Transitioning a stand-alone volume

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Transitioning a stand-alone volume involves creating a SnapMirror relationship, performing a baseline transfer, performing incremental updates, monitoring the data copy operation, breaking the SnapMirror relationship, and moving client access from the 7-Mode volume to the clustered Data ONTAP volume.

  • The cluster and SVM must already be set up.

  • You must have reviewed the information about preparing for transition.

Steps
  1. Copy data from the 7-Mode volume to the clustered Data ONTAP volume:

    1. If you want to configure the TCP window size for the SnapMirror relationship between the 7-Mode system and the SVM, create a SnapMirror policy of type async-mirror with the window-size-for-tdp-mirror option.

      You must then apply this policy to the TDP SnapMirror relationship between the 7-Mode system and the SVM.

      You can configure the TCP window size in the range of 256 KB to 7 MB for improving the SnapMirror transfer throughput so that the transition copy operations get completed faster. The default value of TCP window size is 2 MB.

      cluster1::> snapmirror policy create -vserver vs1 –policy tdp_policy -window-size-for-tdp-mirror 5MB -type async-mirror
    2. Use the snapmirror create command with the relationship type as TDP to create a SnapMirror relationship between the 7-Mode system and the SVM.

      If you have created a SnapMirror policy to configure the TCP window size, you must apply the policy to this SnapMirror relationship.

      cluster1::> snapmirror create -source-path system7mode:dataVol20 -destination-path vs1:dst_vol -type TDP -policy tdp_policy
      Operation succeeded: snapmirror create the relationship with destination vs1:dst_vol.
    3. Use the snapmirror initialize command to start the baseline transfer.

      cluster1::> snapmirror initialize -destination-path vs1:dst_vol
      Operation is queued: snapmirror initialize of destination vs1:dst_vol.
    4. Use the snapmirror show command to monitor the status.

      cluster1::>snapmirror show -destination-path vs1:dst_vol
      
                                  Source Path: system7mode:dataVol20
                             Destination Path: vs1:dst_vol
                            Relationship Type: TDP
                      Relationship Group Type: none
                          SnapMirror Schedule: -
                       SnapMirror Policy Type: async-mirror
                            SnapMirror Policy: DPDefault
                                  Tries Limit: -
                            Throttle (KB/sec): unlimited
                                 **Mirror State: Snapmirrored**
                          Relationship Status: Idle
                      File Restore File Count: -
                       File Restore File List: -
                            Transfer Snapshot: -
                            Snapshot Progress: -
                               Total Progress: -
                    Network Compression Ratio: -
                          Snapshot Checkpoint: -
                              Newest Snapshot: vs1(4080431166)_dst_vol.1
                    Newest Snapshot Timestamp: 10/16 02:49:03
                            Exported Snapshot: vs1(4080431166)_dst_vol.1
                  Exported Snapshot Timestamp: 10/16 02:49:03
                                      Healthy: true
                             Unhealthy Reason: -
                     Constituent Relationship: false
                      Destination Volume Node: cluster1-01
                              Relationship ID: 97b205a1-54ff-11e4-9f30-005056a68289
                         Current Operation ID: -
                                Transfer Type: -
                               Transfer Error: -
                             Current Throttle: -
                    Current Transfer Priority: -
                           Last Transfer Type: initialize
                          Last Transfer Error: -
                           Last Transfer Size: 152KB
      Last Transfer Network Compression Ratio: 1:1
                       Last Transfer Duration: 0:0:6
                           Last Transfer From: system7mode:dataVol20
                  Last Transfer End Timestamp: 10/16 02:43:53
                        Progress Last Updated: -
                      Relationship Capability: 8.2 and above
                                     Lag Time: -
                 Number of Successful Updates: 0
                     Number of Failed Updates: 0
                 Number of Successful Resyncs: 0
                     Number of Failed Resyncs: 0
                  Number of Successful Breaks: 0
                      Number of Failed Breaks: 0
                         Total Transfer Bytes: 155648
               Total Transfer Time in Seconds: 6
    5. Depending on whether you want to update the clustered Data ONTAP volume manually or by setting up a SnapMirror schedule, perform the appropriate action:

