Im going to have to chime in here. Although I am not getting the errors
you are, I am having bacula not recognize a labeled tape, and it
requests a new one.
I manually release, and mount the tape, and all is well after that,
usually. Lets say it happens once a week, so that 1 out of 15 loads.
Mark Nienberg wrote:
> Timo Neuvonen wrote:
>
>
>>> P.S. Why? Because I have modified the "load" command to use "btape" to
>>> read the
>>> bacula label on the volume after loading it. If it fails, then it unloads
>>> and
>>> reloads the tape and tries again. This is an attempt to automatically fix
>>> the I/O
>>> problem that happens about 10-20% of the times bacula changes a tape in
>>> the middle of
>>> a backup. Note that it is not a timing problem. It happens even after
>>> "wait_for_drive" returns ready. Obviously, when working at bconsole,
>>> there are some
>>> commands that I have to perform on tapes that have no labels, so I need a
>>> different
>>> "load" command. But don't get bogged down thinking about all this, just
>>> think about
>>> the question above, OK?
>>>
>>>
>> Could you tell something more about this problem, what hardware you have
>> etc?
>>
>> I have experienced some, possibly similar problems with Exabyte 1U 10 tape
>> autochanger. No way to reproduce the problem, but happens quite often when
>> tapes need to be changed in real work :-(
>>
>
> Yes, I have an Exabyte 1U 10 tape changer with a VXA 320 drive in it. The
> problem
> looks like this:
>
> 19-Jul 03:32 khyber-sd JobId 2235: 3305 Autochanger "load slot 6, drive 0",
> status is OK.
> 19-Jul 03:32 khyber-sd JobId 2235: 3301 Issuing autochanger "loaded? drive 0"
> command.
> 19-Jul 03:32 khyber-sd JobId 2235: 3302 Autochanger "loaded? drive 0",
> result is Slot 6.
> 19-Jul 03:32 khyber-sd JobId 2235: Error: block.c:995 Read error on fd=3 at
> file:blk
> 0:0 on device "VXA3drive" (/dev/nst0). ERR=Input/output error.
> 19-Jul 03:32 khyber-sd JobId 2235: Error: block.c:995 Read error on fd=3 at
> file:blk
> 0:0 on device "VXA3drive" (/dev/nst0). ERR=Input/output error.
>
> When I first got the changer I saw other errors too, but those were all
> related to
> timing problems with mtx-changer not waiting long enough (specifically the
> wait_for_drive subroutine). I have since resolved all of that by tweaking
> mtx-changer and the Max Changer Wait setting in the device resource. But the
> error
> above still happens. As you say, it is not reproducible. Generally I can
> use
> bconsole to unmount and then mount the tape again and it will proceed. But
> this is
> putting a strain on my Saturday mornings, since my full tape backup runs
> Friday night!
>
> Since I have never been able to find the cause of the problem I have decided
> instead
> to try to work around it as I described in my initial message. In effect, I
> want the
> mtx-changer script to do what I have to do manually (unmount and mount again).
>
> I do daily backups to disk so my tape backups only happen once a week, and
> since the
> problem doesn't happen every time it can be a month or so before I have real
> world
> results of the effectiveness of my revisions. So if you are interested in
> testing my
> script, let me know.
>
> Mark
>
>
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