HowTo Increase GFS2 Performance in a Cluster

[ Thanks to Allen Sanabria for this link. ]

"By default the plock_rate_limit option is set to 100. This will allow a maximum of 100 locks per second, which will decrease your GFS2 performance. See below...

dlm plock_ownership="0" plock_rate_limit="100"/>
   

"You can test the performance of you cluster by downloading the program ping_pong.c. This program was very helpful to me in debugging the poor performance in my GFS2 cluster.

"The instructions on how to compile the program and run it is on the site http://wiki.samba.org/index.php/Ping_pong.When I initially ran ping_pong, I only got a max of 97 plocks per second. After removing the rate limit I was able to get about 3000 Plocks per second."

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