      If you want to…​ Then…​

      Update transfers manually

      1. Use the snapmirror update command.

        cluster1::> snapmirror update -destination-path vs1:dst_vol
      2. Use the snapmirror show command to monitor the data copy status.

        cluster1::> snapmirror show -destination-path vs1:dst_vol
                                    Source Path: system7mode:dataVol20
                               Destination Path: vs1:dst_vol
                              Relationship Type: TDP
                        Relationship Group Type: none
                            SnapMirror Schedule: -
                         SnapMirror Policy Type: async-mirror
                              SnapMirror Policy: DPDefault
                                    Tries Limit: -
                              Throttle (KB/sec): unlimited
                                   Mirror State: Snapmirrored
         ...
                       Number of Failed Updates: 0
                   Number of Successful Resyncs: 0
                       Number of Failed Resyncs: 0
                    Number of Successful Breaks: 0
                        Number of Failed Breaks: 0
                           Total Transfer Bytes: 278528
                 Total Transfer Time in Seconds: 11
      3. Go to step 3.

      Perform scheduled update transfers

      1. Use the job schedule cron create command to create a schedule for update transfers.

        cluster1::> job schedule cron create -name 15_minute_sched -minute 15
      2. Use the snapmirror modify command to apply the schedule to the SnapMirror relationship.

        cluster1::> snapmirror modify -destination-path vs1:dst_vol -schedule 15_minute_sched
      3. Use the snapmirror show command to monitor the data copy status.

        cluster1::> snapmirror show -destination-path vs1:dst_vol
                                    Source Path: system7mode:dataVol20
                               Destination Path: vs1:dst_vol
                              Relationship Type: TDP
                        Relationship Group Type: none
                            SnapMirror Schedule: 15_minute_sched
                         SnapMirror Policy Type: async-mirror
                              SnapMirror Policy: DPDefault
                                    Tries Limit: -
                              Throttle (KB/sec): unlimited
                                   Mirror State: Snapmirrored
         ...
                       Number of Failed Updates: 0
                   Number of Successful Resyncs: 0
                       Number of Failed Resyncs: 0
                    Number of Successful Breaks: 0
                        Number of Failed Breaks: 0
                           Total Transfer Bytes: 278528
                 Total Transfer Time in Seconds: 11
  2. If you have a schedule for incremental transfers, perform the following steps when you are ready to perform cutover:

    1. Use the snapmirror quiesce command to disable all future update transfers.

      cluster1::> snapmirror quiesce -destination-path vs1:dst_vol
    2. Use the snapmirror modify command to delete the SnapMirror schedule.

      cluster1::> snapmirror modify -destination-path vs1:dst_vol -schedule ""
    3. If you quiesced the SnapMirror transfers earlier, use the snapmirror resume command to enable SnapMirror transfers.

      cluster1::> snapmirror resume -destination-path vs1:dst_vol
  3. Wait for any ongoing transfers between the 7-Mode volumes and the clustered Data ONTAP volumes to finish, and then disconnect client access from the 7-Mode volumes to start cutover.

  4. Use the snapmirror update command to perform a final data update to the clustered Data ONTAP volume.

    cluster1::> snapmirror update -destination-path vs1:dst_vol
    Operation is queued: snapmirror update of destination vs1:dst_vol.
  5. Use the snapmirror show command to verify that the last transfer was successful.

  6. Use the snapmirror break command to break the SnapMirror relationship between the 7-Mode volume and the clustered Data ONTAP volume.

    cluster1::> snapmirror break -destination-path vs1:dst_vol
    [Job 60] Job succeeded: SnapMirror Break Succeeded
  7. If your volumes have LUNs configured, at the advanced privilege level, use the lun transition 7-mode show command to verify that the LUNs were transitioned.

    You can also use the lun show command on the clustered Data ONTAP volume to view all of the LUNs that were successfully transitioned.

  8. Use the snapmirror delete command to delete the SnapMirror relationship between the 7-Mode volume and the clustered Data ONTAP volume.

    cluster1::> snapmirror delete -destination-path vs1:dst_vol
  9. Use the snapmirror release command to remove the SnapMirror relationship information from the 7-Mode system.

    system7mode> snapmirror release dataVol20 vs1:dst_vol

You must delete the SVM peer relationship between the 7-Mode system and the SVM when all of the required volumes in the 7-Mode system are transitioned to the SVM.

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