Step 3: Unallocate source volumes

Nondisruptive Migration User Guide

Part Number

Delete the source storage system LUN paths for hosts with migration source volumes, and change the cache mode on the target storage system.

Host I/O paths must be online for the target storage system and offline for the source storage system.

  1. On the Mobility tab, select Migration Projects.
  2. Expand the tree for a source storage system, and select a migration job.
  3. On the Data Migration Workflow tab, click Execute for Step 3: Unallocate Source Volumes.
    Note: To resume performing a step on one or more migration job resources, for example, resources with a failed step task or sub-task, select the resources, and from the Data Migration Actions menu, select the step to resume.
  4. Verify the source LUN path information.
    The target storage system cache mode is automatically changed from Through to Write Sync to forward write I/O to the source storage system volume.
  5. (Optional) Update the task name and provide a description.
  6. (Optional) Expand Schedule to specify the task schedule.
    You can schedule the task to run immediately or later. The default setting is Now. If the task is scheduled to run immediately, you can select View task status to monitor the task after it is submitted.
  7. Click Submit.
    If the task is scheduled to run immediately, the process begins.
  8. Confirm this task is Completed for the migration job.
Source volumes are unallocated from the host, the cache mode is set to Write Sync, and host I/O continues to update the source volume.

If you are migrating copy pair configurations, follow the copy pair configuration migration workflow before continuing to Step 4: Nondisruptive Migration. Alternatively, you can perform the copy pair configuration migration workflow after nondisruptive migration (step 4) is complete for the P-VOL, but before you unvirtualize the source volumes (step 5).