On Tue, 2011-07-12 at 07:03 +0100, Matthew Macdonald-Wallace wrote:
On Tue, 2011-07-12 at 00:21 -0500, Stan Hoeppner wrote:
Are these virtual machines? You didn't state so previously. Running 2.6.18 as a VM guest on these machines may also be part of the incorrect load reporting problem. If so, run the data collector daemon inside the hypervisor itself so you get actual load figures. You'll never get accurate performance metrics for a whole box from a kernel/daemon inside a VM guest.
Nope, all on the bare metal in our own datacentre.
I'll let you know how the HT switchoff goes.
M.
Hi all,
Just to let you all know that once we upgraded to Dovecot 1.2 (and enabled attribute caching on the NFS devices!) the loads settled down.
We've seen a drop in 15 minute load average from 12 to 2 and a drop in NFS I/O from 30K I/OPS to 3K I/OPS whilst continuing to serve the same number of queries - quite a difference!
Thanks to all who helped,
Kind regards,
Matt