> I searched the archives and found a thread on bacula-users from Dec07 with 
> subject "LTO-4 backup rates", and also a thread on bacula-devel from Sep07 
> with subject "Bacula performance with a 64512 block size".
>
> I just got a new IBM TS3310 with 3 LTO-4 SAS drives, and after my initial 
> Bacula setup, I'm getting ~23MB/s writing to the drive.
>
I get that speed with a 4 year old 2Ghz Opteron system and a LTO2
drive which is part of an autochanger.

>
> I have verified that the local disk is not the bottleneck as well as the 
> actual source (a SAN volume via 10gigE) as bonnie++ gets me numbers as high 
> as 330MB/s.  I have also verified that I can write to all three drives at 
> once (~24MB/s each) and otherwise load the server (disk I/O, CPU) without 
> affecting the 23MB/s write rate.  It seems like writing to the tape drive is 
> the bottleneck.
>
> Asking on another forum I got a suggestion to increas the "block size" and 
> "buffer size", but it is not clear to me how to do that with my hardware and 
> Bacula.
>
> I see the "Maximum Network Buffer Size" directive, and I'll try testing the 
> performance with different values for that, but is there anything else I can 
> tweak?  Another thread I found in the archive suggests that the current 
> default buffer size is 64KB.
>
> We were consistently getting ~60MB/s to our LTO-3 drives with older hardware 
> and Bacula, so I was hoping for ~120MB/s.
>
> This isn't specifically a Bacula software problem, I'm getting ~23MB/s with 
> "btape fill".  This is Bacula 2.2.8 on CentOS 5.1 on an IBM x3650.
>
> Any suggestions?
>
Are you using spooling? Are you backing up millions of files? Is your
database on the same system as the one that is being backed up?

John

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