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

Raj Kumar rajkum2002 at rediffmail.com
Tue May 30 14:59:18 UTC 2006


We are using GFS6.0 (no cluster suite) and NFS exports of the file system. I am getting a transfer rate of about 35MB/sec. We have a high speed SAN. Actually the transfer rate can be little higher but we attribute the slow rate to NFS itself since we see the same numbers for EXT3 also. 


On Tue, 30 May 2006 Olivier Thibault wrote :
>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
>Linux-cluster mailing list
>Linux-cluster at redhat.com
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