Volume Capacity Forecast

I'm curious to hear opinions on how accurate people are finding the forecasts.


  • if your growth is linear and predictable then the forecasting can track that, erratic and sudden changes can't really be predicted by looking at historical data.

    In my experience 90% of outages where I've been occur due to unexpected growth because we long ago got used to running cleanup scripts and rotating log files and all that obvious stuff.  Things like a database change that causes the log drive to explode are what I run into and often you go from working fine, to 100% and locked up in under 30 min.

    Given the abstraction layers in modern IT, I almost don't care to know about drive utilization on individual disks.  I just need to know what my capacity utilization looks like at the SAN or what my cloud storage bill is costs.