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Offline migration of vFiler units

Data ONTAP supports two methods of offline migration. Data from a source vFiler unit is copied to a destination vFiler unit by using SnapMirror. Alternatively, vFiler units can be migrated between the storage systems in an HA pair by using the vfiler migrate -m nocopy command. During offline migration, users cannot access data from the vFiler units.

The period of time from when the source vFiler unit becomes inaccessible and the destination vFiler unit becomes available is called the cutover period.

The cutover period duration increases with the number of volumes owned by the vFiler unit. Because users and other applications cannot access the vFiler unit that is being migrated during the cutover period, offline migration is disruptive.