R_MOD_13-VNX_Snapshot

Transcript R_MOD_13-VNX_Snapshot

VNX Snapshot

VNX Snapshot 1

VNX Snapshot

Lesson 1: VNX Snapshots: Theory and Operation During this lesson the following topics are covered: • Purpose of VNX Snapshots • • VNX Snapshots requirements VNX Snapshots managed objects • VNX Snapshots theory of operations Copyright © 2014 EMC Corporation. All Rights Reserved.

VNX Snapshot 2

VNX Snapshots

• VNX Snapshots – virtual point-in-time copy of a LUN  Allows to create snapshots of pool-based LUNs  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  SnapCLI VNX Snapshot 3 Copyright © 2014 EMC Corporation. All Rights Reserved.

VNX Snapshots Requirements

Hardware

Environment

Storage System Software Management Software Operating Systems

System Requirements

VNX Storage System Two or more Servers (if the VNX Snapshots snap is to be accessed by a host), each attached to the VNX that will run VNX Snapshots VNX Operating Environment for Block Release 32 VNX Snapshot enabler Unisphere UI Navisphere Secure CLI SnapCLI HP-UX IBM AIX Linux Solaris Windows Server Refer to EMC Support Matrix for a complete list VNX Snapshot 4 Copyright © 2014 EMC Corporation. All Rights Reserved.

VNX Snapshots Managed Objects

• Primary LUN  Pool LUN from which the snapshot is taken • Snapshot  Point-in-time copy of a LUN • Snapshot Mount Point  An object that is exposed to the host through a storage group • Consistency Group  Persistent grouping of primary LUNs or Mount Points Copyright © 2014 EMC Corporation. All Rights Reserved.

VNX Snapshot 5

VNX Snapshots Characteristics

Primary LUN 2:00 pm Snapshot 4:00 pm Snapshot 6:00 pm Snapshot Dev Snapshot Patch 1 Snapshot Patch 2 Snapshot • Scalability  256 snapshots per LUN  Thin provisioned copies  Lower write performance impact • Functionality  Snapshot of a Snapshot  RecoverPoint support  Clone support • Consistency Groups VNX Snapshot 6 Copyright © 2014 EMC Corporation. All Rights Reserved.

VNX Snapshot Mount Points

• A Snapshot Mount Point is a container that holds SCSI attributes  Behaves like a LUN of the same size as the Primary LUN  Added as a member LUN in the secondary host Storage Group • A VNX Snapshot is attached to a Snapshot Mount Point (SMP) in order to allow host access to the replica data • VNX Snapshots are easily switched on one SMP  No SCSI rescan is required on the host • Must have an attached Snapshot for data to be host-visible Copyright © 2014 EMC Corporation. All Rights Reserved.

VNX Snapshot 7

VNX Snapshot Consistency Group

• • • A group of Primary LUNs or VNX Snapshot Mount Points Snapshots can be made of the entire Group Primary LUNs or VNX SMPs can be added to the Group  Snapshots may have more or fewer members as a result  Snapshots being restored must have the same members as the Group • • Does not require application I/O to be stopped Related terms  VNX Snapshot Set a Snapshot of a Consistency Group  VNX Snapshot Family – a group of Snapshots of the same LUN VNX Snapshot 8 Copyright © 2014 EMC Corporation. All Rights Reserved.

SnapView and VNX Snapshot Terminology Comparison

VNX Snapshot Term SnapView Term Definition

Snapshot Session Point in time copy Restore Attach Detach Consistency Group Snapshot Family Primary LUN Snapshot Mount Point Rollback Activate Deactivate n/a n/a Source LUN Snapshot [LUN] Restore primary LUN to point in time copy Make the point in time copy accessible to a host Remove the point in time copy from the host Persistent grouping of primary LUNs or Mount Points Pool LUN, all of its associated mount points and all of their snapshots Pool LUN that can be used by VNX Snapshots LUN that host uses to access the snapshot data VNX Snapshot 9 Copyright © 2014 EMC Corporation. All Rights Reserved.

Snapshot Technology Comparison: Source LUN Writes

Copy on first write

Redirect on write

VNX Snapshot 10

Snapshot Technology Comparison: Snapshot Reads

Read from two places

Read from a single place

VNX Snapshot 11

VNX Snapshot Operations

• • • • • • • • Create a Snapshot Create a Snapshot Mount Point (SMP) Attach a Snapshot Copy a Snapshot Snap a Snapshot Mount Point (Cascading Snapshots) Detach a Snapshot Mount Point Destroy a Snapshot Attach a Consistency Snapshot Copyright © 2014 EMC Corporation. All Rights Reserved.

VNX Snapshot 12

Create a VNX Snapshot

Primary LUN Lun_20 Snap 1 (R/O)

Creation time:

8pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 2 (R/O)

Creation time:

9pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 1 Snap 2

VNX Snapshot 13

Create a VNX Snapshot Mount Point (SMP)

Primary LUN Lun_20 Snap 1 (R/O)

Creation time:

8pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 2 (R/O)

Creation time:

9pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 1 Snap 2 SMP1

VNX Snapshot 14

Attach a VNX Snapshot to a SMP

Primary LUN Lun_20 Snap 1 (R/O)

Creation time:

8pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 2 (R/W)

Creation time:

9pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

SMP1 Snap 1 Snap 2 SMP1

VNX Snapshot 15

Copy a VNX Snapshot (Snap of a Snap)

Primary LUN Lun_20 Snap 1 Snap 2 Snap 3

. . .

