On 2007-03-25 01:58, Gene Heskett wrote:
> On Saturday 24 March 2007, Frank Smith wrote:
>> René Kanters wrote:
>>> Hi,
>>>
>>> I have had some problems that an overnight backup 'hung up', i.e., a
>>> level 0 dump started but never properly finished so backups from
>>> other machines did not work either. So far the problem has been with
>>> the western digital disk on my Mac amanda server, where a restart of
>>> the external disk solves the problem.
>>>
>>> I catch these problems the same day they happen, so I am wondering
>>> whether it is possible to run amdump with a configuration of dumping
>>> to a disk (using tpchanger "chg-disk") and not have amanda use the
>>> next slot, but the slot that the failed dump started on.
>>>
>>> I could not find any information on that in the man pages.
>>>
>>> Any ideas?
>> If you're sure that nothing you need was written to the 'tape', you
>> can use amrmtape and then relabel it with the same label. That
>> should make it the first tape to use on the next run.
>> I've often wondered why Amanda marks a tape as 'used' on a failed
>> backup even when nothing was written to tape.
>>
>> Frank
>
> I think, and someone is welcome to correct me, that the re-write of the
> label on the tape with the current date, and all the housekeeping that
> gets done when that is done, really should be delayed until such time as
> there really is something in the holding disk that's complete and ready
> to move to tape. As it is, I believe this bit of housekeeping is done up
> front before the error is known.
>
> This would be one improvement that could be put into amanda, and would be
> most welcome. Hint hint...
On the other hand, delaying the checks for the correct tape that is
as well writable, misses the opportunity to fall back to plan B,
the "degraded mode" dumps (incrementals to holdingdisk instead) is
something is wrong with the tape.
But we could get around it, by doing writing a dummy label, just like
for a new tape during that "write" test (just like "amcheck -w" does).
And when the first real data is to be written, rewrite that label again
with the correct one for the date.
This would keep the tape available for the next run if anything goes
wrong with getting the dumps.
--
Paul Bijnens, xplanation Technology Services Tel +32 16 397.511
Technologielaan 21 bus 2, B-3001 Leuven, BELGIUM Fax +32 16 397.512
http://www.xplanation.com/ email: Paul.Bijnens AT xplanation DOT com
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