Re: [Xen-devel] VM disk I/O QoS

["Fajar A. Nugraha" <list@xxxxxxxxx>]

I moved your question to xen-users.

On Tue, Mar 20, 2012 at 10:36 AM, ND KK <k110168@xxxxxxxxx> wrote:
>
> It is possible to do QoS for disk I/O with blktap2?

Yes. Somewhat. But it's not part of xen.

>
> Can any of you be so kind and point me to the right direction, perhaps a doc
> or a tutorial somewhere?

AFAIK Oracle VM (which uses a customized version of xen under the
hood) uses ionice to do that. The problem is, like I said earlier,
it's not part of xen (the hypervisor and userland tools), so you
either need to write your own scripts to do that. Or just use Oracle
VM.

Another alternative would be using latest vanilla kernel, and use
block cgroup: 
http://www.mjmwired.net/kernel/Documentation/cgroups/blkio-controller.txt

-- 
Fajar

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