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The environment remove operation removes the replication pathway configured by the environment setup operation and removes the resources that were configured to support NDM on the source and target arrays. On successful completion of an environment remove operation, only running an environment setup operation is allowed. An environment removal operation should occur only after all migrations from the source array have been completed.
The following figure shows the steps involved in removing a migration environment between arrays.
Once the environment remove operation is complete, the NDM process is complete. Figure 13 shows the summary screen of the steps performed in the removal task from Unisphere.
Deleting a migration environment with REST API is a DELETE method GET call, as shown below, expected response for success is 204 response code.
NDM migrates data and cuts over to the target array non-disruptively by swapping device IDs between the source and target devices and manipulating the data paths from the host to the arrays. Devices presented from the storage array are identified by the host operating system by their unique WWN, the device also has other meta data stored in its descriptor fields, such as a device identifier that the user has assigned to a device through Solutions Enabler or Unisphere this information is preserved as data is copied to new array.
NDM performs the data migration and device ID swap without impact to the applications accessing the data. On the host, changes appear as either the addition of paths or the removal of paths to the existing source device multipathing software ensures that this is transparent to the applications. To the host and application, the change in the device is non disruptive throughout the entire migration process. Working examples of the device ID manipulation and pathing changes to expect is described in the walkthrough sections later in this paper.