Re: [Bacula-users] No tar for my tape drive!?!? SAS tape library help...

[Arno L. <al...@it...>]

Hi,

31.10.2008 20:21, Michael Kahle wrote:
>> What does `mt -f /dev/nst0 datcompression` say?
> 
>> mt -f /dev/nst0 datcompression
> mt: unknown command "datcompression"
> usage: mt [-v] [--version] [-h] [ -f device ] command [ count ]
> commands: weof, wset, eof, fsf, fsfm, bsf, bsfm, fsr, bsr, fss, bss, rewind, 
>           offline, rewoffl, eject, retension, eod, seod, seek, tell, status, 
>           erase, setblk, lock, unlock, load, compression, setdensity, 
>           drvbuffer, stwrthreshold, stoptions, stsetoptions, stclearoptions, 
>           defblksize, defdensity, defdrvbuffer, defcompression, stsetcln, 
>           sttimeout, stlongtimeout, densities, setpartition, mkpartition, 
>           partseek, asf, stshowopt.
> 
> So I tried:
>> mt -f /dev/nst0 compression
> /dev/nst0: Input/output error
> 
> And tried:
>> mt -f /dev/nst0 defcompression
> 
> No output there.  Here are the messages after I ran those two commands:
>> dmesg | tail
> st0: Sense Key : Aborted Command [current] 
> st0: Add. Sense: Initiator response timeout
> st0: Sense Key : Aborted Command [current] 
> st0: Add. Sense: Initiator response timeout

This looks bad... usually, you shouldn't see this sort of things... 
timeouts typically indicate something is seriously going wron on the 
SCSI bus (or, in your case, the SAS links. Might be a drive 
misconfiguration.

Have you tried if IBM has a dedicated driver for their SAS tapes? I 
know there is IBMtape available and IBM recommends it for their SCSI 
tapes (admittedly, the default linux tape drivers seem to work fine, 
too) so it might be worth trying IBMtape.

Arno

>> tail /var/log/syslog
> Oct 31 14:10:03 backup kernel: st0: Sense Key : Aborted Command [current] 
> Oct 31 14:10:03 backup kernel: st0: Add. Sense: Initiator response timeout
> Oct 31 14:10:52 backup kernel: st0: Sense Key : Aborted Command [current] 
> Oct 31 14:10:52 backup kernel: st0: Add. Sense: Initiator response timeout
> 
> 
>> Have you tried dump? 
> Yes.  This was also suggested by another person, see below:
> 
> <quote from my bacula-users post>
>>> Try
> 
>>> dd if=/dev/sda of=/dev/nst0 bs=1M count=1000
> 
> Tried it.
>> d if=/dev/sda of=/dev/nst0 bs=1M count=1000
> dd: writing `/dev/nst0': Invalid argument
> 1+0 records in
> 0+0 records out
> 0 bytes (0 B) copied, 10.048 s, 0.0 kB/s
> 
> Not sure why /dev/nst0 was invalid.  After I ran this I checked out dmesg and syslog:
> 
>> tail /var/log/syslog
> Oct 31 13:58:31 backup kernel: st0: Sense Key : Aborted Command [current] 
> Oct 31 13:58:31 backup kernel: st0: Add. Sense: Initiator response timeout
> Oct 31 13:58:31 backup kernel: st0: Can't set default compression.
> 
>> dmesg | tail
> st0: Sense Key : Aborted Command [current] 
> st0: Add. Sense: Initiator response timeout
> st0: Can't set default compression.
> </end quote>
> 
> 
>> What happens if you use /dev/st0 instead of /dev/nst0?
> 
>> tar cvf /dev/st0 .
> ./
> ./exclude
> ./logs
> ./z_backupall
> ./backup2tape.sh
> ./backupNetwork.sh
> tar: /dev/st0: Cannot write: Invalid argument
> tar: Error is not recoverable: exiting now
> 
> Syslog and dmesg after running this:
>> tail /var/log/syslog
> Oct 31 14:17:44 backup kernel: st0: Sense Key : Aborted Command [current] 
> Oct 31 14:17:44 backup kernel: st0: Add. Sense: Initiator response timeout
> Oct 31 14:17:44 backup kernel: st0: Can't set default compression.
> 
>> dmesg | tail
> st0: Add. Sense: Initiator response timeout
> st0: Can't set default compression.
> ^^^^ No dates in dmesg... so not sure if that was from the original "mt -f /dev/nst0 defcompression" that I tried.
> 
> Thanks for looking!  :)
> 
> Michael
> 
> 
> 
>       
> 
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-- 
Arno Lehmann
IT-Service Lehmann
Sandstr. 6, 49080 Osnabrück
www.its-lehmann.de