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

23

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.

Other related questions:
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.

How to use a secondary LUN in 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. ? By default, the secondary LUN cannot be accessed (read or written) by a host. If a request is made to access data on the secondary LUN, you can create a virtual snapshot for the secondary LUN, and then map the virtual snapshot to the host for access. ? When a primary LUN encounters a critical error and the services are interrupted, you must perform the master/slave switchover to switch the secondary LUN to the primary LUN, and then map the new primary LUN to the host for access. NOTE: For details on how to perform a master/slave switchover, choose Help > Help Topics on the ISM, and view the related help information.

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.

6900 V3 clone specifications
OceanStor 6900 V3 clone specifications are as follows: Maximum number of primary LUNs: 256 Maximum number of secondary LUNs: 512 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.

What is the principle of setting bandwidth for remote replication and LUN copy among storage arrays?
The bandwidth refers to the amount of data that is transferred on a channel in a certain period of time. Its common unit is bit per second (bps). The bandwidth of a computer network refers to the maximum data rate on the network, namely, the number of bits transferred per second. When setting the bandwidth, note the following: ? The bandwidth should be set to meet the requirements of actual services. You can customize a proper bandwidth as required. ? The bandwidth should be set no larger than the current bandwidth of customers' network. If the workload in the system is heavy, the bandwidth for remote replication and LUN copy among storage arrays can be correspondingly reduced to guarantee the normal running of ongoing services.

If you have more questions, you can seek help from following ways:
To iKnow To Live Chat
Scroll to top