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Re: [Linux-cluster] slow NFS performance on GFS2



Hi,

On Tue, 2013-09-24 at 11:29 +0200, Olivier Desport wrote:
> Hello,
> 
> I've installed a two nodes GFS2 cluster on Debian 7. The nodes are 
> connected to the datas by iSCSI and multipathing with a 10 Gb/s link. I 
> can write a 1g file with dd at 500 Mbytes/s. I export with NFS (on a 10 
> Gb/s network) and I only can reach  220 Mbytes/s. I think that it's a 
> little bit far from 500 Mbytes/s...
> 
> Do you how to tune my settings to increase the speed for NFS ?
> 
> GFS2 mount :
> /dev/vg-bigfiles/lv-bigfiles /export/bigfiles gfs2 
> _netdev,nodiratime,noatime 0 0
> 
> NFS export :
> /export/bigfiles 
> 172.16.0.0/16(fsid=2,rw,async,no_root_squash,no_subtree_check)
> 
> mount on NFS clients :
> nfs-server:/export/bigfiles /data/bigfiles nfs4 
> _netdev,rw,user,nodiratime,noatime,intr 0 0
> 

One possibility is to try changing rsize and wsize at the client end. Is
the 10G network used for NFS the same network as the one used for the
iSCSI?

I assume that the NFS is set up active/passive on the two GFS2 nodes, so
only one node is exporting the GFS2 fs via NFS in the normal case?

Steve.



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