Re: [Xen-devel] Monitoring I/O rate for each VMs

[Muli Ben-Yehuda <muli@xxxxxxxxxx>]

On Tue, Nov 28, 2006 at 04:04:34PM +0800, Thomas Goirand wrote:
> Keir Fraser wrote:
> > On 27/11/06 09:25, "Thomas Goirand" <thomas@xxxxxxxxxx> wrote:
> > 
> >>> Unfortunately these count requests rather than bytes served. This may be
> >>> what you want though, as #requests should be proportional to the number of
> >>> expensive disc operations (seeking and settling). Long contiguous requests
> >>> are not proportionally more expensive than short ones.
> >> Hi!
> >>
> >> I didn't find such file where you said. Even a "locate statistics"
> >> didn't help. Note that I'm using lvm partitions, and xen 3.0.2-2 (and
> >> 2.0.7 in some older servers), and my LVs are of form /dev/lvm1/xen01, is
> >> <path-to-vdb> for loopback?
> > 
> > I think the stats were added during 3.0.3 development. There's no way to get
> > the information you seek with older versions of Xen, although you could try
> > taking the blkback driver from a 3.0.3 tree and build it against your Linux
> > dom0 kernel.
> 
> cat /sys/block/dm-21/stat
> 8        0       96       95       63        0     4432     1608
> 0      579     1703
> 
> What are the meaning of those numbers ???

The best way to know is to check the source code that generates
them...

Cheers,
Muli

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel