1 © Copyright 2008 EMC Corporation. All rights reserved. Planning for Remote Replication Larry Anderson EMC Technical Consultant for Business Continuity

1© Copyright 2008 EMC Corporation. All rights reserved.

Planning for Remote Replication

Larry AndersonEMC Technical Consultant for Business Continuity


Agenda

Barriers to DR

Planning Process

Bandwidth sizing data– DR Planning

Replication Modes

WAN Optimization

Application Consistency


The Core Problem

As long as the motor isn’t started, everything is fine


What Are The Barriers to Disaster Recovery?

Cost of the network– Dedicated, high quality bandwidth

Cost of equipment– Need extra disk capacity &/or cache

Application complexity – Which applications need to be replicated?– Which applications are grouped together?

Coordination of total solution– Servers, people, data, applications– Disaster recovery processes


Business Continuity Planning

Definition

Project InitiationProject Initiation

Risk AssessmentRisk Assessment

Business ImpactAnalysis

Business ImpactAnalysis

Plan RecoveryStrategies

Plan RecoveryStrategies

Strategy

Gap AnalysisGap Analysis

SolutionAlternatives

SolutionAlternatives

Facilitated WorkshopFacilitated Workshop

Document Recommendations

Document Recommendations

Meta Data Capture

Meta Data Capture

NetworkArchitecture

NetworkArchitecture

DataArchitecture

DataArchitecture

Design

Describe Client/ServerArchitecture

Describe Client/ServerArchitecture

Develop Policies& Procedures

Develop Policies& Procedures

Solution

TestingTesting

Pre-ActivationMeasurementPre-ActivationMeasurement

ActivationActivation

Post-ActivationMeasurement

Post-ActivationMeasurement

Manage

Review BusinessDrivers

Review BusinessDrivers

Review ITProceduresReview IT

Procedures

Gap AnalysisGap Analysis

DR/BC Trial ParticipationDR/BC Trial Participation

DocumentImprovements

DocumentImprovements


RPO

Decision Drivers and Tradeoffs

Primary Decision Drivers

Business Considerations

Technical Considerations

Cost

Amortization

RTO

Performance

Availability

Capacity

Recovery


PrimaryA

Secondary

-or-

Tertiary

Dual Primary

or-Secondary

Synch

Asynch

Asynch

AsynchNetwork

Availability Strategies:Disaster Recovery (DR)High Availability (HA)Continuous Availability (CA)

In-Region

Out-Region

Commercial Hotsites

-Acxiom-Sungard


Typical Bandwidth Comparisons

Bandwidth requirements– Synch (Metropolitan) requires highest bandwidth,– Asynch mitigates network bandwidth by increasing RPO to minutes– Asynch Tier 2 mitigates network bandwidth by increasing RPO to hours

Supporting analyses– Asynch Tier 0 & 1 analyzes peak writes/second over time period– Asynch Tier 2 analyzes maximum track changes over time period

WAN optimization products can have a big impact on the required bandwidth requirements.

Time

B/W

Asynch (Out of Region) B/W Needs RPO: Minutes

Asynch Tier 2 (Out of Region) B/W Needs RPO: Hours

Synch (Metro) B/W Needs RPO: Zero

Co

sts


Data Collections for Bandwidth Modeling

For EMC Environments– Symmetrix: Control Center Performance Monitor Data– Symmetrix: Service Processor based data collections (STP)– CX3: Navisphere CLI archivedump NAR data

Non EMC Environments– Host Data Collections

Windows Perfmon HP/UX sar AIX iostat Linux iostat Solaris iostat iSeries WRKDSKSTS Mainframe SMF and CMF

Workload Generator (Simulated Data)


Sample Write Activity Workload

Writes Per Second

Look for and understand workload

peaks


Write Profile


Sample Multiple Storage Subsystem Model


Sample Uncompressed Mbytes per Second Throughput Requirements


IO Profile Charts

Looking for repetitive cycles


Sample Model Exceeding OC12 Bandwidth


Silver Peak FunctionalityA technology for improving network usage for all IP replication

• Network Memory works across all applications• Offloads CPU intensive processes from end stations• Byte level fingerprinting is more granular than block techniques• Bi-directional: Handles recovery as well as backup/replication• SECURITY, SECURITY, SECURITY

