Viewing a Remote Replication CG

Context

• On the remote replication CG management page, click to refresh the information about the remote replication CGs.
• On the remote replication CG management page, click or next to a parameter, and enter a keyword or select a value to search for the desired remote replication CGs.
• On the remote replication CG management page, click and select remote replication CG information you want to view.

Procedure

1. Choose Data Protection > Protection Entities > Protection Groups > Remote Replication CGs.

   Alternatively, perform any of the following operations to view the remote replication CG information:

   • Choose Services > Block Service > LUN Groups. Click the name of the desired LUN group. On the page that is displayed on the right, click the Protection tab, and then select Remote Replication from the drop-down list.
   • Choose Data Protection > Protection Entities > Protection Groups > Protection Groups. Click the name of the desired PG. On the page that is displayed on the right, click the Protection tab, and then select Remote Replication from the drop-down list.
   • Choose Data Protection > Protection Entities > Protection Groups > Protection Groups. If the value of Remote Replication CGs is not 0, click the value.

2. In the function pane, view the remote replication CG information. Table 6-1 describes the parameters.
   Table 6-1 Parameters of a remote replication CG

   Parameter	Description
   Name	Name of a clone CG. NOTE: You can click the name of a remote replication CG to view its details and manage it.
   ID	ID of a CG.
   Health Status	Health status of a remote replication CG. Possible values are Normal, Faulty, and Invalid.
   Running Status	Running status of a snapshot CG. Possible values are as follows: Normal: Data in the CG at two sites has been synchronized. Synchronizing: Data of the CG is being synchronized. Split: The CG is in the split state, and data synchronization is suspended. Interrupted: The remote replication internal I/O error or the replication link is down, and you cannot perform the synchronization operation temporarily. To be recovered: After the remote replication internal I/O error is rectified or the replication link is up, and if Recovery Policy is set to Manual, the CG enters this state. You need to manually start data synchronization for the CG. Invalid: The CG cannot be used and restored. You can only delete the CG. When you delete a CG, you need to do it on both ends. Otherwise, you may fail to create any after the deletion. Standby: A standby asynchronous remote replication CG functions as the secondary resource in a DR Star trio.
   Local PG	Name of the local PG.
   Remote PG	Name of the remote PG.
   Remote Device ESN	Serial number of the remote device.
   Replication Mode	Data replication mode of a remote replication CG. Possible values are as follows: Synchronous: When data is written to the primary resource, the write request is also sent to the secondary resource. The host receives a write success message only after the data is written to both primary and secondary resources successfully, ensuring that data on the primary resource and secondary resource is synchronized in real time. Asynchronous: After data is written to the primary resources successfully, the host receives a write success message. Meanwhile, the primary site records the differences between the written data and the secondary resource data. Then the changed data recorded by the primary site is synchronized to the secondary site, minimizing the write latency for upper-layer applications.
   Local Resource Role	Indicates whether local resources of a remote replication pair in a CG are primary resources. If the local resource is the primary resource, it displays as Primary. Otherwise, it displays as Secondary.
   Speed	Data synchronization speed of a CG. Possible values are as follows: Low: Data synchronization takes a relatively long period of time. This value is used when the service load is heavy. The speed is normally from 0 MB/s to 5 MB/s. Medium: Data synchronization takes a relatively short period of time. This value is used when the service load is relatively heavy. The speed is normally from 10 MB/s to 20 MB/s. High: Data synchronization takes a short period of time. This value is used when the service load is relatively light. The speed is normally from 20 MB/s to 70 MB/s. Highest: Data synchronization takes the shortest period of time. This value is used when the service load is light. The speed is normally higher than 100 MB/s. If Speed of a remote replication CG is set to Custom, the customized data synchronization speed is displayed. The value ranges from 1 MB/s to 1024 MB/s.
   Sync Type	Data synchronization mode of a CG. Possible values are as follows: Manual: Data is synchronized manually. Timed wait after sync begins: The system starts timing after the last synchronization begins. After the time specified in Interval is reached, the system automatically starts data synchronization between primary and secondary resources again. NOTE: If the last synchronization has not finished after the time specified in Interval is reached, the system performs the next synchronization after the last synchronization finishes. Timed wait after sync ends: The system starts timing as soon as the latest synchronization ends. After the time specified in Interval has elapsed, the system starts data synchronization again.
   Interval	Synchronization interval for Timed wait after sync begins and Timed wait after sync ends. NOTE: This parameter is available only when Sync Type is set to Timed wait after sync begins or Timed wait after sync ends.
   Recovery Policy	Whether data is automatically synchronized within the remote replication pair after the remote replication internal I/O error is rectified or the replication link is up. Possible options are as follows: Manual: The CG enters the To be recovered state. You need to manually synchronize the data from the primary resource to the secondary resource. Automatic: The system automatically synchronizes data. The CG enters the Synchronizing state.
   Secondary LUN I/O Timeout Interval	If data on the primary LUN fails to be written to the secondary LUN after the timeout interval, the remote replication CG enters the disconnected state. NOTE: This parameter is available only when Replication Mode is set to Synchronous.
   Link Compression	Indicates whether data is compressed during data synchronization for the CG. Enabling link compression saves the bandwidth of replication links and improves replication performance. Possible options are as follows: Yes No NOTE: This parameter is available only when Replication Mode is set to Asynchronous.
   Compression Status	If the status displays as Valid, data compression transmission is available for remote replication. If the status displays as Invalid, data compression transmission is not available or data compression transmission is not selected for remote replication. NOTE: This parameter is available only when Replication Mode is set to Asynchronous.
   Sync Start Time	Start time of data synchronization between the primary and secondary resources.
   Sync End Time	End time of data synchronization between the primary and secondary resources.
   DR Star Trio ID	ID of the owning DR Star trio.