From: djani22@dynamicweb.hu
Message-ID: <022d01c5a29a$bf3df860$0400a8c0@LocalHost>
To: <linux-xfs@oss.sgi.com>
References: <001001c59bfb$1fe7aae0$0400a8c0@LocalHost> <42F74B6D.8060002@gmx.net> <00d801c59c20$e0354080$0400a8c0@LocalHost> <42F798AF.5080505@gmx.net>
Subject: Re: XFS-log +performance question
Date: Tue, 16 Aug 2005 21:43:07 +0200
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Hello list,

I have a little performance problem on my 8TB system.

I use 4 disk nodes.
The 4 disk node is joined with RAID0, chunksize 32k. (4x 2TB)

The problem is, the node-2. and node-3. is much more loaded then another.

I searching this problems source for a long time, and I found one reason:

The XFS's log is always on node 3 (on the third 32k chunk).
Am I right?

It is possible to get out the log to an alternative free and fast device
without re-"format" the whole filesystem?

Additionally the node-2 and node-3 reads about 4x - 5x more blocks than the
1 and 4, but I don't know why.
If somebody has an idea, let me know! :-)

This is the blottleneck of my system, but I can't fix it. :(

Thanks

Janos