[Nagiosplug-help] Plugin for measuring ressource starvation (I/O and CPU) in a virtual machine

[Ian Rarity]

One thing that I've found handy is to check for the presence of the "VMWare balloon driver"; if it's loaded, then the host that the VM's running on is looking for resources and using this to reclaim memory from its guests.  You can, of course, just install NRPE/NSClient/whatver on the VM and monitor it that way as well.  It depends on how your resource allocation is done, but I have seen VM's reporting 90% CPU utilisation while their host blade insists that everything's fine.

Ta,
IR.

*******************
Ian Rarity
Technical Engineer
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From: Steffen Poulsen [mailto:sp at tdchosting.dk]
Sent: 31 March 2009 11:02
To: Nagios Plugin Help List
Subject: [Nagiosplug-help] Plugin for measuring ressource starvation (I/O and CPU) in a virtual machine

Hi all,

I was wondering if perhaps a plugin is available to measure the performance of a virtual machine, from "the inside"?

Typically you will have users complaining that the I/O performance is not what it was "yesterday" or that their machine is/was in other regards not behaving as expected.

Most of this can and should of course be measured from "the outside", through esx3 plugins of various sorts - but still the end-user experience can be challenging to measure in a trustworthy way using these tools.

Did anybody by any chance do something in this direction already?

Best regards,
Steffen Poulsen



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