PowerMax systems use masking views to assign storage to a host. We recommend creating a single masking view for each SAP HANA system whether host (scale-up) or cluster (scale-out). A masking view consists of the following groups:
The initiator group contains the initiators (WWNs) of the HBAs on the SAP HANA host. For redundancy, connect each SAP HANA host to the PowerMax array with at least two HBA ports.
The port group contains the front-end director ports to which the SAP HANA hosts are connected.
An SAP HANA scale-out cluster uses the shared-nothing concept for the persistence of the database, where each SAP HANA worker host uses its own pair of data and log volumes and has exclusive access to these volumes during normal operations. If an SAP HANA worker host fails, the SAP HANA persistence of the failed host is used on a standby host. All persistent volumes must be visible to all SAP HANA hosts because every host can become a worker or a standby host.
The PowerMax storage group of an SAP HANA database must contain all persistent devices of the database cluster. The SAP HANA name server and the SAP HANA storage connector API handle persistence mounting and I/O fencing, which ensures that only one node at a time has access to a pair of data and log volumes.