KVM, NFS, iSCSI and storage pools

[Daniel Sheridan]

On Thu, 2011-03-10 at 14:02 +0100, jurgen.depicker at let.be wrote:
> Hi all. 
> 
> Presently, 7 VMs (4 windows, 3 ubuntu) are using the same nfs pool.
>  The machine serving that NFS pool (VLET1) has high load as soon as
> there is some continuous disk activity: 
> 
> top - 13:25:30 up 23:16,  5 users,  load average: 4.51, 4.41, 3.98 

Have a look at the NFS howto performance section:
http://nfs.sourceforge.net/nfs-howto/ar01s05.html

In particular, check that you have sufficient threads (section 5.6) --
configure this is Ubuntu in /etc/default/nfs-kernel-server. I have 160
threads configured on a server in a similar configuration.

(However, I've just had a look at my /proc/net/rpc/nfsd and the 'th'
line is showing all zeros -- anyone know why?)

	Dan.