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Mirror View and SAN Copy Foundations - IMPACT

Dec 01, 2014

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muthu-raja

Copyright 2006 EMC Corporation. Do not Copy - All Rights Reserved.

Introduction to Business Continuity

2006 EMC Corporation. All rights reserved.

Welcome to Introduction to Business Continuity. This section introduces Business Continuity Solutions. It starts with a basic definition, then shows the business requirements for Business Continuity, followed by the history of Data Protection as a key component to Business Continuity. The AUDIO portion of this course is supplemental to the material and is not a replacement for the student notes accompanying this course. Copyright 2006 EMC Corporation. All rights reserved. These materials may not be copied without EMC's written consent. Use, copying, and distribution of any EMC software described in this publication requires an applicable software license. THE INFORMATION IN THIS PUBLICATION IS PROVIDED AS IS. EMC CORPORATION MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WITH RESPECT TO THE INFORMATION IN THIS PUBLICATION, AND SPECIFICALLY DISCLAIMS IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Celerra, CLARalert, CLARiiON, Connectrix, Dantz, Documentum, EMC, EMC2, HighRoad, Legato, Navisphere, PowerPath, ResourcePak, SnapView/IP, SRDF, Symmetrix, TimeFinder, VisualSAN, where information lives are registered trademarks. Access Logix, AutoAdvice, Automated Resource Manager, AutoSwap, AVALONidm, C-Clip, Celerra Replicator, Centera, CentraStar, CLARevent, CopyCross, CopyPoint, DatabaseXtender, Direct Matrix, Direct Matrix Architecture, EDM, E-Lab, EMC Automated Networked Storage, EMC ControlCenter, EMC Developers Program, EMC OnCourse, EMC Proven, EMC Snap, Enginuity, FarPoint, FLARE, GeoSpan, InfoMover, MirrorView, NetWin, OnAlert, OpenScale, Powerlink, PowerVolume, RepliCare, SafeLine, SAN Architect, SAN Copy, SAN Manager, SDMS, SnapSure, SnapView, StorageScope, SupportMate, SymmAPI, SymmEnabler, Symmetrix DMX, Universal Data Tone, VisualSRM are trademarks of EMC Corporation. All other trademarks used herein are the property of their respective owners.

MirrorView and SAN Copy Foundations - 1

Copyright 2006 EMC Corporation. Do not Copy - All Rights Reserved.

Course ObjectivesUpon completion of this course, you will be able to: Explain the concept of Business Continuity List the benefits of Business Continuity regarding expenses incurred as a result of downtime Explain how EMC uses Local and Remote mirroring in its storage methodologies to maintain data protection

2006 EMC Corporation. All rights reserved.

MirrorView and SAN Copy Foundations - 2

The objectives for this course are shown here. Please take a moment to read them.

MirrorView and SAN Copy Foundations - 2

Copyright 2006 EMC Corporation. Do not Copy - All Rights Reserved.

What is Business ContinuityBusiness Continuity is the preparation for, response to, and recovery from an application outage that adversely affects business operations Business Continuity Solutions addresses systems unavailability, degraded application performance, or unacceptable recovery strategies

2006 EMC Corporation. All rights reserved.

MirrorView and SAN Copy Foundations - 3

Business Continuity remains at the top of every executives priority list. Yet executives find themselves in a financial tug-of-war between business continuity solutions and other projects, competing for limited resources. Fundamental to business continuity is the need to understand an organizations practices relative to the protection, availability, and usability of data.

MirrorView and SAN Copy Foundations - 3

Copyright 2006 EMC Corporation. Do not Copy - All Rights Reserved.

Why Business ContinuityLost Productivity Number of employees impacted * hours out * hourly rateKnow the downtime costs per hour, day, two days...

Lost Revenue Direct loss Compensatory payments Lost future revenue Billing losses Investment losses

Damaged Reputation Customers Suppliers Financial markets Banks Business partners

Financial Performance Revenue recognition Cash flow Lost discounts (A/P) Payment guarantees Credit rating Stock price

Other Expenses Temporary employees, equipment rental, overtime costs, extra shipping costs, travel expenses... 2006 EMC Corporation. All rights reserved. MirrorView and SAN Copy Foundations - 4

There are many factors that need to be considered when calculating the cost of downtime. A formula to calculate the costs of the outage should capture both the cost of lost productivity of employees and the cost of lost income from missed sales. The Estimated average cost of 1 hour of downtime = (Employee costs per hour) *( Number of employees affected by outage) + (Average Income per hour). Employee costs per hour is simply the total salaries and benefits of all employees per week, divided by the average number of working hours per week. Average income per hour is just the total income of an institution per week, divided by average number of hours per week that an institution is open for business.

