On 21/08/12 12:27, lst_hoe02 AT kwsoft DOT de wrote:

> So i still wonder why the manual recommend not to change this value?

Because some (older) drive types don't like it and will break.

> The problem of not mixing the blocksize is obvious so if there is not
> other downside one should choose a larger value with any recent tape
> drive, no?

It's only obvious to those experienced with tape. Inexperienced admins 
are likely to end up with non-restorable tapes due to mixed blocksizes 
on one volume and not realise what they've done until it's far too late.

LTO drives can handle blocksize up to 16Mb. I suspect that moving to 4 
or 8Mb would result in better throughput but that isn't an option at the 
moment.

Similarly, the 64kb network block size isn't really large enough for 
Gb/10Gb-scale networks but in my experience setting larger values causes 
problems inside bacula.

Alan




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