Snap 1 (R/W)

Creation time:

8pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 2 (R/W)

Creation time:

9pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

SMP1 Snap 2 (R/O)

Creation time:

8pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

VNX Snapshot 16

Snap of a Snapshot Mount Point

. . .

Lun_20 Primary LUN Snap 1 Snap 1 (R/O)

Creation time:

8pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 2 Snap 2 (R/W)

Creation time:

9pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

SMP1 SMP1 Snap 2.1

Snap 1 (R/O)

Creation time:

10pm

Last modify time: Last modified by: Source LUN:

SMP1

Primary LUN:

LUN_20

Attached LUN:

Snap 2.2

Snap 2 (R/O)

Creation time:

11pm

Last modify time: Last modified by: Source LUN:

SMP1

Primary LUN:

LUN_20

Attached LUN:

SMP1

Detach a VNX Snapshot to a SMP

Primary LUN Snap 1 (R/O)

Creation time:

8pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 2 (R/W)

Creation time:

9pm

Last modify time:

11:47pm

Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

SMP1 Lun_20 Snap 1 Snap 2 X SMP1

VNX Snapshot 18

Destroy a VNX Snapshot

Primary LUN Lun_20 Snap 1 (R/O)

Creation time:

8pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 2 (R/O)

Creation time:

9pm

Last modify time: Last modified by: Source LUN:

LUN_20

Primary LUN:

LUN_20

Attached LUN:

Snap 1 SMP1

VNX Snapshot 19

Attach a Consistency Snapshot

Host 1 Lun_20 Lun_21 SMP LUN_20 SMP LUN_21 R/W CG Snap 1 CG1

Host 2

VNX Snapshot 20

VNX Snapshot

Lesson 1: Summary During this lesson the following topics were covered: • Purpose of VNX Snapshots • • VNX Snapshots requirements VNX Snapshots managed objects • VNX Snapshots theory of operations Copyright © 2014 EMC Corporation. All Rights Reserved.

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VNX Snapshot

Lesson 2: Managing VNX Snapshots During this lesson the following topics are covered: • Displaying VNX Snapshots • • VNX Snapshot expiration Cascading VNX Snapshots • Restoring VNX Snapshots Copyright © 2014 EMC Corporation. All Rights Reserved.

VNX Snapshot 22

VNX Snapshot Management

VNX Snapshots 23

VNX Snapshot Properties

SnapView Snapshots 24

VNX Snapshot Consistency Group Properties

SnapView Snapshots 25

Storage Pool Properties - VNX Snapshots

SnapView Snapshots 26

VNX Snapshot and SMP Creation

SnapView Snapshots 27

VNX Snapshot Expiration

• Every VNX Snapshot may have an optional expiration date • Expired VNX Snapshots are destroyed at regular intervals •  VNX array scans for expired snapshots once an hour • Set an expiration date only after Auto-Delete is disabled User is warned before Snapshots are deleted Copyright © 2014 EMC Corporation. All Rights Reserved.

SnapView Snapshots 28

Cascading VNX Snapshots

• VNX Snapshot of an attached Snapshot Mount Point

Not attached

Attached

SnapView Snapshots 29

Restore

• • Use VNX Snapshot to restore a primary LUN or a SMP Data in the LUN is changed to match the data in the snapshot  Does not change the “Restore Point” snapshot  Return no the poin-in-time of the source data • • Used when recovering from data corruption LUN with state ‘Initializing’ while being restored  Changes back to ‘Ready’ after the restore is complete • Restoring can change the LUN size  If the source snapshot was taken before the primary LUN expansion or shrinking SnapView Snapshots 30 Copyright © 2014 EMC Corporation. All Rights Reserved.

Restore Considerations

• Restore with SnapView Snapshots and VNX Snapshots  Restore a primary LUN from a VNX Snapshot  All SnapView session must be manually stopped  Restore a primary LUN from a SnapView Snapshot  VNX Snapshots are unaffected • • Stop application access to the primary LUN Flush the buffers for the drive Copyright © 2014 EMC Corporation. All Rights Reserved.

SnapView Snapshots 31

Restoring a Primary LUN

SnapView Snapshots 32

VNX Snapshot Configuration Wizard

SnapView Snapshots 33

VNX Snapshot

Lesson 2: Summary During this lesson the following topics were covered: • VNX Snapshot Management • • VNX Snapshot properties VNX Snapshot expiration and restore Copyright © 2014 EMC Corporation. All Rights Reserved.

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VNX Snapshot Summary

• • Key points covered in this module: VNX Snapshot provides a point-in-time virtual copy of pool based LUNs using ROW technology A Snapshot Mount Point is a container that holds SCSI attributes, behaves like a LUN, and is added to host Storage Group Copyright © 2014 EMC Corporation. All Rights Reserved.

VNX Snapshot 35