Linear Vs Non-Linear Forecast from the Tivoli Performance Analyzer
KiranShashi 2700069WSG Visits (1888)
Tivoli Performance Analyzer (also called as ITPA) - looks at the historical data collected in the TDW ( Tivoli Data Warehouse), by various agents and does some predictive analysis.
There are 2 main categories of calculations. One is the Linear Trending and another is Non-Linear trending to come up with how the resource that is being monitored by the agent will do in the next 7 days, 30 days and 90 days.
Here I have 2 snapshots of OS Agent running on Linux, and showing some forecast trend for Disk Utilization.
Linear Trend ( this is an internal algorithm built into the Performance Analyzer code, that calculates based on "Time" Vs "Data" on the "x' and 'y' axis respectively.)
Non -Linear trend can be enabled by installing SPSS add on to the Performance Analyzer - it does much better resolution at calculating and gives more refined trend and forecast.
Linear Trending snap of Disk Utilization on the server , see the trend line- it is going in an upward slope.
Below is the Non-Linear Trending snap of DiskUtilizaton on a same server ( identical data used above).
Look at the difference between the 2 snaps( this is one of the differences , there are other - which I will cover in upcoming blogs )
The Non-Linear trend in blue shows how the Disk Utilization is going to be in future ( i.e 7 days, 30 days and 90 days) ,.
The yellow bars shows how the disk has performed in the past.
The Critical Threshold of 100%, will be reached around Sep 2013 if the disk utilization at the current rate continues.