Knowing how to appropriately size hardware for a new Cassandra cluster is a vital step to helping your application team succeed. Instances running Apache Cassandra must have sufficient resources available to be able to support the required operational workload.
One important note about the hardware/instance requirements for Cassandra is that it was designed to run on commodity-level hardware. While some enterprise RDBMS suppliers recommend copious amounts of RAM and several dozen CPU cores on a proprietary chassis, Cassandra can run on much, much less. In fact, Cassandra can be made to run on small to mid-sized cloud instances, or even something as meager as a Raspberry Pi. However, as with most databases, Cassandra will obviously perform better with more resource.
