Creating a Metro Mirror relationship using DS CLI

Complete this task to create a Metro Mirror relationship between a source volume and target volume.

Before you begin, ensure that you have met the following conditions:

The remote mirror and copy license key is installed and enabled to allow operations to be performed. If you are using a Model 2105 ESS as part of the configuration, ensure that you have enabled PPRC Version 2 license.
The I/O ports are configured for paths between source and target LSSs.
The fibre-channel paths are created between all Metro Mirror source and target LSSs. The paths are required for communication between the volume pairs and to copy data from the source volumes to the target volumes. Otherwise, this task fails.

Metro Mirror is a function of a storage server that constantly updates a target copy of a volume to match changes made to a source volume. The source and target volumes can be on the same storage unit or on separate storage units. Metro Mirror creates the remote mirror and copy relationship in a synchronous manner.

Metro Mirror functions run on the DS6000™ storage unit and are supported on many operating systems. For example, if you set up and configure your DS6000 to use i5/OS^®, you can use Metro Mirror to create a copy of a System i™ disk pool on a separate DS6000, typically in a remote location.

Perform the following steps to create Metro Mirror relationships between the source volumes and target volumes.

Issue the lsfbvol command (for fixed blocked (FB) volumes) or the lsckdvol command (for count key data (CKD) volumes) to display which volumes are available for Metro Mirror relationships on the source and target LSSs. A report is displayed that shows the availability of the volumes.
Issue the mkpprc command to create a Metro Mirror relationship between a source volume and a target volume.
The mkpprc command must contain the following parameters and variables: dscli>mkpprc -dev storage_imag_ID -remotedev storage_image_ID -type mmir SourceVolumeID:TargetVolumeID.
Note:
- The -remotedev parameter specifies the ID of the secondary storage unit.
- The -type mmir parameter specifies that you want to establish one or more Metro Mirror volume relationships. Metro Mirror creates the remote mirror and copy relationship in a synchronous manner.
- The shortened version of the SourceVolumeID:TargetVolumeID parameter is shown (value = 0100:0100) because the example uses the fully qualified -dev storage_image_ID and -remotedev storage_image_ID parameters. If the fully qualified -dev and -remotedev parameters were not used, you must use the fully qualified SourceVolumeID:TargetVolumeID value. For example: IBM.1750-68FA120/0100:IBM.1750-68FA150/0100 .
Example
```
dscli>mkpprc -dev IBM.1750-68FA120 -remotedev IBM.1750-75FA150 -type mmir
 0100:0100
```
A confirmation message is issued for each successful Metro Mirror volume association that is created.
Issue the lspprc command to view the status information of each Metro Mirror relationship in the list. Enter the lspprc command at the dscli command prompt with parameters and variables as follows:
dscli>lspprc -dev storage_image_ID -remotedev storage_image_ID -s SourceVolumeID:TargetVolumeID.
```
dscli>lspprc -dev IBM.1750-68FA120 -remotedev IBM.1750-68FA150 -s 0100:0100
0101:0101  
```