[Linux-cluster] GFS Tuning - it's just slow, to slow for production

[Steven Whitehouse]

Hi,

On Thu, 2010-03-04 at 09:13 -0600, Doug Tucker wrote:
> Steven,
> 
> We discovered the same issue the day we went into production with ours.
> The tuning paramater that made it production ready for us was:
> 
> /sbin/gfs_tool settune /mnt/users statfs_fast 1
> 
> Why statfs_fast is not set to on by default is beyond my comprehension,
> I don't think anyone could run production without it on.  Anyway, you
> have to set that for every mount point on the cluster, and it has to be
> set on all nodes.  We just created an init script that runs on startup
> after all the cluster services are started.
> 
I suspect that is historical so that we don't surprise people who've not
been used to that feature when they upgrade their kernels. In GFS2 it
defaults to fast.

I'm also trying (gradually) to ensure that there is a way to set all
parameters via the mount command line in GFS2 and therefore to avoid
having to run special programs after mount to set such parameters. We
are not there yet, but we are pretty close now I think,

Steve.