[Linux-cluster] CS4 U4 / timers tuning

[Christine Caulfield]

Alain Moulle wrote:
> Hi
> 
> is there a rule to follow between the DLM lock_timeout
> and the deadnode_timeout value ?
> Meaning for example that the first one must be always lesser than
> the second one ?
> 
> And if so, could we have a deadnode_timeout=60s and the
> /proc/cluster/config/dlm/lock_timeout at 70s ? or are
> there some upper limits not to exceed ?

The DLM's lock_timeout should always be greater than cman's
deadnode_timeout. A sensible minimum is about 1.5 times the cman value,
but it can go as high as you like.

> Another question :
> is there somewhere a list of all parameters around CS4 that
> we are allowed to tune ?

This isn't exactly 'documentation' but it does briefly describe the cman
tunables:

http://sourceware.org/git/?p=cluster.git;a=blob_plain;f=cman-kernel/src/config.c;hb=RHEL4

-- 

Chrissie