scsi tape problem - goes and won't come back without reboot

[T. Horsnell]

I cant suggest why this may be happening, but does it
help to fix this online if you send commands to /proc/scsi
to remove and then add-back the offending device?

See 'man proc' and look for the /proc/scsi/scsi section

I notice the man pages only show the 'add-single-device'
command, but I know that 'remove-single-device' also works
(on FC3 anyway) as I use them both for hotplugging SCSI disks.

Cheers,
Terry.



>I have a server which every so often "loses" its SCSI tape drive.
>Dumps stop working a command like "mt rewind" returns an error
>"/dev/tape: No such file or directory".
>
>The message log shows
>	Aug  3 04:56:40 mail kernel: scsi1:0:5:0: Attempting to abort cmd c1bda980: 0x0 0x0 0x0 0x0 0x0 0x0
>	Aug  3 04:56:40 mail kernel: scsi1:0:5:0: Command found on device queue
>	Aug  3 04:56:40 mail kernel: scsi: Device offlined - not ready after error recovery: host 1 channel 0 id 5 lun 0
>	Aug  3 04:56:40 mail kernel: st0: Error 20000 (sugg. bt 0x0, driver bt 0x0, host bt 0x2).
>
>If I unload and reload the st module, the message log shows
>	Aug  5 16:41:19 mail kernel: st: Version 20041025, fixed bufsize 32768, s/g segs 256
>	Aug  5 16:41:19 mail kernel: Attached scsi tape st0 at scsi1, channel 0, id 5, lun 0
>	Aug  5 16:41:19 mail kernel: st0: try direct i/o: yes (alignment 512 B), max page reachable by HBA 1048575
>
>Which looks like it's finding the drive fine.  But attempts to use
>/dev/tape (or /dev/st0) still fail.
>
>I have no other SCSI devices (my disks are on an i2o RAID card), but
>I can't remove the aic79xx module for the SCSI bus the tape is on --
>it reports "ERROR: Module aic79xx is in use" and I can't work out
>what's using it.
>
>I can fix the problem by rebooting, but it would be nicer if I didn't
>have to.
>
>Any suggestions?
>
>Danny.
>Network Administrator
>School of Medical Sciences
>University of Sydney
>
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