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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

Restore operations

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

Restore operations

  • Snapshots can be restored directly to the source volume or volumes from which they were created using the symsnapvx restore command or using Unisphere. Restore operations are always differential. Snapshot deltas are copied from the snapshot to the source volume, and data written to the source after the snapshot was taken is discarded.

    The symsnapvx terminate –restored command terminates the restored session only and does not break the source-to-snapshot relationship. Restoring from a snapshot to source does not affect the point-in-time of any other snapshots or linked targets.

    Restoring from a linked target back to a source is functionally possible although it is not done with a restore command. Instead, the user would take a snapshot of a linked target, which essentially creates a cascaded scenario, discussed further in the following section. The user could then use the original source volume as a linked target to the cascaded snapshot. The original source volume can be linked in nocopy mode.