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Re: [Xen-users] SAR in dom0 or domU

To: "[STD]Ein" <ein@xxxxxxxxxxxxxx>
Subject: Re: [Xen-users] SAR in dom0 or domU
From: "Edoardo Ceccarelli" <eddy@xxxxxx>
Date: Sun, 13 Apr 2008 21:37:04 +0200
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
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The abstraction that Xen gives should be enough to give reliable values in certain conditions, I was wondering about disk troughput for example:
using LVM the dom0 sar shouldn't even be able to produce values cause it cannot mount the partition
on the other hand the xenU domain should give pretty reliable values... has anybody tried to compare sar results on xen?
...about cpu's, I completely agree with you

On Sun, Apr 13, 2008 at 5:38 PM, [STD]Ein <ein@xxxxxxxxxxxxxx> wrote:

It depends on what information you are trying to obtain.


If you want information about real hardware (cpu usage, nic's in dom0 etc) installing in dom0 would be the best case.  Installing in domU can give you good info about individual domain specific memory, network, tty usage etc, but cpu percentages may be quite artificial, and you wouldn't be able to see real hardware bottlenecks without examining the other domains.


From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Edoardo Ceccarelli
Sent: April 11, 2008 8:39 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] SAR in dom0 or domU



I was wondering about sar under xen: is it more logical to install it on dom0 or in each domU?
about disk i/o it should be able to give disk throughputs even in a dom0, and maybe, also about cpu usage, memory, etc.

certanly installing sar in a domU will give those values, but will this be reliable?

what's your opinion about this?


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