ADSM-L

Re: Incremental & full backups

2002-05-22 21:36:58
Subject: Re: Incremental & full backups
From: "Seay, Paul" <seay_pd AT NAPTHEON DOT COM>
Date: Wed, 22 May 2002 21:33:58 -0400
J-B,
The best description of TSM is that it is a full backup that is
incrementally updated each time you run a backup.  You can force a full
backup by using a mode=absolute in the management class copy group when ever
you want to re-backup everthing regardless.  The other alternatives are
backupsets and the selective command.  However, the key is understanding TSM
is a storage management tool that does backups and recoveries as needed.  It
is not just a backup tool.  TSM's philosophy has a business data retention
orientation.  If you have paper documents you don't just keep every 7th
revision to it, you keep them all until they have reached an expireation
based on length of time or number of back revisions.  TSM does exactly that.

The issue is the "incremental forever" misnomer that TSM gets.  First of
all, it is not incremental in the sense of any other backup product.
Secondly, it is not forever, it is based on your policies for reclaimation
and other techniques you can use.

Read some of my other responses on this subject at www.adsm.org.

Paul D. Seay, Jr.
Technical Specialist
Naptheon, INC
757-688-8180


<Prev in Thread] Current Thread [Next in Thread>