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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

Source-volume or linked-target SRP relationships

Home > Storage > PowerMax and VMAX > Data Protection > Dell EMC PowerMax and VMAX All Flash: TimeFinder SnapVX Local Replication > Source-volume or linked-target SRP relationships

Source-volume or linked-target SRP relationships

  • Source volumes and linked targets can be associated either to the same or separate SRPs. Single SRP systems are recommended because they are easier to manage, and performance may be better when spreading workloads across all available resources in the array. Also, the Reserved Capacity setting in HYPERMAX OS allows the user to limit the amount of storage in the SRP that the replicas can consume, eliminating the need to physically separate production volumes and their replicas (snaps and clones).

    Note: SRP count and configuration need to be specified during the system ordering process.

    Snapshot deltas will always be stored in the source volume’s SRP. There is no advantage to having nocopy linked targets in a separate SRP because writes to a source volume will only create snapshot deltas and will not initiate a copy to target.

    If opting for a separate SRP for copy mode linked targets, the target SRP must have enough disks to support the expected capacity and performance requirements of the target volumes.

    A single snapshot can have both copy and nocopy linked targets. All linked targets from a single snapshot do not need to be in the same SRP. Source volumes and linked targets (copy and nocopy modes) can be moved between SRPs while TimeFinder sessions are active; FAST will move allocations accordingly.