[Linux-cluster] gfs export over nfs is very slow

[Olivier Thibault]

Hi,


I am testing RHCS on Fedora Core 5.
I have a shared gfs volume mounted on two nodes (using clvmd and lock_dlm).
Locally, everything is ok.
If I export the gfs volume via nfs, i obtain *very poor* performance.
For exemple, from a nfs client with dd, it take 90 seconds to create a 
16 MB file !!!
 From the cluster's nodes, the performances a good, and i made some 
tests exporting xfs over nfs, and it was good too.
So what's wrong with nfs+gfs ?
I would be very interested to know how guys who use this have configured 
it, and what performances they have.

Thanks for any advices.

Best regards

-- 
Olivier THIBAULT
Laboratoire de Mathématiques et Physique Théorique (UMR CNRS 6083)
Université François Rabelais
Parc de Grandmont - 37200 TOURS
Tél: +33 2 47 36 69 12
Fax: +33 2 47 36 69 56