We recommend a system with at least 2 GB of RAM for an iCAT server. The actual iRODS packages require less than 100 MB of disk space. However, dependencies may require extra space.
In a production environment, the relational database will most likely reside on one or more servers, separate from the iCAT server. Refer to the documentation for the database for advice on sizing the database server. In general, as the size and access rate of the database increase, more RAM and processor cores will be required for acceptable performance.