[Linux-cluster] gfs performance

[Jure Pečar]

Hi all,

while testing my first rhcs4 cluster, I noticed some poor performance while
tarring data from a gfs volume to a local disk from both nodes at the same
time. I deceided to have a closer look.

Here are the bonnie++ results: http://jure.pecar.org/gfs/

I don't know what to think of these ... but I doubt it's normal for
performance to go down by an order of magnitude when both nodes are doing
some i/o to the shared file system ... 

I'd like to understand what's going on here, where&how to look for
bottlenecks and how to get rid of them.

Thanks,

-- 

Jure Pečar
http://jure.pecar.org/