Description of problem: while trying to create new RDB pool (for compression) from the UI, in the replica selection list, you can select replica-2 or replica-3, while the cluster was created with replica-4 (default for arbiter) Version-Release number of selected component (if applicable): OCP: 4.7.0-0.nightly-2021-02-06-084550 OCS: ocs-operator.v4.7.0-254.ci How reproducible: Steps to Reproduce: 1. deploy OCP 4.7 2. deploy OCS 4.7 with Arbiter 3. create new SC with new Pool Actual results: in the replica section you can select replica-2 / replica-3 Expected results: the list will contain replica-4 Additional info: