On 21/08/12 08:37, lst_hoe02 AT kwsoft DOT de wrote:
> Some short tests with the "Maximum Block Size" set, show transfer 
> speed to the LTO-4 of 87MBytes/sec with 256K and 98MBytes/sec with 1M 
> with Bacula encrypted data, so with this we are reaching the 
> theoretical uncompressed speed of the LTO-4 device by ~20%. It would 
> be really helpful if there is some developer to say if there is any 
> downside of large block sizes? 

I'm not a dev, however I use 2Mb block size (this is the largest bacula 
currently supports)

The only downside is that you _must_ mark all active tapes as "used" 
before changing block size.

Bacula will be able to read the old tapes, but it cannot handle maximum 
block size changing midway through a tape.





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