Friday, December 14, 2007

VMware Capacity Planner: taking the data offline (Part 3: Getting CSV data)

This is part 3 of a series concerning VMware Capacity Planner.

First a general remark about the update to version 2.6 of the tool: it was not always pleasant to use the web interface the last week because of downtime (scheduled maintenance), errors in the interface, latency, etc. It all feels normal again, and some of the new features where definitely worth it.

Back to business: What interests me most when it comes to downloading data from the website is the pure performance data. VMware averages this information over a week, so data can be downloaded on a weekly basis.

I'm not going into the full details of everything that can be tweaked, configured or queried but most of it will be clear when looking at the actual command-line to get a CSV file. Most important is understanding that some of the choices you make are based on the session that is open on te server, and are not selected using POST or GET. Some of these options can be configured on the html view, but not the export view (although the syntax is available) so we have to apply a trick: first get the html view for the type of data we want and then export the data.

Below, you find a typical command-line to download the core VMware statistics for week 45 of a company with ID 1234:

wget --keep-session-cookies --load-cookies cookies.txt
--save-cookies cookies.txt§ion=View&sort=ObjectName&sortDir=ASC&YearWeek=200745&Mon=2&ISO=2&opt=P&PerfGroupID=1&grpt=S&HostType=0&menutab=Performance --post-data CID=1234&YearWeek=200745 --no-check-certificate -O Stats.csv

Note that quite some things have to be specified: week, company, type of average, type of metrics, system group, etc.

Drop me a line or leave a comment in case you want to know more about the precise parameters that are important or in case you're interested in my little script that does the magic for me.

This concludes the practical part of this series. I plan to write more about capacity planning and capacity monitoring in general later...

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