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

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


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