Andrew Bond wrote:
Have you looked at the MRTG tools available on NOW? They can be used to generate graphs of usage (including CPU) over a selectable period.
The tools are at http://now.netapp.com/download/tools/filer-mrtg/ MRTG is at http://ee-staff.ethz.ch/~oetiker/webtools/mrtg/mrtg.html
Yes, I know that, we use those tools and a lot more. However, there's a problem here. For example, if we look at a NetCache Appliance and use this tool to calculate CPU idle%, we do get a curve looking plausible enough, but it is very misleading. Since MRTG only queries the server every 5 minutes, the formula calculates an *average* CPU idle% for the last 5 minutes. It comes to 25%. However, in reality the proxy server has very frequent peaks to 0% idle and sometimes remains there for 5-15 seconds in a row. So looking at the graph I conclude that the proxy server still has a lot of unused CPU capacity, whereas in reality it isn't true since the CPU gets rather long periods of saturation.
As I said before, averages do not really say that much. I would much prefer to have immediate measurements on my MRTG graph.
And by the way, monitor pages on NetCache Appliance also display averages since the last boot. I suggest to replace them all with immediate values, or at least with averages over short periods of time (last 5 minutes) for things like hit rate and such.
Regards Elena
---------------------------------------------------------------- Elena Samsonova e-mail: E.Samsonova@wxs.nl World Access / Planet Internet phone: +31 33 45 40 417 PO Box 2529, 3800 GB Amersfoort fax: +31 33 45 40 401 The Netherlands ----------------------------------------------------------------