Why Cannot Information About the Primary and Secondary Storage Systems Involved in a Remote Replication Be Updated in Real Time?

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The symptoms and causes are as follows:
? Symptom 1: After a data synchronization is initiated between the primary and secondary LUNs of a remote replication, the secondary storage system fails to display the synchronization progress in real time.
Cause: To display the synchronization progress in real time during a data synchronization, the secondary storage system must send query tasks to the primary storage system. This adversely affects system performance.
? Symptom 2: After the name of the primary storage system is changed, the name displayed in the remote replication information is not updated in real time.
Cause: The name of the primary storage system displayed in the remote replication information is obtained by invoking the interface of the system management module, not by using the remote replication module. Therefore, in the event that a device name is changed, the remote replication does not automatically obtain the updated information. In this case, you can refresh the remote replication information or log in to the ISM again. Then, the updated name of the primary storage system is displayed.
To synchronize information about the primary and secondary storage systems in a timely manner, log in to the ISM and choose System > Refresh from the menu bar.

Other related questions:
Why cannot the initial synchronization of the LUN-based remote replication synchronize the file storage pool information?
The creation sequence of an N8500 LUN-based remote replication is to create a remote replication relationship, start initial synchronization, and then create a file storage pool. Therefore, a file storage pool is created after the synchronization process. After initial synchronization, the secondary LUN does not have the file storage pool information, and an alarm, File storage pools for replication fail to be obtained, will be generated for a disaster recovery test. Therefore, if you want to perform a disaster recovery test, start an incremental synchronization to synchronize the file storage pool information of the primary LUN to the secondary LUN.

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.

Why Are the Progresses Displayed on Two Storage Systems Not the Same During Remote Replicating?
Because the secondary array does not report the replication progress, the progress displayed on the secondary array is different from that on the primary array.

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.

Configuring remote replication for V3 series unified storage systems
See the configuration procedure in Remote Replication Feature Guide for Block, which is available at http://support.huawei.com/enterprise/docinforeader.action?contentId=DOC1000084218&idAbsPath=7919749|7941815|21430818|21462748|21041235.

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