The latest update: I've solved the hardware problems, but still can't
get a good dump. (Keep your snide jokes to yourselves. :) I can
manipulate the changer just fine, loading and unloading all day long.
However, I get "Invalid argument" errors when I try to run dump:
# dump -cj -f /dev/st0 -F '/usr/local/sbin/mtx -f /dev/sg1 next' /etc
DUMP: Date of this level dump: Tue Jun 14 07:39:16 2005
DUMP: Dumping /dev/cciss/c0d0p1 (/ (dir etc)) to /dev/st0
DUMP: Label: /
DUMP: Writing 10 Kilobyte records
DUMP: Compressing output at compression level 2 (bzlib)
DUMP: mapping (Pass I) [regular files]
DUMP: mapping (Pass II) [directories]
DUMP: estimated 14613 blocks on 0.84 tape(s).
DUMP: Volume 1 started with block 1 at: Tue Jun 14 07:39:18 2005
DUMP: write error 30 blocks into volume 1: Invalid argument
DUMP: Do you want to rewrite this volume?: ("yes" or "no")
If I answer yes, it changes to the next tape and gives the same
error. If I answer "no," it aborts the dump. I tried erasing a tape
with 'mt -f /dev/st0 erase' and the process hung and wouldn't respond
to kill -9. Basically, it seems that anything that manipulates
/dev/sg1 (the library device) works, but things that manipulate
/dev/st0 (the tape drive device) don't. The status of the tape drive
seems fine, though:
# mt -f /dev/st0 status
SCSI 2 tape drive:
File number=0, block number=0, partition=0.
Tape block size 1024 bytes. Density code 0x80 (DLT 15GB uncomp. or
Ecrix).
Soft error count since last status=0
General status bits on (41010000):
BOT ONLINE IM_REP_EN
Any ideas?
Chris St. Pierre
Unix Systems Administrator
Nebraska Wesleyan University
On Thu, 9 Jun 2005, Chris St. Pierre wrote:
>It turns out the SCSI ID of the changer was in conflict with something
>else, so it wasn't detecting it. I changed the ID and it detected it,
>so that worked. Running status on the drive, though, still didn't
>work, until I read this:
>
>http://mtx.badtux.net/faq.html
>
>Apparently, 'status' is a robotic command, and can't be run on a
>drive, so it's a *good* thing it didn't work.
>
>I still haven't been able to do a successful dump, though, and now I'm
>having hardware problems with the drive. Thanks for your help. I may
>be resurrecting this thread when I get my hardware problems sorted out.
>
>Chris St. Pierre
>Unix Systems Administrator
>Nebraska Wesleyan University
>
>On Wed, 8 Jun 2005, Jay LaPrade wrote:
>
>>"That doesn't work, either. All of the mtx commands
>>give the same
>>error as `mtx -f /dev/sg0 status` (below), including
>>load."
>>
>>A few things to check for:
>>
>>1) Is the library Attached?
>>
>>dmesg | grep Attached
>>
>>This should return something like the following:
>>
>>Attached scsi tape st0 at scsi0, channel 0, id 1, lun
>>0
>>Attached scsi generic sg0 at scsi0, channel 0, id 0,
>>lun 0, type 8
>>
>>Type 8 is a library device
>>
>>2) Check your SCSI ID's
>>
>>In general I prefer to set the library to SCSI ID 0
>>and the tape drives to the next numbers, so Tape
>>Drive 1 might be SCSI ID 1
>>
>>3) Make sure you are not using luns. Last time I
>>checked RH 3 does not have multiple lun support
>>compiled into the kernel
>>
>>4) Do not have the tape library connected to a
>>MegaRAID or any other SCSI RAID adapter, Use an
>>independant SCSI card
>>
>>5) If for some reason 1) does not work, you may be
>>able to modprobe sg and that will find it. I have
>>seen cases where /etc/hotplug/scsi.agent has an
>>incorrect spelling for the MODULES name for sg. I
>>believe it was spelled MOUDLES.
>>
>>
>>
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