Determining which I/O ports are available for paths using DS CLI

Complete this task to determine which I/O ports are available for paths between the source and target LSSs.

Before you begin with this task, ensure that the following guidelines are met:

The remote mirror and copy license key is installed and enabled to allow operations to be performed.
The fibre-channel I/O ports are configured. .
The I/O ports that will be used for paths are available and identified. .
The WWNN of the storage unit is identified because it is a required parameter for this task.

Before you create paths, use this task to determine which ports are available for remote mirror and copy (formerly PPRC) I/O operations. These are the ports through which data will be transferred so it essential that bandwidth for these operations be sufficient. In addition, you want to ensure that the ports used for remote mirror and copy operations are not the same ones that will be used for host I/O activity.

You need to determine which source and target I/O ports are available for paths on the local and remote storage units. The output that is generated from this task displays fibre channel protocol (FCP) I/O ports that are available to be used as remote mirror and copy paths.

Note: When you establish FCP paths, the LSSs on the source and target storage units can be connected either through a point-to-point connection (no switch) or through a switched fabric. For fibre-channel attachments, you can establish zones to help reduce the possibility of interactions between system adapters in switched configurations. For information, see the fibre channel switches publication that is available for your environment.

Perform the following steps to determine the available I/O ports with DS CLI commands. The example commands in this task are shown in two formats. The first format shows the type of information that the command requires. The second format provides the command with values declared for the variables.

Issue the lsavailpprcport command to display a list of available I/O ports that are available for paths. Enter the lsavailpprcport command at the dscli command prompt with the parameters and variables shown as follows:
dscli>lsavailpprcport -dev storage_image_ID -remotedev storage_image_ID -remotewwnn wwnn source_LSS_ID:target_LSS_ID
Notes:
1. The -remotedev parameter specifies the ID of the secondary storage unit.
2. The -remotewwnn parameter must specify the worldwide node name of the secondary storage unit. If you make a mistake and specify the worldwide node name of the primary storage unit, the command fails.
3. The shortened version of the source_LSS_ID:target_LSS_ID parameter is shown (value = 01:01) because the example uses the fully qualified -dev storage_image_ID and -remotedev storage_immage_ID parameters. If the fully qualified -dev and -remotedev parameters were not used, you must use the fully qualified source_LSS_ID:target_LSS_ID value. For example: IBM.1750-68FA120/01:IBM.1750-68FA150/01
  The fully qualified source_LSS_ID:target_LSS_ID value must be placed after the -remotewwnn value in your command line. For example, your command line would look like the following:
```
dscli>lsavailpprcport –l –remotewwnn 12341234000A000F 
IBM.1750-68FA120/01:IBM.1750-68FA150/01
```
Example
```
dscli>lsavailpprcport –l –dev IBM.1750-68FA120
 -remotedev IBM.1750-68FA150 –remotewwnn 12341234000A000F 01:01
```
Analyze the output that is generated and select from the available I/O ports to create the path. The information that is displayed shows available I/O ports combinations between the source LSSs and the target LSSs and the output depends on the current selection of adapters.