After the migration start operation is complete, the migration cutover operation can be performed. You can access the vFiler unit on the new destination storage system. You will no longer have access to the vFiler unit on the source storage system. If you initiate data migration, you can enable the cutover operation to occur automatically rather than manually at the end of the start migration operation.
Before performing the data source cutover to the new destination,
the NetApp Management Console provisioning capability verifies that the following is true:
- The IP addresses of the source vFiler unit are not in use in the same IP space in the destination storage system.
- No error occurred in the last update on any of the SnapMirror or synchronous SnapMirror relationships involved in migration.
- If online migration is not enabled, all applications that use the dataset or vFiler unit are shut down.
- If the online migration option is enabled, both the source storage system and the destination storage system have the snapmirror_sync license and are running compatible Data ONTAP versions. (The snapmirror_sync license is free if the SnapMirror license is installed.)
- The destination storage system has the licenses for all allowed protocols on the vFiler unit.
- The aggregates hosting the destination volumes have enough space.
- All the volumes that belong to the source vFiler units have SnapMirror or synchronous SnapMirror relationships to the destination volumes.
- Current CPU utilization on the source storage system and the destination storage system does not exceed 65 percent.
If CPU utilization is between 65 percent and 90 percent, the following condition should be satisfied to proceed with the cutover operation:
(1-V)*U + C*V < 90
where, V is the percentage of CPU utilization for the migrating vFiler unit, U is the CPU utilization of system, and C is the cost factor. The default value for cost factor is 2, and minimum value is 1.
If CPU utilization exceeds 90 percent, then the NetApp Management Console provisioning capability reverts all changes, and you have to perform the cutover operation to the new destination storage system again.
- Current disk utilization of the selected aggregates on the destination storage system does not exceed 70 percent.
Note: If any of these items is not true, the migration cutover operation is not performed and an error message is displayed.
When all checks have passed, using
the NetApp Management Console provisioning capability, the following tasks are performed:
- Changes the corresponding SnapMirror relationships to synchronous mode if the vFiler volumes belong to datasets with the online migration option enabled, and waits for the relationships to synchronize.
- Runs the specified script
If a script is specified as part of the destination switch operation and it contains premigration operations, they are executed before the cutover is performed.
If a script is specified as part of the destination switch operation and it contains cutover operations, they are executed during the cutover operation. (This is useful when you have a script to quiesce an application.)
If the script contains postmigration operations, they are executed after the cutover is performed. (This is useful when you have a script to resume an application.)
- Switches data access from the original source vFiler unit to the new destination vFiler unit and deletes the source vFiler unit.
The new destination vFiler unit becomes active, writable, and online.
- Suspends the datasets to prevent new backups from starting during the migration.
- Removes volumes from the source dataset
As each volume is added to the new destination, the source volume is removed from the source dataset. Dynamic references in the source dataset are not removed; you must remove them after the migration cleanup operation finishes.
- Modifies the backup version tables to point to the new primary storage.
- Modifies all backup and mirror relationships to point to the new primary storage.
- Copies the history data in Operations Manager to reflect the new primary storage.
- Resumes the dataset operation.
When the cutover operation is finished, you can restart any application that was shut down before the migration.
The NetApp Management Console provisioning capability responds to failures as follows: