© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity Module 3.1.

© 2009 EMC Corporation. All rights reserved.

Introduction to Business ContinuityIntroduction 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


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”


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


Causes of Information Unavailability

Disaster (<1% of Occurrences)

Natural or man made Flood, fire, earthquakeContaminated building

Unplanned Outages (20%)

FailureDatabase corruptionComponent failureHuman error

Planned Outages (80%)

Competing workloads Backup, reportingData warehouse extractsApplication and data restore


Impact of Downtime

Lost RevenueKnow 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 ExpensesTemporary employees, equipment rental, overtime costs, extra shipping costs, travel expenses...

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

Lost Productivity


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

IncidentTime

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’


Availability Measurement – Levels of ‘9s’ Availability

% Uptime % Downtime Downtime per Year Downtime per Week

98% 2% 7.3 days 3hrs 22 min

99% 1% 3.65 days 1 hr 41 min

99.8% 0.2% 17 hrs 31 min 20 min 10 sec

99.9% 0.1% 8 hrs 45 min 10 min 5 sec

99.99% 0.01% 52.5 min 1 min

99.999% 0.001% 5.25 min 6 sec

99.9999% 0.0001% 31.5 sec 0.6 sec


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


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 objective Recovery-time objective

Seconds

Minutes

Hours

Days

Weeks

Seconds

Minutes

Hours

Days

Weeks Tape Backup

Periodic Replication

Asynchronous Replication

Synchronous Replication

Tape Restore

Disk Restore

Manual Migration

Global Cluster


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


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


Resolving Single Points of Failure

FC Switches

Storage Array

Redundant Network

Clustered ServersRedundant Arrays

Remote Site

Redundant Ports

Redundant FC Switches

Redundant Paths

Heartbeat Connection

IP

Storage Array

Client


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


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


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


Concept in Practice – EMC PowerPath

SE

RV

ER

ST

OR

AG

E

SCSISCSIDriverDriver






SCSISCSIControllerController






PowerPathPowerPath 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)Host Application (s)

LUNLUN

LUNLUN

Storage Network


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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© 2009 EMC Corporation. All rights reserved. Introduction to Business Continuity Module 3.1.

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