Re: [Xen-users] Re: [Libvir] Xen physical host statistics

[Mindaugas Kiznis <mk splius lt>]

Thank you for your quick answer. In my opinion, I/O statistics are 
critical as CPU, memory usage in data center environment to optimally 
plan, arrange, spread VMs in a resource or say Xenhost pool. Since there 
are many Xen hosts in my case and this number is growing, it is a need 
to monitor each host's resource usage in a centralized console, graphing 
engine, etc. Hope to see these additions in the next releases of libvirt.

Best regards,
Mindaugas Kiznis

Richard W.M. Jones wrote:
> Mindaugas Kiznis wrote:
> > - I am trying to make an application, which would connect to a remote 
> > xen host and fetch some information about total (physical) CPU usage, 
> > total memory usage, network and disk I/O. I have managed to do a 
> > remote statistics grabber for CPU and memory usage using libvirt. I 
> > couldn't find any source of information about libvirt ability to 
> > return I/O numbers. Also haven't found any other solution yet. Any 
> > suggestions?
>
> It's very interesting that you should ask this, because I am 
> investigating adding network I/O and block I/O stats to libvirt.  We 
> would get the information from /sys/devices/xen-backend/... in the 
> same way that libxenstat does it at the moment, and pass that up 
> through libvirt APIs.  As with all libvirt-related stuff we need to 
> think about how it will apply to the other hypervisors that we support 
> and could support in the future.
>
> You are quite right that there is no facility for this in libvirt 
> right now (just CPU-/memory-based stats at the moment).
>
> See also: http://et.redhat.com/~rjones/virt-top/
>
> Rich.
>
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