# Creating a Mapping for the Migrated LUN

Use the 3PARMigratedLunMap additional setting to identify the correct HPE Alletra Storage MP/ Primera / HPE Alletra 9000 Series / HPE Alletra Storage MP B10000 storage array for migrated volumes.

The additional setting creates a migrated LUN mapping that stores the association between the LUN and the storage array to which you migrated the LUN.

## Procedure

To the client computer, where the snapshot backup operation runs, add the 3PARMigratedLunMap additional setting as shown in the following table.

For instructions on adding additional settings from the CommCell Console, see Adding or Modifying Additional Settings from the CommCell Console.

Property | Value
--- | ---
Name | 3PARMigratedLunMap
Category | iDataAgent
Supported Values | MAP-String

where:

Map-String denotes a string that contains the LUN WWN and the storage array ID, separated by the pipeline character.

Example:

For n migrated LUNs:

3PARMigratedLunMap1 :: 50002AC00065146C|2FF70002AC012204

3PARMigratedLunMap2 :: 50002AC00064146C|2FF70002AC012204

...

3PARMigratedLunMapn :: 50002AC00065146C|2FF70002AC012204

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