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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

Creating snapshots

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

Creating snapshots

  • TimeFinder SnapVX allows snapshots to be taken without the use of a target volume. The snapshots are made as efficient as possible by sharing point-in-time tracks, which are called snapshot deltas. The snapshot deltas are stored directly in the Storage Resource Pool (SRP) where the source volume resides. Each snapshot references the snapshot deltas appropriate for the specific point-in-time image.

    SnapVX Snapshots are created with the symsnapvx establish command. As part of the establish command the user provides a name for the snapshot. The name has up to 32 characters and can contain letters, digits, dashes, and underscores. The name is not case-sensitive.

    The following figure shows a volume with three targetless snapshots.

    Figure 1.   Production volume with three targetless snapshots