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That's pretty much the reason but the practicle result is that you use less
media overall.
If you have a tape full of three month images and one 2-year image, that
tape can't be reused until the 2-year image is expired. Otherwise, the tape
would be reusable just three months after it's last write operation.
Imaging mixing infinite-retention images with non-infinite images - they
tapes would never be reusable.
So, whenever you mix retentions, there's always an image on that tape that's
got a longer retention that the other images. That longer-retention image
is probably going to prevent the timely reuse of that tape.
Consolidating retentions, therefore, saves tapes (in most situations).
-M
-----Original Message-----
From: Scott Jacobson [mailto:SJACOBSO AT novell DOT com]
Sent: Wednesday, March 24, 2004 11:56 AM
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Mixed Retention Levels on same media
In terms of "best utilization" of resources, the only reason I've heard
discussed why you wouldn't want mixed retention levels on the same media is
that expiration differences may be to great.
What additional reasons or why would one would not want to allow mixed
retention levels on the same media.
What are the benefits and the cons?
11:41:07.634 [5085] <2> select_media: skipping media id 000000, either FULL
or FROZE or SUSPENDED or IMPORTED
11:41:07.634 [5085] <2> select_media: skipping media id 000001, it is not
the correct retention_level
11:41:07.634 [5085] <2> select_media: skipping media id 000002, it is not
the correct retention_level
11:41:07.634 [5085] <2> select_media: skipping media id 000003, it is not
the correct retention_level
11:41:07.634 [5085] <2> select_media: selected media id 000004 for
backup[0], athena-b.provo.novell.com(rl = 7) <----------
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<DIV><SPAN class=495003519-24032004>That's pretty much the reason but the
practicle result is that you use less media overall.</SPAN></DIV>
<DIV><SPAN class=495003519-24032004></SPAN> </DIV>
<DIV><SPAN class=495003519-24032004>If you have a tape full of three month
images and one 2-year image, that tape can't be reused until the 2-year image
is
expired. Otherwise, the tape would be reusable just three months after
it's last write operation. Imaging mixing infinite-retention images with
non-infinite images - they tapes would never be reusable.</SPAN></DIV>
<DIV><SPAN class=495003519-24032004></SPAN> </DIV>
<DIV><SPAN class=495003519-24032004>So, whenever you mix retentions, there's
always an image on that tape that's got a longer retention that the other
images. That longer-retention image is probably going to prevent the
timely reuse of that tape.</SPAN></DIV>
<DIV><SPAN class=495003519-24032004></SPAN> </DIV>
<DIV><SPAN class=495003519-24032004>Consolidating retentions, therefore, saves
tapes (in most situations).</SPAN></DIV>
<DIV><SPAN class=495003519-24032004>-M</SPAN></DIV>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left>-----Original
Message-----<BR><B>From:</B> Scott Jacobson
[mailto:SJACOBSO AT novell DOT com]<BR><B>Sent:</B> Wednesday, March 24, 2004
11:56
AM<BR><B>To:</B> veritas-bu AT mailman.eng.auburn DOT edu<BR><B>Subject:</B>
[Veritas-bu] Mixed Retention Levels on same media<BR><BR></DIV>
<DIV>In terms of "best utilization" of resources, the only reason I've heard
discussed why you wouldn't want mixed retention levels on the same media is
that expiration differences may be to great.</DIV>
<DIV> </DIV>
<DIV>What additional reasons or why would one would not want to allow
mixed retention levels on the same media.</DIV>
<DIV> </DIV>
<DIV>What are the benefits and the cons?</DIV>
<DIV> </DIV>
<DIV>11:41:07.634 [5085] <2> select_media: skipping media id 000000,
either FULL or FROZE or SUSPENDED or IMPORTED<BR>11:41:07.634 [5085]
<2>
select_media: skipping media id 000001, it is not the correct
retention_level<BR>11:41:07.634 [5085] <2> select_media: skipping media
id 000002, it is not the correct retention_level<BR>11:41:07.634 [5085]
<2> select_media: skipping media id 000003, it is not the correct
retention_level<BR>11:41:07.634 [5085] <2> select_media: selected media
id 000004 for backup[0], athena-b.provo.novell.com(rl = 7)
<----------<BR></DIV></BLOCKQUOTE></BODY></HTML>
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