What is Secondary NameNode

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performs periodic checkpoints of the Namespace and helps keep the size of file containing log of HDFS modifications within certain limits at the NameNode.

Other related questions:
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.

What Is the Usage of the Secondary LUN of Remote Replication?
In a remote replication session, the secondary LUN and the primary LUN form a pair, and the secondary LUN backs up the data on the primary LUN. Normally, the secondary LUN (unreadable and unwritable) cannot be accessed by hosts. If a host needs to access the secondary LUN, you can create a snapshot for the secondary LUN and map the snapshot to the host.

5300 V3 clone specifications
OceanStor 5300 V3 clone specifications are as follows: Maximum number of primary LUNs: 128 Maximum number of secondary LUNs: 256 Maximum number of secondary LUNs in a clone group: 8 Maximum number of consistent split pairs: 64 For detailed specifications, see V3R1 Latest Software Specifications.

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