Re: [Xen-users] Extremely poor iSCSI performance

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Jan 22, 2010 at 09:28:19AM -0600, Joseph Coleman wrote:
>    Hi all not sure if anyone can help  but I have an OCFS2 volume setup on my
>    4 xen  nodes. If you do like 4  cp copies to the iscsi volume the systems
>    pause for up to 30 seconds as well as the VM itself. The San looks fine
>    and I am not taxing the xen server either anyone else seen this?
> 

Have you configured Xen credit scheduler domain weights so that dom0 is 
guaranteed 
to get enough CPU time? (ie. more than the guests to be able to process 
disk/net IO).

See:
http://wiki.xensource.com/xenwiki/XenBestPractices

How does the OCFS2 perform if you benchmark it from dom0, without any guests 
running?

-- Pasi
 

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