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

Olivier Thibault Olivier.Thibault at lmpt.univ-tours.fr
Tue May 30 09:11:03 UTC 2006


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

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

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