On Tue, Dec 18, 2012 at 4:41 PM, Andrew Holway <a.holway@xxxxxxxxxxxx> wrote: > How should I set up io scheduling with this configuration. Performance is not so great and I have a feeling that all of the io schedulers in my VMs and the ones on my host are not having a nice party together. most external storage units do their own io scheduling with sizeable amounts of buffers and cache, so any optimization done by the hosts would be nullified before reaching the media. also, a scheduler in each host ignores what's happening on the other hosts, so their worldview is incomplete at best. therefore, the best you could aim is to minimize latency; that is, send each command out to the storage ASAP and let it sort it out. for that, usually the best is to use the 'noop' scheduler. -- Javier -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
