Re: [OSR-users] plock_rate_limit on GFS OSR Cluster

[Marc G. <gr...@at...>]

Hi,
this sounds like an interesting information. I'll try to validate this on 
Tuesday next week. Then I have better access to my testclusters.

I'll keep you informed.

Thanks
Marc.
On Thursday 28 May 2009 09:17:04 Klaus Steinberger wrote:
> 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



-- 
Gruss / Regards,

Marc Grimme
http://www.atix.de/               http://www.open-sharedroot.org/