[Ocfs2-users] Significant Slowdown when writing and deleting files at the same time

[Andy]

I have been having performance issues from time to time on our 
production ocfs2 volumes, so I set up a test system to try to reproduce 
what I was seeing on the production systems.  This is what I found out:

I have a 2 node test system sharing a 2TB volume with a journal size of 
256MB.  I can easily trigger the slowdown by starting to processes to 
write a 10GB file each, then I delete a different large file (7GB+) 
while the other processes are writing.  The slowdown is significant and 
very disruptive.  Not only did it take over 3 minutes to delete the 
file, every else with pause when entering that directory too.  A du 
command with stop and nfs access to that file system will think the 
server is not responding.  Under heavier amounts of writes, I have had a 
delete takes 13mins for a 8GB file, and NFS mounts return I/O errors. 
We often deal with large files, so this situation above is fairly common.

I would like any ideas that would provide smoother performance of the 
OCFS2 volume and somehow eliminate the long pauses during deletes.

Thanks,

Andy