Custom RRA Calculator

[hank42]

After reading some excellent threads here on custom RRA's and averaging etc, I assembled this RRA calculator to make things easier.

Just input your poller time(default is 5 minutes), and the spreadsheet will update - allowing you to enter the STEP and ROW numbers for custom RRA's. REmember, the Xfiles should always be 0.5.
The Timespan column has nothing to do with the RRA, but should be set as many seconds as you want Cacti to display on the graph in one view for that RRA.

I am pretty sure it is accurate - I welcome any comments or corrections.