"Mark Nienberg" <gmane AT tippingmar DOT com> kirjoitti viestissä
news:g651m3$cv4$1 AT ger.gmane DOT org...
> 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,
The problems you are experiencing look very much the same that I have. I'm
very interested in testing the changes you have made into the script. I
couldn't follow from this mail thread if it included all the changes, but
can you email your script to me (or include it as an attachment to mailing
list message, I don't know if the list system will support it).
I can not promise any immediate results, since I have the same problem like
you: while testing, everything seems to work ok, but real tape changes in
the middle of the night tend to fail. Due to my environment, this happens
typically only 1-2 times a month.
Pls. also let me know what other changer-related settings you have in the
conf files, like the MaxChangerWait that you mentioned.
Regards,
Timo
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