Plan for disk space requirements

There are a number of factors to consider when estimating the amount of disk space required to run the Historian:

• Disk space required to install the required software components and files needed to run the Historian.

• Disk space required to store the Historian database files.

• Disk space required to store the Historian data files.

• If a remote IDAS is used, the disk space required on the local IDAS computer to store cached data if the network connection to the Historian fails.

• We recommend that you keep sufficient free disk space (around 20%) so that you can run a disk defragmenting utility without negatively affecting the Historian performance.

A performance report for different Historian systems is provided in System sizing examples.