Modifying a Remote Replication Pair

Precautions

The properties of a remote replication pair which has been added to a CG cannot be modified.

Procedure

1. Choose Data Protection > Protection Entities > LUNs > Remote Replication Pairs.
2. Click More on the right of the remote replication pair that you want to modify and select Modify.

   The Modify Remote Replication Pair page is displayed on the right.

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

3. Modify properties of the remote replication pair.
   Table 5-2 describes the parameters.

   Table 5-2 Remote replication pair parameters

   Parameter	Description
   Speed	Data synchronization speed. 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 above 100 MB/s. Custom: customized 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 values are as follows: Manual: Data must be synchronized manually. The pair enters the To be recovered state. Automatic: The system automatically synchronizes data. The pair enters the Synchronizing state.
   Link Compression	Indicates whether data is compressed during data synchronization between primary and secondary 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 as soon as the latest synchronization ends. 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 pair enters the disconnected state. NOTE: This parameter is available only when Replication Mode is set to Synchronous.
   Timeout Threshold (Seconds)	The value ranges from 10 to 30 seconds. NOTE: The 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.