Persistent and ephemeral storage
For each node in the cluster you can configure both a persistent storage and an ephemeral storage path.
- Persistent storage is mandatory; it is used by the cluster to store information that needs to persist even if a shard or a node fails. For example, if you choose any type of persistence for a database, then the persistence information is stored in this location.
- Ephemeral storage is optional. If defined, it is used by the cluster to store information that does not need to persist. This aids in optimization and helps to reduce the load on the persistent storage.
For disk size requirements refer to the following sections:
- Hardware and software requirements for general guidelines regarding the ideal disk size each type of storage
- Disk size requirements for extreme write scenarios for special considerations when dealing with a high rate of write commands