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On 09/20/2013 03:43 PM, Alan Brown wrote:
> On 20/09/13 13:22, Andreas Koch wrote:
>>
>> Many thanks for the data point! When we use Bacula (not just btape)
>> with larger block sizes (512 KB), our backups abort when bacula fails
>> to read the tape's header block.
>>
>
> Did you attempt to mix blocksizes on the same physical tape?
No. I initially tried writing with 512 KB to our existing tapes for
differentials (that were written on LTO-4 drives onto the same tapes, also
with 512 KB).
> That will not work. If you change block sizes all existing tapes holding
> data must be marked "used" and new ones labelled.
That was my second attempt: Freshly labelled tapes. All tries with 512KB
failed as described previously, only 128 KB succeeded.
As with btape, the problem with the larger block sizes did not come up
during writing, but during reading. This lead to all backups failing, since
Bacula appears to read the on-tape header block before writing the actual
backup.
> I run 2Mb block size quite happily on HP LTO5 drives and have done for a
> few years. They are capable of 16Mb - we are limited to 2Mb by Bacula.
Hmm, curiouser and curiouser! I'll wait and see whether btape gets fixed to
accept the larger block sizes and then proceed to run more tests.
Many thanks for all the feedback!
Best,
Andreas
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