[Linux-cluster] Kernel I/O scheduler

[Jeff Stoner]

Just a thought...anyone do any load testing with GFS (and non-GFS
clusters) using different I/O schedulers (CFQ v Deadline v NOOP v as?)

--Jeff
Service Engineer
OpSource Inc.
 

> -----Original Message-----
> Subject: Re: [Linux-cluster] reducing heartbeat interval
> 
> garylua at singnet.com.sg wrote:
> > Hi, hwo do i go about changing the heartbeat intervals for cluster 
> > suite for RHEL4? Is the minimum 5 seconds, or can i go even lower, 
> > like 1 sec? thanks
> 
> cluster.conf parameters (eg):
> 
> <cman hello_timer="1" deadnode_timer="10"/>
> 
> The number are integer seconds so 1 is the smallest value you 
> can have. Before you put that into production though, check 
> it under load because high I/O or network loads can cause 
> spurious node "failures".
> 
> see /proc/cluster/config/cman for all the changeable values.