Il 10/06/2011 12:02, James Harper ha scritto:
>> hi,
>>
>> i am running Bacula 5.0.2 on Debian Lenny amd64 with a Certance LTO2
>> streamer.
>>
>> since a while my backupjobs does not get finished, as bacula says
>>
>>
>> 10-Jun 06:54 lx01-sd JobId 2422: Despooling elapsed time = 00:00:51, Transfer
>> rate = 22.89 M Bytes/second
>> 10-Jun 06:56 lx01-sd JobId 2422: Writing spooled data to Volume. Despooling
>> 1,167,755,347 bytes ...
>> 10-Jun 06:57 lx01-sd JobId 2422: Despooling elapsed time = 00:00:48, Transfer
>> rate = 24.32 M Bytes/second
>> 10-Jun 06:58 lx01-sd JobId 2422: Writing spooled data to Volume. Despooling
>> 1,167,755,351 bytes ...
>> 10-Jun 06:59 lx01-sd JobId 2422: End of Volume "LX03DO01" at 159:2982 on
>> device "Certlto2" (/dev/nst0). Write of 64512 bytes got -1.
>> 10-Jun 06:59 lx01-sd JobId 2422: Re-read of last block succeeded.
>> 10-Jun 06:59 lx01-sd JobId 2422: End of medium on Volume "LX03DO01"
>> Bytes=158,745,581,568 Blocks=2,460,713 at 10-Jun-2011 06:59.
>>
>> LTO2 should be able to store 200GB on a media?
>>
>
> 158GB is probably a bit low. 85GB is definitely a problem. Is this something
> that has been getting worse over time? How old are the tapes?
>
> Does your tape drive vendor provide any drive assessment tools? Eg HP provide
> Library& Tape Tools.
>
> LTO is pretty smart and the heads are organised so that immediately after the
> media passes under the write head it passes under the read head and the data
> just written is read. If there is a problem reading it the data is rewritten.
> Obviously every time a block has to be rewritten the effective capacity of
> the tape is reduced. The drive assessment tools should tell you how much this
> is happening (margin, I think) and otherwise report the condition of the
> drive and the tapes.
>
> Some of our tapes are down to about 175GB capacity. Curiously it is the set
> of 5 tapes used on Fridays that are suffering from this problem which is
> strange as they are used about 5 times less than the other tapes.
>
> James
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I suggest trying a btape fill test command.
Just my 2 cents.
--
Marcello Romani
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