Chapter 9 Review
Single point of failure
Any component that can cause the entire system to fail if it fails.
Disk subsystem that provides fault tolerance and increases availability.
Mirroring. Uses two disks.
Uses three or more disks and can survive the failure of one disk.
Uses four or more disks and can survive the failure of two disks.
Includes failover clusters and load balancing.
Remove a server as a single point of failure. If one node in a cluster fails, another node can take over.
Spreads the processing load over multiple servers to ensure availability when the processing load increases.
Used by many web-based applications for higher availability.
Uninterrupted power supply (UPS)
Provides fault tolerance for power fluctuations and provides short-term power for systems during power outages.
Provide long-term power for systems during extended power outages.
Full backup strategy
Alone allows the quirkiest recovery time.
Full/incremental backup strategy
Minimizes the amount of time needed to perform daily backups.
Verify the integrity of backups.
Should be labeled to identify the contents and copies should be kept off-site.
Business Impact Analysis (BIA)
Part of a business continuity plan (BCP) and it identifies systems and components that are essential to the organization's success.
Business Impact Analysis (BIA)
Identifies maximum down times for systems and components, various scenarios that can affect these systems and components, and the potential loss from an incident.
Recovery Time Objective (RTO)
Identifies the maximum amount of time it should take to restore a system after an outage.
Recovery Point Objective (RPO)
Refers to the amount of data you can afford to lose.
Continuity of Operations Planning (COOP) sites
Provides alternate locations for business functions after a major disaster.
Includes everything you need to be operational within 60 minutes.
The most effective recovery solution and the most expensive.
Has power and connectivity requirements and little else.
The least expensive to maintain.
A compromise between hot sites and cold sites.
Do not have dedicated locations, but can provide temporary support during a disaster.
Disaster Recovery Plan (DRP)
Part of an overall business continuity plan (BCP) and includes the steps to return one or more systems to full operation.
Ensures that an organization can continue to operate even if key leaders are unavailable.
Includes charts to identify roles and responsibilities to follow during a disaster, along with a clear chain of command.
Heating, ventilation, and air conditioning (HVAC) system
Controls airflow for data centers and server rooms.
HVAC temperature controls
Protect systems from damage due to overheating.
HVAC humidity controls
Protect against electrostatics discharge (ESD) damage by ensuring humid isn't too low.
HVAC humidity control
Protects against water damage from condensation by keeping humidity from getting too high.
Mean time between failures (MTBF)
You can increase the _________ times and overall availability by keeping server rooms at a lower operating temperature.
Prevents problems from EMI sources, such as fluorescent lighting fixtures, and also prevents data loss in twisted-pair cables.
13 Business Continiuity
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Chapter 1 Review
Chapter 2 Review
Chapter 3 Review
Chapter 4 Review