On Mon, Mar 22, 2010 at 12:39 PM, Nikolai K. Bochev <n.boc...@grandstarco.com> wrote: > I am quite curious about the state of qcow2 format in Lucid. As i recently > discovered, when running a KVM machine with a qcow2 disk , i get a great > performance hit under karmic. Seems that not only disk performance is > decreased ( copying with 2 Mb/sec from the host to the guest and with around > the same from the network to the guest ), but it hits the cpu on the guest > pretty hard and the machine ( guest ) can become quite unstable. I know this > is more of a KVM/QEMU question, but i was wondering if anyone played around > with Lucid already and with that part in particular. I have quite a few > virtual hosts with lots of guests on them running on production environments > and i want to know if i should just switch to raw format or wait until Lucid > comes out and keep the qcow2 format of the disks.
I'm using KVM + qcow2 + virtio with Lucid host and Lucid guest quite extensively. Can you tell me more about your setup, as I'd like to see if I can reproduce the problem you're seeing? Specifically, what is your kvm command line when you're seeing the problem, and what are you using to measure your performance or disk throughput? :-Dustin -- ubuntu-server mailing list ubuntu-server@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-server More info: https://wiki.ubuntu.com/ServerTeam
