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SnapView Clones. Upon completion of this module, you should be able to: Describe SnapView Clone operations Manage SnapView Clones. SnapView Clones. Lesson 1: SnapView Clone: Theory and Operation. During this lesson the following topics are covered: Purpose of SnapView Clones

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snapview clones

SnapView Clones

Upon completion of this module, you should be able to:

Describe SnapView Clone operations

Manage SnapView Clones

VNX Snapview Clones

snapview clones1

SnapView Clones

Lesson 1: SnapView Clone: Theory and Operation

During this lesson the following topics are covered:

Purpose of SnapView Clones

SnapView Clones requirements

SnapView Clones managed objects

SnapView Clones theory of operations

VNX Snapview Clones

snapview clones2
SnapView Clones
  • SnapView Clone – a full copy of a LUN internal to a storage system
  • Population latency
    • Clones take time to populate (synchronize)
    • Data in the LUN must be duplicated
  • Protected
    • No changes will be made to the clone UNLESS the user writes to it
  • 2-way synchronization
    • Clones may be incrementally updated from the source LUN
    • Source LUNs may be incrementally updated from a clone
  • Copies real data
    • Clone must be EXACTLY the same size as Source LUN

VNX Snapview Clones

snapview clones operations
SnapView Clones Operations
  • Create Clone Group
    • Changes LUN to source LUN
  • Add clone to Clone Group
    • Changes LUN to clone
  • Synchronize Clone
    • Data copied from source LUN to clone
  • Fracture clone (may be a consistent operation)
    • Stops updating of clone with new source LUN data
  • Remove clone
    • Clone becomes an independent LUN
    • Cannot be synchronizing or reverse synchronizing
  • Destroy Clone Group
    • Source LUN becomes an independent LUN

VNX Snapview Clones

clone initial synchronization
Clone Initial Synchronization
  • Copy contents of source LUN to clone
    • Overwrites clone with source LUN data
    • Host access allowed to source LUN at all times
    • No host access to clone while not fractured

Production Host

Source LUN

Backup Host

. . .

X

Clone 1

Clone 2

Clone 8

VNX Snapview Clones

clone private lun cpl and fracture log
Clone Private LUN (CPL) and Fracture Log
  • Fracture Log
    • Bitmap stored in SP memory
    • Tracks modified extents between source LUN and each clone
    • Allows incremental resynchronization – in either direction
    • Determines extent size
      • 1 block for each GB of source LUN size, with a minimum of 128 KB
      • Example: 512 GB clone. Extent size = 512 blocks = 256 KB
  • Private LUN for each SP
    • Must be 1 GB or greater
    • Used for all clones owned by the SP
    • No clone operations allowed until CPL created
    • Contains persistent Fracture Logs
    • Classic LUNS only

VNX Snapview Clones

clone reverse synchronization
Clone Reverse Synchronization
  • Restore source LUN with contents of clone
    • Overwrites source LUN with clone data
    • Host access allowed to source LUN
    • No host access to clone
    • Source LUN instantly appears to contain clone data

Production Host

Source LUN

X

Backup Host

X

X

. . .

Clone 1

Clone 2

Clone 8

X

VNX Snapview Clones

reverse synchronization and protected restore
Reverse Synchronization and Protected Restore
  • Non-Protected Restore
    • Host → source LUN writes mirrored to clone
    • When Reverse Synchronization completes:
      • Reverse-synchronized clone remains unfractured
        • Other clones remain fractured
  • Protected Restore
    • Host → source LUN writes not mirrored to clone
    • When Reverse Synchronization completes:
      • All clones are fractured
        • Protects against source LUN corruption
    • Configure at the individual clone level
      • Must be globally enabled first with ‘Allow Protected Restore” checkbox

VNX Snapview Clones

trespassing source luns and clones
Trespassing Source LUNs and Clones
  • Source LUN Trespass
    • Peer SP acquires clones
    • Peer SP acquires Fracture Logs (through CPL)
    • Peer SP resumes any synchronization operations
  • Clone Trespass
    • User or host can initiate trespass of a fractured clone
      • Desirable for load balancing across SPs
    • Fractured clone need not be on same SP as source LUN
    • Synchronization trespasses clone as necessary

VNX Snapview Clones

snapview clones3

SnapView Clones

Lesson 1: Summary

During this lesson the following topics were covered:

Purpose of SnapView Clones

SnapView Clones requirements

SnapView Clones managed objects

SnapView Clones theory of operations

VNX Snapview Clones

snapview clones4

SnapView Clones

Lesson 2: Clone Configuration

During this lesson the following topics are covered:

Clone configuration

Creating and populating Clone Groups

VNX Snapview Clones

creating a clone group
Creating a Clone Group

VNX Snapview Clones

clone group properties
Clone Group Properties

VNX Snapview Clones

clone operations
Clone Operations

VNX Snapview Clones

clone time of fracture
Clone Time of Fracture
  • Allows the user to know the date/time when the Clones images were administratively fractured
  • Clones will stamp the time ONLY when the clones were administrative fractured by the user and the images were a point in time copy (consistent state)
  • The time will be stored persistently inside the current clones private area in PSM
  • All Clones involved in a Consistent Fracture operation reports the same time of fracture
  • Private LUN for each SP

VNX Snapview Clones

clone configuration wizard
Clone Configuration Wizard

VNX Snapview Clones

snapview clones5

SnapView Clones

Lesson 2: Summary

During this lesson the following topics were covered:

Clone Private LUN configuration

Clone operations

VNX Snapview Clones

summary
Summary

Key points covered in this module:

  • SnapView Clone is a full copy of a LUN internal to a VNX storage system
  • Clones take time to duplicate data from source
  • Clones must be exactly the same size

VNX Snapview Clones