Backout procedure

Nondisruptive Migration User Guide

Version
9.6.0
Audience
anonymous
Part Number
MK-92RD8086-11

This procedure takes you backward through the migration procedure starting at Step 4. You should begin at the step where the migration stopped.

Step 4: Nondisruptive Migration

Return to the state before the Create Volumes task by deleting the target volume as described in When a migration job fails at Step 4: Nondisruptive Migration.

Note: If the Nondisruptive Migration step has been completed, you cannot back out of the migration (because you cannot switch back to the volumes on the source storage system).

Copy pair configuration migration task

Table. Actions to back out of copy pair configuration migration

Original task

Backout actions

N/A

Terminate the backup scripts.

Create ShadowImage Pairs

Using Replication Manager, delete the copy pairs that were created on the target storage system.

Migrate Config Files Step

  1. Using CCI, terminate the HORCM instance related to the target storage system.
  2. Copy the saved configuration definition file to the initial location. See Restoring the configuration definition file.
  3. If necessary, on CCI, start the HORCM instance related to the source storage system.

N/A

Use path management software or standard OS tool to take the target secondary volume offline.

Allocate Secondary Volumes Step

  1. If the LUN path for the target secondary volume is registered in an existing host group, delete the LUN path using Storage Navigator.
  2. If the WWN for the backup server has been added to a newly-created host group, delete the WWN for the backup server from the host group using Storage Navigator.
  3. Add the WWN for the backup server to the source storage system using Storage Navigator.

N/A

  1. Use path management software or standard OS tool to bring the source secondary volume online.

  2. If you stopped any backup scripts, restart them now.

Prepare Target Secondary Volumes Step

  1. Check the configuration using the GetStorageArray command with these parameters:
    subtarget=LogicalUnit
    lusubinfo=LDEV

    Example: GetStorageArray

  2. Delete the label for the target secondary volume using the DeleteLabel command.

    Example: DeleteLabel

  3. Delete the host group.

    This returns to the state before Set Paths for Target Secondary Volumes.

  4. Delete the target secondary volume.

    This returns to the state before Create Target Secondary Volumes.

  5. Delete the virtual ID.

    This returns to the state before Add Virtual ID.

Step 3: Unallocate Source Volumes

  1. Change the cache mode to "cache through" (through).

    This corresponds to the operation to return to the state before Change Cache Mode.

  2. Add the LUN path for the source volume.

    This corresponds to the operation to return to the state before Delete LUN Paths.

Step 2: Change Host I/O Paths

Using path management software or standard OS tool, follow these steps:

  1. Bring the source volume online.
  2. Take the target volume offline.

Step 1: Virtualize and Allocate Volumes

  1. Check the configuration using the GetStorageArray command with these parameters:
    subtarget=LogicalUnit
    lusubinfo=LDEV

    Example: GetStorageArray

  2. Delete the label for the target volume using the DeleteLabel command.

    Example: DeleteLabel

  3. Delete the LUN path for the target volume.

    This returns to the state before Allocate Target Volumes.

  4. Unvirtualize the source volume.

    This return to the states before Virtualize Source Volumes.

  5. Delete the virtual ID.

    This returns to the state before Add Virtual ID.

  6. Delete external paths.

    This returns to the state before Set External Paths.