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



Hi,

I have upgraded FC5, and it's now much better.
For information, here is a bonnie++ test result, on gfs exported via nfs, gigabit ethernet lan. Version 1.01d ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP poisson 4G 21383 19 21582 6 4026 75 24101 21 22974 3 259.8 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 158 1 517 91 248 2 157 1 3243 22 238 2


Locally, the same test is more than twice faster.
Does someone knows if there are optimizations for gfs and nfs, other than ones found in NFS Howto ?

Best regards,

Olivier

Olivier Thibault a écrit :
Hi,

Raj Kumar a écrit :
 > Hi,
 >
> 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.
 >
 > Regards,
 > Raj
 >
 >

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

Olivier

On Tue, 30 May 2006 Olivier Thibault wrote :
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

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