Re: [Xen-users] performance and ressource monitoring and statistics

[Alex Iribarren <alex.iribarren.lists@xxxxxxxxx>]

Hi,

I'm starting to look into monitoring the dom0 for the same reasons as
you. Have you discovered/developed anything interesting since writing
this email?

Cheers,
Alex

Henning Sprang wrote:
> Hi,
> Apart from normal service availability and quality monitoring and
> measuring of ressources on a system as it would be done for any normal
> machine, I think about additionally monitoring Xen-specific data and
> creating one/some Nagios plugins for this.
>
> So one idea is that I want to know when cpu, net and disk I/O on a Xen
> host are saturated, which could, depending on specific needs and
> SLA's, make it necessary to add ressources to the host or migrate VM's
> to other hosts on which these ressources aren't saturatd yet, or
> aother measures.
>
> While, as far as I understand it, CPU scheduling and traffic shaping
> are highly  useful to set rules to allocate a given share of the
> available ressources to specific vm's, and set minimal and maximal
> amounts of these shares, in some cases it might be desirable to get
> more information, and be warned.
>
> As a result of this, I started to analyze (with a nagios plugin)
> different sources of xen runtime data, beginning with the output of
> xentop -b -i 2, and will mgo on to look deeper into libxenstats,
> XenMon and xenoprof(of which I am not yet sure if it's good for
> analyzing production runtime data, or if it's more the kind of
> profiling one does in non-production environments).
> Getting CPU share and seeing when the CPU is fully loaded is no great
> deal.
> Getting useful information of net and disk I/O saturation requires a
> lot of math and measuring (what's the maximum possible net/disk I/O on
> that machine, under the given configuration? ) -  they both are
> depending on overall hardware, cpu scheduling and a lot of other
> factors - I am really not sure if this is worth the trouble.
>
> I am at the same time working on implementations and looking at
> information and publications on that topic, like multiple papers on
> XenMon available, and so on.
>
> Did anybody else think about this, or anybody has comments if this is
> the right direction to think or better/concrete data to collect and
> look at?
>
> Henning
>
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