Sorry about this mis-send.
I'm guessing my problem has to do with this:
https://www.redhat.com/archives/linux-cluster/2007-October/msg00332.html
BTW: My file system is 13TB.
I found this article that talks about tuning the glock_purge setting:
http://people.redhat.com/wcheng/Patches/GFS/readme.gfs_glock_trimming.R4
But it seems to require a special kernel module that I don't have :(.
Anybody know where I can get it?
Paul
Paul Risenhoover wrote:
Hi All,
I am experiencing some substantial performance problems on my RHEL 5
server running GFS. The specific symptom that I'm seeing is that the
file system will hang for anywhere from 5 to 45 seconds on occasion.
When this happens it stalls all processes that are attempting to
access the file system (ie, "ls -l") such that even a ctrl-break can't
stop it.
It also appears that gfs_scand is working extremely hard. It runs at
7-10% CPU almost constantly. I did some research on this and
discovered a discussion about cluster locking in relation to
directories with large numbers of files, and believe it might be
related. I've got some directories with 5000+ files. However, I get
the stalling behavior even when nothing is accessing those particular
directories.
I also tried some tuning some of the parameters:
gfs_tool settune /mnt/promise demote_secs 10
gfs_tool settune /mnt/promise scand_secs 2
gfs_tool settune /mnt/promise/ reclaim_limit 1000
But this doesn't appear to have done much. Does anybody have some
thoughts on how I might resolve this?
Paul
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