Dell Unity™ Family VNX® Series Data Import to Unity All Flash or Hybrid, or UnityVSA™ System User Guide
CFS-only VDM import incremental copy
Incremental copy starts after the cutover to the target storage system. It synchronizes again the target with the source to ensure that all nodes and data that were not migrated during the intial copy phase or updated after it, are migrated to the target. During the incremental copy, all data writes to the target storage system are synchronized back to the source as well to guarantee that the data is identical between the source VDM and target NAS server. This operation ensures data integrity, no data loss, in case the migration session is cancelled after the cutover.
Pause and resume operations are supported during the incremental copy. However, only the incremental copy process can be paused, data synchronizing between the target and source is always running.
During incremental copy, quota import disables online quota check. It is resumed during import committing.
To ensure that the source is always synchronized with the target (for example, to be able to cancel the migration), any change to the target file system is first done at the source file system.
NOTE: If the modification at the source fails, the modification is not applied at the target and an error is returned to the SMB client. If the source becomes unreachable, the user data becomes unavailable from the target.
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