Preparing Snapshot copies before reverting

Before reverting to an earlier ONTAP release, you must disable all Snapshot copy policies and delete any Snapshot copies that were created after upgrading to the current release.

1. Disable Snapshot copy policies for all data SVMs: volume snapshot policy modify -vserver * -enabled false
2. Disable Snapshot copy policies for each node's aggregates:
   1. Identify the node's aggregates by using the run -node nodename aggr status command.
   2. Disable the Snapshot copy policy for each aggregate: run -node nodename aggr options aggr_name nosnap on
   3. Repeat this step for each remaining node.
3. Disable Snapshot copy policies for each node's root volume:
   1. Identify the node's root volume by using the run -node nodename vol status command.

      You identify the root volume by the word root in the Options column of the vol status command output.

      Example

      vs1::> run -node TDC-7K-01 vol status
      
               Volume State           Status            Options
                 vol0 online          raid_dp, flex     root, nvfail=on
                                      64-bit
      
      
   2. Disable the Snapshot copy policy on the root volume: run -node nodename vol options root_volume_name nosnap on
   3. Repeat this step for each remaining node.
4. Delete all Snapshot copies that were created after upgrading to the current release:
   1. Set the privilege level to advanced: set -privilege advanced
   2. Disable the snapshots:snapshot policy modify -vserver * -enabled false
   3. Delete the node's newer-version Snapshot copies: volume snapshot prepare-for-revert -node nodename

      This command deletes the newer-version Snapshot copies on each data volume, root aggregate, and root volume.

      If any Snapshot copies cannot be deleted, the command fails and notifies you of any required actions you must take before the Snapshot copies can be deleted. You must complete the required actions and then rerun the volume snapshot prepare-for-revert command before proceeding to the next step.

      Example

      TDC-DM7K::*> volume snapshot prepare-for-revert -node TDC-7K-01
      
      Warning: This command will delete all Snapshot copies that have the format used by the current version of ONTAP. It will fail if any Snapshot copy polices are enabled, or
               if any Snapshot copies have an owner. Continue? {y|n}: y
      
      
   4. Verify that the Snapshot copies have been deleted: volume snapshot show -node nodename

      If any newer-version Snapshot copies remain, force them to be deleted: volume snapshot delete {-fs-version 9.0 -node nodename -is-constituent true} -ignore-owners -force
   5. Repeat this step c for each remaining node.
   6. Return to the admin privilege level: set -privilege admin
   Note

   You must perform these steps on both the clusters in MetroCluster configuration.