Viewing Remote Replication Pairs

Context

• On the remote replication pair management page, click to refresh remote replication pairs.
• On the remote replication pair management page, click or next to a parameter and enter a keyword or select a parameter value to search for desired remote replication pairs.
• On the remote replication pair management page, click and select desired remote replication pair parameters to be viewed.

Procedure

1. Choose Data Protection > Protection Entity > Namespace > Remote Replication Pair.
2. Select a desired account from the Account drop-down list in the upper left corner.
3. View information about an existing remote replication pair. Table 1 describes related parameters.

   Table 1 Remote replication pair parameters

   Parameter	Description
   Local Resource	Name of a local resource.
   Remote Resource	Name of a remote resource.
   ID	ID of a remote replication pair.
   Remote Device Name	Name of a remote device.
   Remote Device ESN	ESN of a remote device.
   Local Resource Role	Whether a local resource of a remote replication pair is the primary resource. If local resources are primary resources, it displays as Primary. Otherwise, it displays as Secondary.
   Health Status	Health status of a remote replication pair. Possible values are as follows: Normal: The pair is functioning normally. You can perform the synchronization operation. Fault: The primary resource or secondary resource of the pair malfunctions or the replication link is down. Therefore, you cannot perform the synchronization operation.
   Running Status	Running status of a remote replication pair. Possible values are as follows: Normal: indicates that the data synchronization of the pair is completed successfully. Synchronizing: indicates that the data of the pair is being synchronized. Split: indicates that the pair is in the split status, and the synchronization is suspended. Interrupted: indicates that the remote replication internal I/O error or the replication link is down, and you cannot perform the synchronization operation temporarily. To be recovered: indicates that after the faulty internal I/Os of the remote replication are rectified or the replication link is up, and if Recovery Policy is Manual, the pair is to be recovered. You need to manually start data synchronization for the pair. Invalid: indicates that the pair is unusable and cannot be restored in this status, except deleting it. You must delete the pair on both primary and secondary storage devices. Otherwise, the pair creation may fail.
   Replication Mode	Data replication mode. Asynchronous: After data is written to primary resources successfully, the host receives a write success response. At the same time, the primary site records 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 foreground applications.
   Recovery Policy	Whether the remote replication pair automatically synchronizes data after an internal I/O fault or a replication link fault of the remote replication is rectified. The default value is Automatic. [Value range] Automatic: The system automatically synchronizes data. The pair enters the Synchronizing state. Manual: Data must be synchronized manually. The pair enters the To be recovered state.
   Speed	Data synchronization speed of a remote replication pair. The value ranges from 1 MB/s to 10,240 MB/s (or 1024 KB/s to 10,485,760 KB/s).
   Sync Type	Data synchronization mode of the primary and secondary resources. Possible values are: 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. Specific time policy: The system automatically synchronizes data between primary and secondary resources based on a specific time policy.
   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.
   Time Policy	Specific time policy: The system automatically synchronizes data between primary and secondary resources based on a specific time policy. NOTE: This parameter is available only when Sync Type is set to Specific time policy.
   Primary Resource Data Status	Status of data in the primary resource. Data in the primary resource is always in the Consistent status.
   Secondary Resource Data Status	Status of a secondary resource. Consistent: Data in the secondary resource is a copy of the data in the primary resource (at the time when the latest successful synchronization starts). At this time, data in the secondary resource is available but not necessarily the same as the current data in the primary resource. Inconsistent: Data in the secondary resource is not a copy of the data in the primary resource (at the current point in time or at the time when the previous synchronization ends). In this state, data in the secondary resource is unavailable. You can synchronize the data to ensure data consistency between primary and secondary resources.
   Status of Secondary Resource Protection	Protection status of the secondary resource. Read-only: Data on the secondary resource can only be read. Read/Write: Data on the secondary resource can be read and written. Access prohibited: Data on the secondary resource cannot be accessed, ensuring data security of the secondary resource.
   Copy Snapshot Retention in Secondary Resource	Retention policy of copy snapshots. Possible values are: Do not retain: No copy snapshot will be created in secondary resources after pair synchronization. Retain: The system will create a copy snapshot in each secondary resource each time after pair synchronization to capture the data state of the primary resources at the time when pair synchronization starts. NOTE: A copy snapshot created under a copy snapshot retention policy in secondary resource is a replication snapshot. To view replication snapshots, choose Data Protection > Protection Entity > Namespace > Snapshot and filter snapshots by Type on DeviceManager.
   Copy Snapshots Retained in Secondary Resource	Number of copy snapshots retained in the secondary resource. When the number of copy snapshots at the secondary end exceeds the value of this parameter, the system deletes the earliest copy snapshots by default. [Value range] 1 to 512 NOTE: This parameter is available only when Copy Snapshot Retention in Secondary Resource is set to Retain. The name of a copy snapshot is prefixed by rep_copy.