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Lesson 11 – NETWORK DISASTER RECOVERY
Disaster recovery plans
Network backup and restoration
OVERVIEW
Definition:
A document that explores how a Network recovers from a
disaster that imperils its data or stops its functioning.
DISASTER RECOVERY PLAN
Assessing needs
Disaster scenarios
Communication
Offsite storage
Critical components for rebuilding
Disaster recovery plan
Plan for contingencies.
Define countermeasures.
Intimate external auditors about the plan.
Inform top management about Network risks.
Assessing needs
Calculate time needed to resolve problems.
Take input from top management to resume services.
Plan with key business considerations.
Assessing needs
Disaster scenarios
Disaster scenarios
Network failures:
Motherboard failure
Disk failure
Tape backup drive failure
Disaster scenarios
Possible responses:
Is a maintenance contract required?
Should hardware parts be stocked?
Disaster scenarios
Possible responses:
Can servers, routers, hubs, and switches be temporarily
replaced?
Can employees work with replacements/no system?
Board of Directors
CEO or President
Vice President(s)
Head of an affected area
Supervisor
Employees affected
Communication
Protects backup tapes.
Should be discussed in the disaster recovery plan.
Offsite storage
Computer equipment.
Software replacements.
Cost estimate of replaced equipment.
Critical components for rebuilding
Assessing needs.
Acquiring backup media/technologies.
Choosing backup strategies.
NETWORK BACKUP AND RESTORATION
Is dynamic data stored on the servers?
When and how does it change?
How much data needs to be backed up?
Assessing needs
At what rate is data growing?
How much time is available to make the backup?
How quickly must restoration take place?
Assessing needs
How coherent does backed up data need to be?
What is the trade-off between cost and recoverability?
How many levels of redundancy are needed?
Assessing needs
Acquiring backup media/technologies
Factors:
Reliability
Cost
Storage
Restoration frequency
Backup onto a single medium
Acquiring backup media/technologies
Acquiring backup media/technologies
Acquiring backup media/technologies
Full backup
Incremental backup
Differential backup
Choosing backup strategies
Choosing backup strategies
Rotation strategy:
Rebuild system with recent data.
Restore files from older tapes.
Protect against backup media failure.
Protect data from environment failure.
Choosing backup strategies
SUMMARY
Disaster recovery plans:
Assessing needs
Disaster scenarios
Communication
Offsite storage
Critical components for rebuilding
Summary
Network backup and restoration:
Assessing needs.
Acquiring backup media/technologies.
Choosing backup strategies.