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VNX Block Local Replication Principles

VNX Block Local Replication Principles. Upon completion of this module, you should be able to: Explain the business cases for VNX block local replication List VNX SnapView and VNX Snapshot basic terminology Explain operating principles for the following: VNX SnapView VNX Snapshot.

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VNX Block Local Replication Principles

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  1. VNX Block Local Replication Principles Upon completion of this module, you should be able to: Explain the business cases for VNX block local replication List VNX SnapView and VNX Snapshot basic terminology Explain operating principles for the following: VNX SnapView VNX Snapshot VNX Block Local Replication Principles

  2. VNX Block Local Replication Business Cases • Primary goals • Creation of point-in-time copies of data • Support for consistent on-line backup or data replication • Offload backup and other processing from production hosts • Data copies can be used for purposes other than backup • Testing, decision support scenarios, local data migration • A successful recovery requires that consistent data was written to the backup media • SnapView supports consistency for Snapshots and clones • VNX Snapshots support Consistency Groups VNX Block Local Replication Principles

  3. SnapView Overview • SnapView Snapshots • Use pointer-based replication and Copy on First Write technology • Make use of a Reserved LUN Pool to save data chunks • Have three managed objects: Snapshot, Session, Reserved LUN Pool • SnapView Clones • Make full copies of the Source LUN (Classic, Thick , or Thin) • Track changes to Source LUN and Clones in the Fracture Log • Have three managed objects: Clone Group, Clone, Clone Private LUN • SnapView Snapshots and SnapView Clones are managed by • Unisphere • Navisphere Secure CLI • Admsnap VNX Block Local Replication Principles

  4. SnapView Terminology VNX Block Local Replication Principles

  5. SnapView Terminology (continued) VNX Block Local Replication Principles

  6. SnapView Features • SnapView enabler allows use of Snapshots and Clones • Snapshots and Clones have high availability features • Resilient to SP and path failures (if PowerPath is installed), LUN trespasses, and non-disruptive upgrades • Multiple point-in-time copies allowed • Restore to Source LUN capability • Primary host sees changes immediately • Minimal disruption to production data processing • Consistency of data across multiple objects • Consistent session start, consistent clone fracture • Simplified management with wizards VNX Block Local Replication Principles

  7. SnapView Technologies Comparison • Access to point-in-time copy • Snapshot data is immediately available for use • Clones need an initial full synchronization, which is time-consuming • Performance impact on Source LUN • Snapshots use Copy on First Write, which increases response times • Fractured Clones are independent of their Source LUNs • Use of disk space • A Snapshot uses around 20% of the space of its Source LUN • A Clone occupies the same amount of space as its Source LUN • Recovery from Source LUN loss or corruption • Snapshots depend on a Source LUN for operation • Clones can be completely independent of the Source LUN VNX Block Local Replication Principles

  8. SnapView Snapshot Limits VNX Block Local Replication Principles

  9. SnapView Clone Limits VNX Block Local Replication Principles

  10. VNX Snapshot Overview • VNX Snapshots • Use pointer-based replication and Relocate on First Write (ROW) technology • Make use of the source LUN’s parent Pool to store original data • Have three managed objects: Snapshot, Snapshot Mount Point, Consistency Group • VNX Snapshots are managed by • Unisphere • Navisphere Secure CLI • Unisphere SnapCLI VNX Block Local Replication Principles

  11. VNX Snapshot Terminology VNX Block Local Replication Principles

  12. VNX Snapshot Features • VNX Snapshot enabler allows use of VNX Snapshots • Multiple point-in-time copies allowed • Restore to Primary LUN capability • Primary host sees changes immediately • Minimal disruption to production data processing • Consistency of data across multiple objects • Consistency groups VNX Block Local Replication Principles

  13. VNX Snapshot Limits VNX Block Local Replication Principles

  14. VNX Snapshot and SnapViewSnapshot Comparison VNX Block Local Replication Principles

  15. VNX Snapshot and SnapView Snapshot Features VNX Block Local Replication Principles

  16. Summary Key points covered in this module: • VNX block local replication business cases • VNX SnapView and VNX Snapshot basic terminology • VNX SnapView Snapshot operating principles • VNX Snapshot operating principles • VNX SnapView Clone operating principles VNX Block Local Replication Principles

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