Modifying a Remote Replication CG

Precautions

After the properties of a remote replication CG are modified, the properties of pairs in the CG remain unchanged. However, the working properties are consistent with those of the CG.

Procedure

1. Choose Data Protection > Protection Entities > Protection Groups > Remote Replication CGs.
2. Click More on the right of the desired remote replication CG and select Modify.

   The Modify Remote Replication CG page is displayed.

   You can also click the name of the desired remote replication CG. In the upper right corner of the page that is displayed, click Operation and then select Modify to modify the PG.

3. Modify properties of the CG.
   Table 6-2 describes the parameters.

   Table 6-2 Remote replication CG parameters

   Parameter	Description
   Name	Name of the remote replication CG. NOTE: The name must be unique. The name contains letters, digits, underscores (_), periods (.), and hyphens (-). The name can contain 1 to 31 characters.
   Description	Description of the remote replication CG. NOTE: The description can be left blank or contain up to 127 characters.
   Speed	Data synchronization speed. Possible options 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 above 100 MB/s. Custom: customized data synchronization speed. The value ranges from 1 MB/s to 1024 MB/s. NOTE: If Speed is set to Highest, check the capabilities of local and remote devices and the bandwidth of the replication link. In this mode, the service pressure may be high, and remote replication will be interrupted during the synchronization.
   Recovery Policy	Determines how data is synchronized after an internal I/O error or a replication link fault is rectified. Possible options are as follows: Manual: Data must be synchronized manually. The CG enters the To be recovered state. Automatic: The system automatically synchronizes data. The CG enters the Synchronizing state.
   Link Compression	Determines whether to perform link compression transmission during data synchronization between local and remote resources. Enabling link compression saves the bandwidth of replication links and improves replication performance. Possible values are as follows: Yes No NOTE: This parameter is available only when Replication Mode is set to Asynchronous.
   Sync Type	Determines how data is synchronized between primary and secondary resources. Possible values are as follows: Manual: Data must be manually synchronized between primary and secondary resources. 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 after the last synchronization finishes. After the time specified in Interval is reached, the system automatically starts data synchronization between primary and secondary resources again. NOTE: This parameter is available only when Replication Mode is set to Asynchronous.
   Interval	Synchronization interval for Timed wait after sync begins and Timed wait after sync ends. NOTE: This parameter is available only when Replication Mode is set to Asynchronous and Sync Type is set to Timed wait after sync begins or Timed wait after sync ends.
   Secondary LUN I/O Timeout	If data on the primary LUN fails to be written to the secondary LUN after the timeout period, the remote replication CG enters the disconnected state. NOTE: This parameter is available only when Replication Mode is set to Synchronous.
   Timeout Interval (Seconds)	The value ranges from 10 to 30 seconds. NOTE: This parameter is available only when Replication Mode is set to Synchronous and Secondary LUN I/O Timeout is enabled.

4. Click OK.

   If Speed is set to Highest, confirm the operation as prompted.