Re: [Bacula-users] LTO-4 performance?
2008-05-22 13:10:52
> 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
-------------------------------------------------------------------------
This SF.net email is sponsored by: Microsoft
Defy all challenges. Microsoft(R) Visual Studio 2008.
http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/
_______________________________________________
Bacula-users mailing list
Bacula-users AT lists.sourceforge DOT net
https://lists.sourceforge.net/lists/listinfo/bacula-users
|
|
|