Dear Frank,
Auto Eject only works on shared library (static device assignment or via
DDS)
or ACSLS based Silo libraries. In these sharing cases only, autoeject
is controlled by "Idle device timeout" setting from lib properties.
Different reasons for that behavior :
The main reason is, as networker search for appendable tape to continue
writing on,
to avoid writing on lot of tapes with low % usage.
Also, in DDS shared situation, writing on same physical device
using an alternate path requires umount/eject from device using path#1
and load/mount using path#2. Also, once mounted on path#1, other DDS
shared devices are "Disabled". So, does also impact device allocation
and causes nsrd more work to determine which dev is free or not.
So, at timeout, get out the drive ;-)
In non-shared lib, the probability of continuing writing on same volume
is much higher so it does not unmount vols, avoiding tape seeks and
unload/load physical moves.
As workaround, if you want to avoid tape to stay in drive,
you may regularly schedule a "nsrjb -u [-J <jukebox>]"
from the node having jukebox's control (eg hourly in not backup peak hours).
It will unmount and eject all idle devices at once and does not impact
writing ones.
HP's Data protector, for sample, has tape device resource management
different Networker's one and does tape load and tape unload each time job
starts/ends (job is equivalent to our groups). But HP's DP does not allow
different job to write to same tape resource at same time. So,
when job #1 is done, it ejects tape before remount it for job#2 to write.
Higher tape load/mount/read/unmount/eject cycles ...
HTH
Th
-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of Terveen, Frank
Sent: lundi 30 novembre 2009 18:36
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Auto unmount
Dear nw gurus
I use an I scalar 500 LTO 4 robot on Windows 2003
NW744
Is there a way to let networker auto unmount tapes when backup is done
met vriendelijke groeten / With kind regards
Frank Terveen
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