• Entire process handled with full encryption • Incorporates other WAN optimization techniques:

• Loss Mitigation, QoS/Traffic Management, Latency Mitigation

WAN Acceleration with Silver Peak

• Improve RTO/RPO• Avoid bandwidth costs• Real-time WAN performance• Centralize servers and storage

Business Benefits

Additional Info:EMC Select URL for Silver Peak: http://powerlink.emc.com/km/appmanager/km/secureDesktop?_nfpb=true&_pageLabel=query1&internalId=0b014066802f83b7&_irrt=true

• Transparently intercept traffic in real-time• Fingerprint at byte level; store on local disk • Deliver duplicate data from local instance• Data always encrypted

How Network Memory works:

Data center challenges

• Cannot meet RPO/RTO • Diverse application mix• Bandwidth (cost/availability)• Branch fan-in

http://powerlink.emc.com/km/appmanager/km/secureDesktop?_nfpb=true&_pageLabel=query1&internalId=0b014066802f83b7&_irrt=true






F5 FunctionalityA technology for improving network usage for all IP replication

• Simple to use• Transparent – Non-invasive• SRDF Replication is unaware that TDR is being applied• Protocol agnostic• Applicable to any TCP protocol (e.g. SRDF,FTP, CIFS,etc)• File type agnostic

• Works for any file type (e.g. Powerpoint, PDF, CAD) including proprietary file types

• Data reduction even for compressed data• ZIP Archive, images etc.

• Dramatically higher bandwidth savings than traditional compression techniques

• No files are stored or cached on disk

WAN Acceleration with F5

• Reduced WAN costs / utilization• Improvement in RPO/RTO of SRDF• Reduced business risk of unmet

RPO/RTO’s

Business Benefits

Additional Info:EMC Select URL for F5: http://powerlink.emc.com/km/appmanager/km/secureDesktop?_nfpb=true&_pageLabel=query1&internalId=0b014066802b47a2&_irrt=true

• Decreased usage of bandwidth• Accelerated Replication processes• Prioritization of traffic• Big improvement over Symm compression• Decreased susceptibility to packet loss• Encryption of SRDF payloads with SSL

Technical Benefits

Data center challenges• Cannot meet RPO/RTO • Diverse application mix• Bandwidth (cost/availability) LAN A LAN B

SYN

ACK

SYN

ACKWANJet WANJet

http://powerlink.emc.com/km/appmanager/km/secureDesktop?_nfpb=true&_pageLabel=query1&internalId=0b014066802b47a2&_irrt=true

http://powerlink.emc.com/km/appmanager/km/secureDesktop?_nfpb=true&_pageLabel=query1&internalId=0b014066802b47a2&_irrt=true


What happens if someone turns off all What happens if someone turns off all the servers……… now?the servers……… now?


Application Consistency: The Problem

Systems share related information…

How do you get a consistent view of it all?

Without consistent database copies,

transactions must be recreated manually

Orders Shipments

CRM

Orders Shipments

Order/Ship

How do you discover the interrelationships?


Application Consistency: The Enterprise Solution

EMC Business Continuity products create point-in-time,

restartable copies for all affected databases,

ensuring enterprise-wide consistency across multiple databases,

applications, & platforms

UNIX

Mainframe

Windows


Local High Availability, Remote Disaster Recovery

Users

Load Balancers Cisco, F5 Big-IP, Foundry

Middleware (TP Monitor) Tuxedo, MQ Series, Citrix

Application Server Farm10g Services, Transparent Application Failover (TAF)

Database Oracle 10g, RAC

Storage Sync replication RecoverPoint, SRDF/A

Notes

Standby and used for testing. May be replicated, but must consider state vis a vis database.

Database M2Database M1

Site B DR

RPO 1 min

RTO 4hr

Active Active

Standby and used for testing.

SAN

BCV

Database R2

SAN

Site A Site B

Test & Dev, Backup,Reporting

NSPOF New zoneset for DNS, AD domain.

High Availability Disaster Recovery

Local & Remote Sites:

Assumes Production

Documents

1 © Copyright 2008 EMC Corporation. All rights reserved. Planning for Remote Replication Larry Anderson EMC Technical Consultant for Business Continuity