You need to determine if it's one or all media servers having a problem
with dismounts.
The most common cause of unload failures is device mapping mismatch
(when ACS address e.g. 0,0,10,0 does not map to the correct
/dev/rmt/xcbn device name).

If logging is increased on ACSLS side, you will be able to see all
mount/dismount requests in acsss_stats.log. 
If you have VERBOSE entry in vm.conf on all media servers, you will be
able to see the NBU part of Media Manager comms as well in
/var/adm/messages.

Regards

M.

-----Original Message-----
From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of mdmiles
Sent: 12 November 2009 18:47
To: VERITAS-BU AT MAILMAN.ENG.AUBURN DOT EDU
Subject: [Veritas-bu] ACS status = 29


We are a Netbackup 6.5.3  on Solaris 10 (master and media servers) shop.
Frequently, we have errors dismounting tapes.   /var/adm/messages says
"ACS status = 29 STATUS_DRIVE_IN_USE.   The ACSLS  (7.3.0)  (SL8500) log
reports 2009-11-08 08:59:03 DISMOUNT[0]:
971 N mt_action_dm.c 1  1272
dm_lh_drive_busy: LH error type = LH_ERR_TRANSPORT_BUSY     Netbackup
does not DOWN the drive, and subsequent MOUNT requests fail.   Any
thoughts ??   Thanks

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