Hi Paul,
I'm guessing from the information you give below that you're using a
Promise VTrak M500i with 1 TB disks? Can you confirm this? I had uneven
experience with that platform, which led me to abandon it; but I did make
one or two discoveries along the way which may be useful if they are
applicable to your setup. Can you share a little more about your hardware
and setup?
Regards,
James Chamberlain
On Tue, 27 Nov 2007, Paul Risenhoover wrote:
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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