On Thu, Jul 5, 2012 at 11:02 AM, Jummo <jummo AT devio DOT us> wrote:
> On Thu, 5 Jul 2012, Mario Moder wrote:
>
>> Do you have any non-default values set for your tape drive (block sizes,
>> max file sizes, etc.) which could have an influence on the btape test?
>>
>
> No special settings just the dfaults.
>
>> Interesting though that you also get no more than 85 MB/s on real
>> backups. Are your 85 MB/s the despooling rate or the total backup rate?
>>
>
> It's the despooling rate.
>
> For this example backup (a file server) bacula wrote 1.9 TByte of data to the 
> first tape, so compression seems to work.
>
>

You may have to play with increasing the block sizes. The default of
~64K is very inefficient for a modern tape drive.

John

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