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Re: [Linux-cluster] High DLM CPU usage - low GFS/iSCSI performance



On 25/02/11 07:21, Martijn Storck wrote:
Thanks for your message.

Somehow the issue has not returned since yesterday when I applied some tuning to our GFS, specifically:

glock_purge 50
demote_secs 100
scand_secs 5
statfs_fast 1


It's most likely the biggest contributor is the statfs_fast setting

For GFS1, We had the following settings (which gave pretty good performance)

for d in `mount | grep ^/dev | grep gfs | grep -v gfs2 | cut -f3 -d" "`; \
 do \
 /sbin/gfs_tool settune $d glock_purge 80 & \
 /sbin/gfs_tool settune $d demote_secs 25 & \
 /sbin/gfs_tool settune $d statfs_fast 1 & \
 /sbin/gfs_tool settune $d statfs_slots 512 & \
 /sbin/gfs_tool settune $d quota_account 1 & \
 /sbin/gfs_tool settune $d quota_enforce 0 & \
 /sbin/gfs_tool setflag inherit_jdata $d & \
 done






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