SCSI or DLT drive pb ?

[NAEL]

Hello,

I have a problem with an hp9000 HPUX 11.00. since yesterday.

I'm using omniback and even if the backup are going fine, I can't restore anything (I/O error on /dev/rmt/0m).
So, I tried with several DLT tape and when I directly tar files, the process is going fine (No errors and everything seems to be written on the DLT). But if I try to read the DLT, I have the following error in my syslog :

vmunix: SCSI: Unexpected Disconnect -- lbolt: 597289, dev: cd043000, io_id: 4000f23

and I can't read anything. I find strange that the pb occurs only when I read DLT, not when I wrote on them. Do you think it's an SCSI pb or is the DLT drive KO ?

I rebooted the server and verified the cables but it didn't changed anything. :(
And the drive is alone on the SCSI link.

Txs for your help

P.S. This thread has been moved from General to Tape Libraries and Drives. - Hp Forum Moderator

[Bernhard Mueller]

Hi,

if you can reproduce the problem and it always happens only when you read, not when you write to the tape, I would assume it has to be the drive. Especially since you say you verified the cable (and connectors and terminator I guess).

Regards,
Bernhard

[Michael Steele_2]

Might be a bad tape. Does this happen for every tape?

a) The 'lbolt' is the number of clock ticks since the last boot.

b) What is the device, c4t3d0?
# ioscan -fnkC disk

c) Please attach LOGTOOL report:

# STM > TOOLS > UTILITY > RUN > LOGTOOL > FILE > VIEW > RAW SUMMARY.

d) You can increase the timeout and the queue depth:

pvchange -t 60 /dev/rdsk/c4t3d0

scsictl -m queue_depth /dev/rdsk/c4t3d0

[Elmar P. Kolkman]

Have you tried using the tapedrive from the unix command prompt? For instance using commands like tar?

[NAEL]

OK, txs for your help.

It's always the same problem wathever the tape inside, and same pb occurs with tar.


I try the ioscan and so on monday and let you know the result.

Eric

[NAEL]

This is this device :
#ioscan -fnkC tape
Class I H/W Path Driver S/W State H/W Type Description
=====================================================================
tape 0 0/3/0/0.3.0 stape CLAIMED DEVICE QUANTUM DLT8000
/dev/rmt/0m /dev/rmt/c4t3d0BEST
/dev/rmt/0mb /dev/rmt/c4t3d0BESTb
/dev/rmt/0mn /dev/rmt/c4t3d0BESTn
/dev/rmt/0mnb /dev/rmt/c4t3d0BESTnb

and here is the logtool file :

[FrankJan Franken]

I've got the same problem once with a DDS tape drive. It turned out, the drive locked up the SCSI bus. Tape drive has been replaced, it was defective.