MirrorView and SAN Copy Foundations - 4

Copyright 2006 EMC Corporation. Do not Copy - All Rights Reserved.

Business Continuity Obstacles of AvailabilityDisaster (60km DWDM . . . . . . . . . . . . . . 200km Optical extender . . . . . . .40 km Longwave GBIC . . . . . . .10 km Shortwave GBIC . . . . . . .500 mDWDM MirrorView and SRDF over the same link DWDM

Direct attach CLARiiON to CLARiiON . .300/500 m Optical extender . . . . . . . . 10 km

Check CLARiiON Best Practices Guide for Latest Connectivity Information

Production Location 2006 EMC Corporation. All rights reserved. MirrorView and SAN Copy Foundations - 23

With MirrorView, you have the flexibility to architect and deploy business continuity solutions based on your business requirements, whether it is distance, performance, connectivity, and/or communication link costs. MirrorView can operate in a variety of configurations, from direct attach to using front-end switches, Dense Wave Division Multiplexors (DWDM), and even Fibre Channel over IP storage routers. The most common attaches, for synchronous MirrorView involve using Fibre Channel switches to extend the fabric. With front-end switch support, you are able to add additional host connectivity by connecting the CLARiiON systems directly to the switches and mirroring through the switches. By adding distance extenderseither Optical extenders, DWDM devices, or Fibre Channel over IP storage routersyou can configure an environment that supports your specific business requirements, whether it is local, campus, or extended distance. For configurations that require less host connectivity, you can deploy MirrorView in a direct attach configuration for distances up to 10 km when utilizing extender devices.

MirrorView and SAN Copy Foundations - 23

Copyright 2006 EMC Corporation. Do not Copy - All Rights Reserved.

MirrorView Foundations

CLARIION MIRRORVIEW TERMINOLOGY

2006 EMC Corporation. All rights reserved.

MirrorView and SAN Copy Foundations - 24

This section will review the terminology.

MirrorView and SAN Copy Foundations - 24

Copyright 2006 EMC Corporation. Do not Copy - All Rights Reserved.

Remote Mirror TermsPrimary CLARiiON that serves mirrored primary data to a production host

Secondary CLARiiON that contains a mirrored secondary copy of primary data

Mirror Synchronization Mechanism to copy data from primary LUN to a secondary LUN Mechanism may use fracture log/write intent log to avoid full data copy

Mirror Fracture Condition when a secondary is unreachable by the primary Can be invoked by administrative command 2006 EMC Corporation. All rights reserved. MirrorView and SAN Copy Foundations - 25

In normal operation, data is committed to the secondary image as part of the I/O processing before the system acknowledges the write back to the host. However, if a secondary LUN is unreachable, then MirrorView marks the secondary image as fractured and records the write on the primary LUN in a fracture log. MirrorView/A relies on SnapView to track changes made to the primary image, and will update the secondary at intervals chosen by the user.

MirrorView and SAN Copy Foundations - 25

Copyright 2006 EMC Corporation. Do not Copy - All Rights Reserved.

Remote Mirror State TermsMirror Availability States Inactive - admin control to stop mirror processingstate applies to the entire mirror

Active - I/O allowed (normal state) Attention - admin action required

Mirror Data States Out of sync - full sync needed In sync - primary LUN and secondary LUN contain identical data Consistent - write intent log, or fracture log, may be needed Synchronizing - mirror sync operation in progress Rolling back - a secondary MirrorView/A image is rolling back

Heartbeat Messages used to determine when a secondary is reachable Heartbeats only used after secondary determined unreachable 2006 EMC Corporation. All rights reserved. MirrorView and SAN Copy Foundations - 26

The three mirror states are inactive, active, and attention. These states vary in the ways that they respond to read and write requests from a host. Transitions between the states is either automatic or by administrative control. While a mirror is in any state, normal administrative operations can occur, such as adding or deleting a secondary array. The image states are: out-of-sync, in-sync, consistent, rolling back, and synchronizing. These states represent the relationships between the primary image and a secondary image. Rolling back is a state associated only with MirrorView/A - if an update of the secondary is incomplete, and it is desired to promote th

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