Hi there,

More info is needed.

* What are the messages in your activity log?
* What OS is it attached too?  If AIX, check the errpt.  If Windows check
your event viewer.
* How long do they work for after you make them available again?  Do they
break right away as soon as they use a tape, or it is specific tape(s)
causing the issue.  Bad Tapes can cause weird things to happen.
* What kind of drives are they, and what kind of library are they in?

Lots of things can cause a drive to go off-line.

-----
David N. Reiss        dreiss AT mchsi DOT com
Home: (309)/243-1504  Cell: (407)/325-7623
A paranoid is someone who has all the facts at his disposal.
                - William Burroughs


-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU]On Behalf Of
Mohsin Saleem Khan
Sent: Thursday, December 16, 2004 9:58 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Drives become unavailable


Hi,

         We have two drives define in TSM 5.1 Level 6.5, it has been
happening now from few days that every drives become unavailable quite
often, and I update them as online=yes they become available again....I am
not sure why it is happening and what should i do, to get stable drives,
any help

Regards
Mohsin