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# Ready the migration target

Unisphere supports a migration application to provide a method for migrating data from a source array to a target array.

## Prerequisites

The migration must be in the precopy state.

See Roles and associated permissions to determine the user roles that can perform this task.

## About this task

See Understanding migration for additional information.

This operation is used on migrations that are in the Precopy state. The precopy option allows storage to be provisioned on the target array without making the host of the devices visible. This option allows the application to continue running on the source array while data is being copied to the target. The Ready Target operation results in the target devices becoming visible to the host and configures the data migration to allow simultaneous access to both the source and target devices.

## Steps

1. Select the storage system.
2. Select DATA PROTECTION > Migrations
3. Click the Storage Groups tab.
4. Select the storage group, click , and click Ready Target.
   For a migration where the source is SAN WWNs, the source field displays the serial number of the source array.
5. Review the summary and do one of the following:
   - Click Run Now to perform the operation now.
   - Expand Run Now and click Add to Job List to add this task to the job list, from which you can schedule or run the task at your convenience. For more information, see Schedule jobs and Preview jobs.

## Results

If the operation is successful, a success message displays indicating the Ready Target operation was successful and that a host discovery must be performed. The state at this stage is Migrating. Once the host discovery has been performed and all data has been synchronized between the source and target arrays, the migration state changes to Synchronized. If the operation was unsuccessful an error message displays and details the reason for the command failure. If the Ready Target operation has run to completion with a failed status, the migration has a status of 'Ready Target Failed'.