...
Yes, NMIS8 can be configured to store as much performance data as you have disk for. This is very easy to do when you first install an NMIS system. To , but can be done later as well. (If you are using the NMIS8 Virtual Machine please check out our instructions on Resizing NMIS VMs.) To store more data, first you need to determine how much more data you would like to store, then plug those numbers into the RRD Calculator Spreadsheet rrd_calc.xls, attached for your convenience, this will tell you what you need to change in the NMIS8 model file /path/to/nmis8/models/Common-database.nmis
...