Questions 1. Compare and contrast “high availability” and “disaster recovery” fo
ID: 669362 • Letter: Q
Question
Questions
1. Compare and contrast “high availability” and “disaster recovery” for IT systems.
2. A computer system consists of the following components with stated MTBF:
Component
MTBF
Hard drive
600,000 hours
Network interface card
300,000 hours
Motherboard
300,000 hours
Power supply
100,000 hours
Monitor
75,000 hours
a. What is the overall MTBF for this system?
b. If our company owned 100 of these systems, how many would we expect to repair every year?
c. Is it valid to say that a single system with an MTBF of 40,000 hours should last roughly 4.5 years between repairs? Why or why not?
3. How are recovery time objective (RTO) and recovery point objective (RPO) related in disaster recovery?
4. Describe the Zachmann framework for enterprise architecture. What do the rows represent? What do the columns represent?
5. How is the system model stack related to the concept of security “defense in depth?”
Component
MTBF
Hard drive
600,000 hours
Network interface card
300,000 hours
Motherboard
300,000 hours
Power supply
100,000 hours
Monitor
75,000 hours
Explanation / Answer
1)
High availability (HA) is the measurement of a system’s ability to remain accessible in the event of a system component failure. Generally, HA is implemented by building in multiple levels of fault tolerance and/or load balancing capabilities into a system. On the other hand, disaster recovery (DR) is the process by which a system is restored to a previous acceptable state, after a natural or man-made disaster. While they both increase overall availability, a notable difference is that with HA there is, generally, no loss of service. HA refers to the retaining of the service and DR to the retaining of the data. Whereas, with DR there is usually a slight loss of service while the DR plan is executed and the system is restored.
2)
it will be the average of all five
13,75,000/5 = 2,75,000
if we have 100 such systems then it will be 2750 hours every year of a fault.
In a year we have 8760 hours
so total number of machines which needs to be repaired will be 8760/2750 = 3
c)
Yes it is ok to say this as every year will have 8760 hours and depending on that 40,000/8760 will give the approx 4.5 years
3)
They are both the terms used in disaster recovery. They both deployed for various techniques to handle disaster related activities.
Zachmann framework is used for enterprise architecture to provide a formal and structured way of viewing and defining an enterprise.
Rows represent the methos and activities for enterprise and columns represent how and what to do to solve those problems.
5)
System model stack defines the security in depth. It has layers to define levels of security in the application.
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