[OSR-users] plock_rate_limit on GFS OSR Cluster

[Klaus S. <kla...@Ph...>]

Hi,

because of some testing of a samba/ctdb Cluster on top of OSR i tweaked 
around with the Posix Locking Rate Limit of gfs_controld. The default 
for plock_rate_limit is "100", which is quite low.

I raised the limit now on one of my SL 5.3/GFS OSR clusters (a virtual 
one) to 10000, which seems to be higher than the real rate (I measured 
up to 2200 / sec using ping_pong ).

I see a very interesting side effect:

The startup of nodes seems to be quite faster now. Especially the ever 
slow udev startup after changing root runs as a charm.

So maybe somebody could try to confirm that?


To raise plock_rate_limit put the following line into 
/etc/cluster/cluster.conf:

  <gfs_controld plock_rate_limit="10000"/>

Please be aware that gfs_controld cannot be restarted or reconfigured on 
a running node! A node have to be rebooted to change plock_rate_limit.

Sincerly,
Klaus