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© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity Module 3.1
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 2 Introduction to Business Continuity After completing this module, you will be able to: Define Business Continuity and Information Availability Detail impact of information unavailability Define BC measurement and terminologies Describe BC planning process Detail BC technology solutions
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 3 What is Business Continuity Business Continuity is preparing for, responding to, and recovering from an application outage that adversely affects business operations Business Continuity solutions address unavailability and degraded application performance BC is an integrated and enterprise wide process and set of activities to ensure “information availability”
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 4 What is Information Availability (IA) IA refers to the ability of an infrastructure to function according to business expectations during its specified time of operation IA can be defined in terms of three parameters: – Accessibility Information should be accessible at right place and to the right user – Reliability Information should be reliable and correct – Timeliness Information must be available whenever required
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 5 Causes of Information Unavailability Disaster (<1% of Occurrences) Natural or man made Flood, fire, earthquake Contaminated building Unplanned Outages (20%) Failure Database corruption Component failure Human error Planned Outages (80%) Competing workloads Backup, reporting Data warehouse extracts Application and data restore
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 6 Impact of Downtime Lost Revenue Know the downtime costs (per hour, day, two days...) Number of employees impacted (x hours out * hourly rate) 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... Direct loss Compensatory payments Lost future revenue Billing losses Investment losses Lost Productivity
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 7 Measuring Information Availability MTBF: Average time available for a system or component to perform its normal operations between failures MTTR: Average time required to repair a failed component IA = MTBF / (MTBF + MTTR) or IA = uptime / (uptime + downtime) Detection Incident Time Detection elapsed time Diagnosis Response Time Repair Recovery Repair time Restoration Recovery Time MTTR – Time to repair or ‘downtime’ Incident MTBF – Time between failures or ‘uptime’
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 8 Availability Measurement – Levels of ‘9s’ Availability % Uptime% DowntimeDowntime per YearDowntime per Week 98%2%7.3 days3hrs 22 min 99%1%3.65 days1 hr 41 min 99.8%0.2%17 hrs 31 min20 min 10 sec 99.9%0.1%8 hrs 45 min10 min 5 sec 99.99%0.01%52.5 min1 min 99.999%0.001%5.25 min6 sec 99.9999%0.0001%31.5 sec0.6 sec
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 9 BC Terminologies Disaster recovery – Coordinated process of restoring systems, data, and infrastructure required to support ongoing business operations in the event of a disaster – Restoring previous copy of data and applying logs to that copy to bring it to a known point of consistency – Generally implies use of backup technology Disaster restart – Process of restarting from disaster using mirrored consistent copies of data and applications – Generally implies use of replication technologies
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 10 BC Terminologies (Cont.) Recovery Point Objective (RPO) Point in time to which systems and data must be recovered after an outage Amount of data loss that a business can endure Recovery Time Objective (RTO) Time within which systems, applications, or functions must be recovered after an outage Amount of downtime that a business can endure and survive Recovery-point objectiveRecovery-time objective
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 11 Business Continuity Planning (BCP) Process Identifying the critical business functions Collecting data on various business processes within those functions Business Impact Analysis (BIA) – Risk Analysis Assessing, prioritizing, mitigating, and managing risk Designing and developing contingency plans and disaster recovery plan (DR Plan) Testing, training and maintenance
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 12 BC Technology Solutions Following are the solutions and supporting technologies that enable business continuity and uninterrupted data availability: – Single point of failure – Multi-pathing software – Backup and replication Backup recovery Local replication Remote replication
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 13 Resolving Single Points of Failure FC Switches Storage Array Redundant Network Clustered Servers Redundant Arrays Remote Site Redundant Ports Redundant FC Switches Redundant Paths Heartbeat Connection IP Storage Array Client
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 14 Multi-pathing Software Configuration of multiple paths increases data availability Even with multiple paths, if a path fails I/O will not reroute unless system recognizes that it has an alternate path Multi-pathing software helps to recognize and utilizes alternate I/O path to data Multi-pathing software also provide the load balancing Load balancing improves I/O performance and data path utilization
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 15 Backup and Replication Local Replication – Data from the production devices is copied to replica devices within the same array – The replicas can then be used for restore operations in the event of data corruption or other events Remote Replication – Data from the production devices is copied to replica devices on a remote array – In the event of a failure, applications can continue to run from the target device Backup/Restore – Backup to tape has been a predominant method to ensure business continuity – Frequency of backup is depend on RPO/RTO requirements
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 16 Module Summary Key points covered in this module: Importance of Business Continuity Types of outages and their impact to businesses Information availability measurements Definitions of disaster recovery and restart, RPO and RTO Business Continuity technology solutions overview
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 17 Concept in Practice – EMC PowerPath SERVER STORAGE SCSIDriverSCSIDriverSCSIDriverSCSIDriverSCSIDriverSCSIDriver SCSI Controller PowerPath Host Based Software Resides between application and SCSI device driver Provides Intelligent I/O path management Transparent to the application Automatic detection and recovery from host-to-array path failures Host Application (s) LUN Storage Network
© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity - 18 Check Your Knowledge Which concerns do business continuity solutions address? “Availability is expressed in terms of 9s.” Explain the relevance of the use of 9s for availability, using examples. What is the difference between RPO and RTO? What is the difference between Disaster Recovery and Disaster Restart? Provide examples of planned and unplanned downtime in the context of data center operations. What are some of the Single Points of Failure in a typical data center environment?
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