Hello,
Richard White wrote:
I have some interesting problems with my tape drives. The Bacula system has three
"identical" drives: they are all VXA-1 drives. One is mounted interally and two
are in a RakPak, which is connected to the external SCSI bus. The ID of the internal
drive is 4 and the external drives are 8 and 9.
When I used the default device definitions of /dev/nst0, /dev/nst1 and /dev/nst2, I got
mixed results. I complained about that in an earlier post, and "corrected" it
by changing them to /dev/st0, 1 and 2.
At this point, Bacula works, to a point. That is, the internal drive works all
the time. There is a problem with the external drives, though. I can mount and
unmount tapes and even start backups. Those backups fail, however, with this
kind of message:
18-Jul 16:51 lbackup-sd: Ready to append to end of Volume "Week_2B" at file=3.
18-Jul 16:55 lbackup-sd: GIS_Two.2005-07_18.16.51.42 Error: block.c:552 Write
error at 3:48 on device /dev/st1.
There are additional error lines which I will post if they are important.
When I try mt -f /dev/st1 rewind I get:
/dev/st1: No such device or address
When I run ./btape -c bacula-sd.conf /dev/st1 I get:
Tape block granularity is 1024 bytes.
btape: butil.c:258 Using device: "/dev/st1" for writing.
19-Jul 11:29 btape: Fatal Error at device.c:295 because:
dev.c:289 stored: unable to open device /dev/st1: ERR=No such device or address
19-Jul 11:29 btape: Fatal Error at device.c:288 because:
dev open failed: dev.c:289 stored: unable to open device /dev/st1: ERR=No such
device or address
19-Jul 11:29 btape: btape Fatal error: butil.c:167 Cannot open /dev/st1
So, there is something wrong with the way I am identifying these tape devices.
Bacula can mount, unmount and even write to them up to a point. The last two
unsuccessful backups put 592,030,570 bytes and 750,959,576 bytes on them,
respectively, before quitting. If I can just identify them correctly, I am
confident that they will work for me.
Well, basically something is seriously wrong with your system...
In your place, I'd do the following:
- Boot into singel-user mode (usually you supply S as an option on the
boot loders command line, I think)
- Verify the tape devices are recognized by your SCSI drivers - they
should show up in dmesg output, and in /proc/scsi/scsi
- Verify if your SCSI HBA needs some special options for the devices
(see /usr/src/linux/Documentation directory)
- Make sure the proper device nodes exist (should be /dev/st[0-2] and
/dev/nst[0-2] and three /dev/sg? entries). this might depend on the
setup of devfs, but I can't help you with that...)
- Check the tape drives using the manufacturers test program.
- Check the cabling, especially cable length and termination.
- Check the drives with an unused tape and using dd or tar to fill a
tape and measure the speed. Depending on compression and the data you
use, you should get results you can compare to the drive specs. Do this
one drive at a time.
- Use btape to check the drive access using baculas methods, again one
drive at a time.
- Restart the computer and verify the drives show up again in
/proc/scsi/scsi
- Always watch he system log for SCSI errors, SCSI driver messages or st
driver messages.
Especially if the drives can't be accessed under their "names" like
/dev/nst2 there is something broken... might be a case for your system
integrator or hardware service, after all...
Arno
Tks n rgds,
Richard White CNE6
Network Engineer
Mason County, Washington
360-427-5501
[EMAIL PROTECTED]
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IT-Service Lehmann [EMAIL PROTECTED]
Arno Lehmann http://www.its-lehmann.de
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