[Bacula-users] LTO-4 performance?
2008-05-22 12:15:42
Hi all,
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 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?
Thanks,
--
Alex Chekholko
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