Re: Monitoring I/O rate for each VMs

[Thomas Goirand <thomas@goirand.fr>]

Keir Fraser wrote:
> On 27/11/06 09:25, "Thomas Goirand" <thomas@goirand.fr> 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 ???

Thomas