[Linux-cluster] CS4 U4 / timers tuning

[Christine Caulfield]

Alain Moulle wrote:
> Thanks Chrissie
> 
> And is there a way to change the dlm lock_timeout with
> a parameter in cluster.conf ?
> 

Unfortunately not. Only the cman timers can be changed in cluster.conf.
Because the DLM has no userspace portion in RHEL4 there's nothing that
can read cluster.conf for it.

> 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
> 
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-- 

Chrissie