Clarification on ServerEndPointGroup of a StorageGroup

Q1: Is there any other reason behind defining multiple server endpoints to single LUN/Volume?

A1: This functionality supports a very common scenario for network based storage known as multi-pathing. In SCSI, this is supported by a feature known as Asynchronous Logical Unit Access (ALUA). Typically access to these multiple paths is serialized by a multi-path driver on the initiator side. The multi-path driver is responsible for recognizing that a logical unit (volume) has been exposed via multiple paths. The multi-path driver then generally presents the volume as a single logical disk to the operating system.

Q2: Is there any attribute/class maps LUN to specific ServerEndPoint (One-To-One) rather than doing it as a group?

A2: No. This functionality is used for SAN access to a Volume and there are typically multiple paths to support availability and performance considerations. Note 1: StorageGroup has a ClassOfService. The availability and performance aspects of that ClassOfService should govern the minimum number and type of server side endpoints configured by the service implementation.