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

[Joris Dobbelsteen <joris@xxxxxxxxxxxxxxxxxxxxx>]

Edoardo Ceccarelli wrote:
> 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
I use SAR on Dom0... I have LVM on top op MD. It shows correct results 
for all LVM block devices, whether or not they are mounted.
In fact I had it spot a domain doing heavy I/O on its swap partition, 
caused by syslog-ng going nuts when the log disk was full.
I think you already rules out CPU. Overall I'm pretty sure about the 
block device and (non-HVM attached) NIC values. Memory is scoped, so its 
per DomU.
This is Xen 3.1.2 on Linux 2.6.18 (Gentoo).

- Joris

[snip]


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