[Linux-cluster] slow NFS performance on GFS2

[J. Bruce Fields]

On Tue, Sep 24, 2013 at 11:29:07AM +0200, Olivier Desport wrote:
> Hello,
> 
> I've installed a two nodes GFS2 cluster on Debian 7.

What kernel is that?

--b.

> 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
> 
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