On Fri, Jul 03, 2009 at 05:59:05PM -0500, Javier Guerra wrote: > On Fri, Jul 3, 2009 at 9:00 AM, Lars Ellenberg<lars.ellenberg@xxxxxxxxxx> wrote: > > the elevator of the lower level block device (in this case, > > the kvm virtual block device, or the host real block device) > > so, the original post (Michael) was running drbd on the KVM guests?? That was my impression, from the introduction: >> Today I tried drbd for the first time, and decided to start >> experimenting on two virtual machines. > i thought the only sensible setup was using dbrb on the hosts, to make > VMs live-migrable. Right. But his findings are still interessting. It may help to track down all spurious timeouts and "anticipatory" idle-waits, and try to disable them, or move them out of the picture. Even ignoring DRBD for a moment, that should also be an interessting and beneficial excercise for VM block device performance in virtualization alone. -- : Lars Ellenberg : LINBIT | Your Way to High Availability : DRBD/HA support and consulting http://www.linbit.com DRBD® and LINBIT® are registered trademarks of LINBIT, Austria. __ please don't Cc me, but send to list -- I'm subscribed -- 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
