> Hi Heitor,
Hello Adam,
> Thanks for your reply!
>
>> > Listening to the unit the drive stops, rewinds, then starts again
>> > quite a lot, so the drop in write speed appears to be due to
>> > shoe-shining.
>>
>> For a continuous tape writing with spooling spool size should be at
>> least the same size of the tape. IMHO this is not shoe-shining, but
>> Bacula just stop writing to tape when data is being spooled.
>> Shoe-shining is when you provide a very lower writing stream for the
>> tape and it is unable to fill the tape strip in the first pass. This
>> is not the case.
>
> This also happens - at the end of the 8GB spool file Bacula stops
> writing to the tape and starts a new spool file, however this is not
> what I am having a problem with (at least not yet!)
>
> My issue is that while writing the spool file to tape, the tape stops
> and starts frequently. The spool file is 8GB, and the tape stops,
> rewinds, and restarts approximately 8-10 times during each despool
> operation. This is definitely shoe-shining, as the despool operation is
> supposed to happen in a single pass, with no stopping or rewinding
> until each despool has finished.
>
> After despooling has finished the drive is idle until the next
> despooling operation but this is expected. Because my spool file is
> 8GB, the drive should only stop writing after each 8GB of data, but it
> seems to stop more like every 1GB of data.
>
> I did not expect the drive to shoe-shine many times during the same
> despool operation. Do you have any idea why this might be happening?
Are you using the -nst device (non-rewindable) configuration on SD Archive
Device directive value?
> Cheers,
> Adam.
Regards,
--
MSc Heitor Faria
CEO Bacula LATAM
mobile1: + 1 909 655-8971
mobile2: + 55 61 98268-4220
Brasilia - Miami - New York
www.bacula.com.br
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