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. :(