Check the errpt.  I have a 3494 with 3590 drives, and when a drive goes
offline I often see a message in the errpt at that time with the specific
error.

> -----Original Message-----
> From: Adam Slesinger [SMTP:aslesinger AT US.BNSMC DOT COM]
> Sent: Thursday, March 11, 1999 9:04 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      Drives made unavailable - why?
>
> Hello there!
>
> I have come across a minor problem that puzzles me. We are running ADSM
> 3.1.1.5 on AIX 4.2.1 with an attached STK9730 DLT library with two
> drives.
>
> After checking the activity log this morning, I noticed that the
> scheduled admin command we set up to backup up the database ran
> successfully, but the actual backup process failed.  The reason was
> "Insufficient number of mount points."  I checked the online status of
> the drives and both said "Unavailable since 3/11/99 8:05:10"  Now,
> that's the exact time the backup database schedule takes off.  In
> addition, there were 6 "Storage Subsystem Failure" messages in the AIX
> error log.
>
> I updated the drive online status for both drives to yes and kicked off
> a db backup and it worked just fine!  I guess my question is "What in
> the world would cause both drives to suddenly become unavailable?"  Has
> anybody run into a similar problem?  The activity log doesn't tell me
> why they became unavailable, is there any place else I can check for
> more info?
>
> Thanks a lot!!!
> adam
> __________________
> Adam Slesinger
> Corporate Information Systems
> Brown & Sharpe, RI
> Phone: (401) 886-2236
> Email: aslesinger AT us.bnsmc DOT com