[Linux-cluster] gfs export over nfs is very slow
Olivier.Thibault at lmpt.univ-tours.fr
Tue May 30 15:22:36 UTC 2006
Raj Kumar a écrit :
> 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
Thank you for your answer.
I am upgrading to last GFS/DLM/CMAN kernel stuff and will retry.
I've ran bonnie++ with ext3 exported over nfs and it is really speeder
even if it's not what i expected. I got about 22 MB/s (r/w).
But i saw that nfsd was consuming a lot of CPU. The system load was 15 !!
I've also ran test with Suse SLES9 xfs exported over nfs. I got 40MB/s,
which is what aim to get with GFS ...
I don't understand ...
Is there anybody who export gfs over nfs with FC5 ?
Thanks by advance
> 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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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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