From mboxrd@z Thu Jan  1 00:00:00 1970
From: Thomas Goirand <thomas@goirand.fr>
Subject: Re: Monitoring I/O rate for each VMs
Date: Mon, 27 Nov 2006 17:25:43 +0800
Message-ID: <456AAF17.4000204@goirand.fr>
References: <C1904E57.4DA2%keir@xensource.com>
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Keir Fraser wrote:
> On 26/11/06 9:49 pm, "Thomas Goirand" <thomas@goirand.fr> wrote:
> 
>> It's nice already, but I'd like to add the I/O rate of each of my VMs as
>> well, to know which of them is taking too much bandwidth or hard drives.
>> Does one of you know where to get this information?
> 
> There are per-vbd read and write stats under
> /sys/<path-to-vbd>/statistics/{rd_req,wr_req}
> 
> 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?

Thomas

P.S: No need to write to me, I'm subscribed