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Dell EMC PowerMax and VMAX All Flash: TimeFinder SnapVX Local Replication
Executive summary Introduction TimeFinder SnapVX overview
Creating snapshots
Generation numbers
Time-to-live value
Host writes to source
Redirect-on-write
Replication cache
Shared allocations
Linking target volumes to snapshots
Relinking
Unlinking
Defining state
Linking a larger target
Source-volume or linked-target SRP relationships
Restore operations
Cascading snapshots
Reserved capacity
Interoperability
Storage group operations
Secure snaps
Online device expansion
Role Based Access Controls
Implementing TimeFinder SnapVX PowerMaxOS Q3 2020 release enhancements TimeFinder legacy modes: Mirror, Clone, and VP Snap Conclusion Appendix A: TimeFinder SnapVX state table Appendix B: Geometry compatibility mode Appendix C: Monitoring the copy process Appendix D: Nocopy Linked Target behavior before HYPERMAX OS 5977.810.184 Appendix E: Scheduling snapshots with Unisphere for PowerMax Appendix F: System resource planning for capacity and performance Appendix G: Technical support and resources

Unlinking

Home > Storage > PowerMax and VMAX > Data Protection > Dell EMC PowerMax and VMAX All Flash: TimeFinder SnapVX Local Replication > Unlinking

Unlinking

  • The unlink command breaks the relationship between a snapshot and a linked target. Copy mode linked targets can be unlinked once copying is complete and retain a full, usable point-in-time copy of the source volume.

    When a nocopy linked target is unlinked, the operation does not deallocate any data on the target. This includes data that was copied during the link operation as well as data that was directly written to the target. Therefore, an unlink operation does not return any free capacity to the SRP.

    If the user wants to deallocate the data on the target or targets after unlinking, they can do so by issuing the symdev free –all command to the target volume.

    Note: This is a powerful command that completely deallocates all data on the volumes that it is issued against. Take extreme care when using this command. As a safety mechanism, the free –all command requires the device to be not ready or unmapped.

    A target volume that has cascaded snapshots can be unlinked once the target has completely copied (copy mode) or fully defined (nocopy mode).

    Note: Before HYPERMAX OS 5977.810.184, a nocopy linked target that has a cascaded snapshot or snapshots cannot be unlinked. The user needs to set mode to copy, then unlink after copy has completed. This is no longer required as of the HYPERMAX OS 5977.810.184.