defined for TSM DB backups. is it possible to > do > > > that ? > > > > > > Thanks, > > > Ashok > > > > > > Confidentiality Note: The information transmitted is intended only > for the > > > person or entity to whom or which it is addressed and may contain > > > confidential and/or privileged material. Any review, > retransmission, > > > dissemination or other use of this information by persons or > entities other > > > than the intended recipient is prohibited. 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