Creating a HyperMetro Pair

Prerequisites

• The local and remote devices work normally and correctly communicate with each other.
• The local and remote devices support HyperMetro.
• A storage pool has been created on the remote storage system.
• The remote LUN has not been mapped to a host.
• You cannot create a HyperMetro pair for a LUN if a remote replication pair has been created for this LUN and the HyperMetro pair you want to create uses the same remote device as this remote replication pair.

Context

• After a HyperMetro pair is created successfully, the WWN of the remote LUN is changed to that of the local LUN.
• You only need to perform this operation on the local storage system.

Procedure

1. Choose Services > Block Service > LUNs.
2. Select the desired LUN, click Protect, and select Create HyperMetro.

   The Create HyperMetro Pair page is displayed.

3. Select a HyperMetro domain in which you want to create a HyperMetro pair.
4. Set Pair Creation to Automatic.
   • If you set Pair Creation to Automatic, the storage system automatically creates a remote LUN in the storage pool of the remote device and creates a HyperMetro pair for the selected local and remote LUNs.
   • If you set Pair Creation to Manual, you must manually create a remote LUN and add the LUNs to the pair.

5. Select the target storage pool for creating remote resources of HyperMetro.
6. (Optional) Select Advanced in the upper right corner and set the advanced parameters.

   By default, Speed is Medium, Recovery Policy is Automatic, and Initial Sync is Automatic.

   Table 10-5 describes the parameters.

   Table 10-5 Advanced properties of a HyperMetro pair

   Parameter	Description
   Speed	Data synchronization speed of the HyperMetro pair. Possible values are as follows: Low: 0 to 5 MB/s. At this setting, data synchronization takes a long period. This value is used when the service load is heavy. Medium: 10 MB/s to 20 MB/s. At this setting, data synchronization takes a relatively short period. This value is used when the service load is relatively heavy. High: 20 MB/s to 70 MB/s. At this setting, data synchronization takes a short period. This value is used when the service load is relatively light. Highest: Above 100 MB/s. At this setting, data synchronization takes a very short period. This value is used when the service load is light. Custom: User-defined synchronization speed. The value ranges from 1 MB/s to 1024 MB/s.
   Recovery Policy	Determines how data is synchronized after a fault is rectified. Automatic: The system automatically synchronizes data. Manual: Data must be synchronized manually.
   Initial Sync	Initial synchronization mode of local and remote resources. When Pair Creation is set to Automatic, the value can be: Automatic: The system automatically synchronizes data between the local and remote resources upon pair creation. Manual: Data must be manually synchronized between the local and remote resources. When Pair Creation is set to Manual, the value can be: If data is inconsistent: Automatic: The system automatically synchronizes data between the local and remote resources upon pair creation. Manual: Data must be manually synchronized between the local and remote resources. If data is consistent, synchronization is not required.

   It is recommended that you perform synchronization tests for different speeds and select a proper speed based on the test result. Choose a faster speed as long as the bandwidth is sufficient.

7. Click Next.

   A summary is displayed.

8. Confirm the HyperMetro information and click OK.

   Confirm your operation as prompted.