Copyright © 2014 EMC Corporation. All Rights Reserved. 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 Principles1

Copyright © 2014 EMC Corporation. All Rights Reserved. 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 Principles2

Copyright © 2014 EMC Corporation. All Rights Reserved. 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 Principles3

Copyright © 2014 EMC Corporation. All Rights Reserved. SnapView Terminology TermDefinition Production host  Server where customer applications are executed  Source LUNs are accessed from the production host Backup (secondary) host  Host where backup processing occurs  Offloads backup processing from production host  Snapshots and clones are accessed from backup host Admsnap utility  An executable program that runs interactively or with a script to manage clones and snapshots  Resides on the servers connected to the storage system Source LUNProduction LUN – the LUN from which replicas are made ActivateMaps a snapshot to an available snapshot session SnapshotA point-in-time copy of a Source LUN Reserved LUN Pool (RLP)  Private area used to contain Copy on First Write (CoFW) data  Total number of Reserved LUNs is limited VNX Block Local Replication Principles4

Copyright © 2014 EMC Corporation. All Rights Reserved. SnapView Terminology (continued) TermDefinition Snapshot sessionDefines a point-in-time designation by invoking CoFW activity for updates to the Source LUN Snapshot session name Name for a session that is used for subsequent operations (sessions should have meaningful names) ChunkGranularity at which data is copied from the Source LUN to a reserved area Copy on First Write (CoFW) When a chunk is changed on the Source LUN for the first time, data is copied to a reserved area Fracture  The process of breaking off a clone from its source  Once a clone is fractured, it can receive server I/O requests Clone groupContains a Source LUN and all of its clones Clone private LUNsUsed for recording information that have been modified on the Source LUN and clone LUN that has been fractured VNX Block Local Replication Principles5

Copyright © 2014 EMC Corporation. All Rights Reserved. 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 Principles6

Copyright © 2014 EMC Corporation. All Rights Reserved. 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 Principles7

Copyright © 2014 EMC Corporation. All Rights Reserved. SnapView Snapshot Limits VNX Block Local Replication Principles8 ParametersVNX5400 VNX5100 VNX5600 VNX5300 VNX5800 VNX5500 VNX7600 VNX5700 VNX8000 VNX7500 Max SnapView Snapshots per storage system Snapshots per source LUN Max SnapView Snapshot sessions per source LUN Reserved LUNs per storage system

Copyright © 2014 EMC Corporation. All Rights Reserved. SnapView Clone Limits VNX Block Local Replication Principles9 ParametersVNX5400VNX5600VNX5800VNX7600VNX8000 SnapView Clones per storage system SnapView Clones per source LUN Clone groups per storage system Clone private LUNs per storage system ParametersVNX5100VNX5300VNX5500VNX5700VNX7500 SnapView Clones per storage system SnapView Clones per source LUN Clone groups per storage system Clone private LUNs per storage system 22222

Copyright © 2014 EMC Corporation. All Rights Reserved. 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 Principles10

Copyright © 2014 EMC Corporation. All Rights Reserved. VNX Snapshot Terminology TermDefinition Primary LUNProduction LUN – the LUN from which replicas are made VNX SnapshotA point-in-time replica of a Primary LUN AttachMaps a snapshot to a Snapshot Mount Point (SMP) DetachRemoves the mapping between a snapshot and a Snapshot Mount Point RestoreRestore the Primary LUN to a point in time copy Unisphere SnapCLI utilityAn executable program that runs interactively or with a script to manage VNX Snapshots Snapshot Mount Point (SMP) Virtual LUN which can be attached to a VNX Snapshot to make it visible to a host Consistency GroupPersistent grouping of primary LUNs or Snapshot Mount Points Snapshot familyPool LUN, all of its associated mount points, and all of their snapshots Relocate on First Write (ROW) When data is changed on the Primary LUN for the first time, data is written to another area in the Pool VNX Block Local Replication Principles11

Copyright © 2014 EMC Corporation. All Rights Reserved. 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 Principles12

Copyright © 2014 EMC Corporation. All Rights Reserved. VNX Snapshot Limits VNX Block Local Replication Principles13 ParametersVNX5400VNX5600VNX5800VNX7600VNX8000 VNX Snapshots per storage system VNX Snapshots per primary LUN 256 VNX Snapshots per Consistency Group 64 Consistency Group per storage system VNX Snapshot Mount Points per storage system Concurrent Restore Operations per storage system

Copyright © 2014 EMC Corporation. All Rights Reserved. VNX Snapshot and SnapView Snapshot Comparison VNX Block Local Replication Principles14 VNX Snapshot TermSnapView Snapshots Term Definition SnapshotSessionPoint in time copy RestoreRollbackRestore primary LUN to point in time copy AttachActivateMake the point in time copy accessible to a host DetachDeactivateRemove the point in time copy from the host Consistency Groupn/aPersistent grouping of primary LUNs or Mount Points Snapshot Familyn/aPool LUN, all of its associated mount points and all of their snapshots Primary LUNSource LUNPool LUN that can be used by VNX Snapshots Snapshot Mount PointSnapshot [LUN]LUN that host uses to access the snapshot data

Copyright © 2014 EMC Corporation. All Rights Reserved. VNX Snapshot and SnapView Snapshot Features VNX Block Local Replication Principles15 FeatureVNX SnapshotsSnapView Snapshots Snapshot SpaceAutomatic in same poolReserved LUN Pool Max Snapshots per source2568 Max Snapshots per array32, Snapshots of SnapshotsYesNo Consistent SnapshotsYes Consistency GroupsYesNo Automatic Snapshot space management Auto-Delete snapshots & Snapshot expiration None Auto NamingOptionalNo Source LUN type Pool LUNs, Consistency Groups, and Snapshot Mount Points All LUNs Snapshot DescriptionYesNo Restore/RollbackYes In-Band Snapshot managementYes

Copyright © 2014 EMC Corporation. All Rights Reserved. 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 Principles16