Am 09.02.2012 15:01, schrieb Daniel P. Berrange: > On Thu, Feb 09, 2012 at 10:35:02AM +0100, Akendo wrote: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA1 >> >> I have to create some VM. I using KVM for it, manage by libvirtd. The >> problem of my is that the IO is very bad. I'm nut sure, but I using >> currently vmdk. Could this be the problem? > > I think that is a very likely suspect. The only drivers in QEMU > that have had any serious performance tuning are QCow2 and raw. > The vmdk driver is not really actively maintained beyond bug > fixing. I'd strongly recommend you try just 'raw' file formats > instead for maximum performance, and make sure you use 'cache=none' > for the disks too. Let me repeat my question from the other thread here: I wasn't able to set "cache=none", the libvirt(?) complained. 0.9.8, btw. What might be the reason?
