What Is the Usage of the Secondary LUN of a Remote Replication

In a remote replication, the secondary LUN and the primary LUN form a pair, and the secondary LUN backs up data on the primary LUN.
? In normal cases, the secondary LUN of a remote replication cannot be accessed by hosts. Therefore, if a host needs to access a secondary LUN, you can create a snapshot for the secondary LUN and map the snapshot to the host for access.
? In the event that a primary LUN failed, which leads to service interruption, you must perform a primary/secondary switchover to switch the secondary LUN to the primary LUN and then map the new primary LUN to the host for data access.

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