My suspicion is that value (media data expiration) is a value that can only increment. It is a convenience value that really doesn't mean anything concrete, since images expire, not media. (Well, media can expire, but for different reasons, and media expiration
will not write to it any more and has nothing to do with the images on the media.)
Any operation on the tape that involves an expiration time:
changing expiration of an image,
writing a new image, etc.,
causes the expiration of that image to be compared to the media data expiration time.
If the expiration of the image has a later time stamp than the media data expiration, then the media data expiration is set equal to the image expiration.
The media will still return to scratch once all the images have expired, during the daily "deassign empty" run.
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu [veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Infantino, Joe [JINFANTINO AT intersil DOT com]
Sent: Friday, March 08, 2013 10:41
To: veritas-bu AT mailman.eng.auburn DOT edu
Subject: [Veritas-bu] Data Expiration
I used the following command to change the retention of images from 1 year to 6 months but the
‘Data Expiration’ date shown on the media
in the GUI or when running
bpmedialist (see below for syntax)
did not change.
bpexpdate -recalculate -backupid
[name_time] -ret 6 -force
I did verify
both from the GUI (Reports -> Tape Reports -> Images On Tape, and using bpimmedia -mediaid [media_id])
that all images on the media have had their retention changed.
MCP, MCSA, Security+, ITILv3
Senior Systems Analyst
Security and Server Operations
jinfantino AT intersil DOT com