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