On 13/03/16 21:48, Dan Langille wrote:
>> As well as increasing max file size you need to boost the tape buffer size 
>> from the 64kB default. I use 2MB
> This is a hardware setting?

No, it's a bacula-sd setting

> I tried Minimum block size & Maximum block size on my tape drive, but need to 
> try it again.
>

My settings:

   Spool Directory = /var/bacula/spool/TAPE
   Maximum File Size = 16G
   Maximum Network Buffer Size = 262144
   Maximum block size = 2M
   Maximum Spool Size     = 220G
   Maximum Job Spool Size = 32G


Don't touch minimum block size. It's fine as it is.

2MB is the maximum allowable in bacula, however you probably won't see 
much speed improvement past 500kB unless there's compressible data  in 
the train (it's faster, but only a little. I use it because I have tight 
backup windows and a lot of data to deal with)

FWIW Most LTO tape drives have 8MB(IBM) or 16MB(HP) write buffers.




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