Performance & VMmark : vCenter Performance Counters : Comments

RE: vCenter Performance Counters

Iwan Rahabok — Thu, 05 Feb 2009 05:29:57 GMT

Great job Scott!

RE: vCenter Performance Counters

Iwan Rahabok — Thu, 05 Feb 2009 05:56:06 GMT

Hi Scott, the 20 second interval means
"the average of the last 20 seconds" or
"the value on a particular second, with interval taken every 20 second"?

RE: vCenter Performance Counters

drummonds — Thu, 05 Feb 2009 21:07:40 GMT

The 20-second interval means that the values recorded were accrued or averaged over 20 seconds. So, when "ready time" reports a number of 2000 ms, it means that for 2000 ms of the previous 20,000 ms sample period the vCPU was ready to run and not getting resources.

RE: vCenter Performance Counters

olegarr — Mon, 06 Apr 2009 15:37:28 GMT

Scott,

It’s great document and I am using it (along with another your docs) all the time…

Just 1 quick question: is there any doc available that will give some kind of guidance for most important metrics? Something like that: in normal condition parameter xxx should be not more than 123; metric yyy never should exceed limit 321, otherwise…

Thanks,
olegarr

RE: vCenter Performance Counters

drummonds — Thu, 09 Apr 2009 22:45:58 GMT

No, there is no document today that provides this guidance.

However, this is a great question and one that we've been pondering a bit lately. There is a good deal of demand for guidance from VMware on thresholds for these metrics to advise customers of "yellow" and "red" levels for these counters. We're looking into building something like this now but would like to back it with a deep investigation using data from real deployments. It'll take us some time.