ADSM-L

Re: Difference between archive and backup?!?

1998-09-18 19:56:54
Subject: Re: Difference between archive and backup?!?
From: Eric LEWIS <eric.lewis AT CCMAIL.ADP.WISC DOT EDU>
Date: Fri, 18 Sep 1998 17:56:54 -0600
     The biggest difference is old backup versions expire after a time
     while the active backup never does.  An Archive file is not a
     "version" but a specific file with a specific retention period.  When
     that period expires, the file is gone regardless of its current status
     on the node.

     Five archives of the same unchanged file is no problem.  You get five
     files.  Five backups of an unchanged file can happen with a selective
     backup not with an incremental backup but if you only retain three
     versions via the management class you will only have three identical
     copies, thats all.  A single management class lets you specify one set
     of retention parameter settings for backups, another for archives.

     Also archives go into a different storage pool so you can have
     off-site copies of a node's archive files but only onsite copies of
     the node's backups.

Eric Lewis

______________________________ Reply Separator _________________________________
Subject: Difference between archive and backup?!?
Author:  "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>  at IPNET
Date:    9/18/98 7:31 AM


Hi folks!

I know that this sounds stupid - but I've never really endulged myself into the
intricacies of the ADSM Archive process. What exactly is Archiving - and how
does it differ from storing several versions of backup files and later
migrating these into long-term tape storage pools, using policy and management
classes?



Regards,
Henning Kilset Pedersen
IBM Global Services/Managed Operations IBM Account
Phone : +47-66815776      email : pedershk AT no.ibm DOT com
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