Cloud Computing Failover System Quiz and Flashcards

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Questions and Answers

In a failover system mechanism, what is the purpose of using established clustering technology?

To reduce the cost of IT resources
To improve the speed of IT resources
To increase the reliability and availability of IT resources (correct)
To enhance the security of IT resources

What does a failover system do when the currently active IT resource fails?

It switches over to other redundant instances to continue offering the service (correct)
It decreases the workload on other redundant instances
It increases the communication between redundant instances
It shuts down all other redundant instances

What is the purpose of a load balancer in an active-active configuration?

To only include the failed instance in its scheduler
To stop the communication between primary and redundant instances
To decrease the redundancy of IT resources
To distribute the workload among active systems and exclude failed instances (correct)

How does a failover system in a cloud environment help achieve high availability?

By actively monitoring for errors and unavailability conditions (B) Signup and view all the answers

What are the two types of configurations mentioned in the text for a failover system?

Active-active and active-passive configurations (D) Signup and view all the answers

Why is it beneficial for a failover system to span multiple geographical regions?

To host redundant implementations of the same IT resource at different locations (C) Signup and view all the answers

What happens in the event of a primary storage device failure in cloud computing?

Cloud consumer requests are diverted to the secondary device (A) Signup and view all the answers

Which Microsoft Azure storage model offers three synchronous copies in a single data center?

Locally redundant storage (LRS) (A) Signup and view all the answers

What is the consequence of a hypervisor failure in a virtual server environment?

All hosted virtual servers fail (A) Signup and view all the answers

What is the purpose of a high-availability cluster in hypervisor clustering architecture?

To ensure continuous operation in case of failures (D) Signup and view all the answers

How does Microsoft Azure's Zone Redundant Storage (ZRS) differ from Geo-redundant storage (GRS)?

ZRS replicates data across facilities within a region, GRS across regions (C) Signup and view all the answers

What is the consequence of load balancing across multiple clouds if one cloud experiences a failure?

Traffic is rerouted to the remaining operational clouds (A) Signup and view all the answers

What is the purpose of creating multiple instances of the same IT resource?

To improve the performance of the virtual server (B) Signup and view all the answers

When a virtual server becomes unavailable in Data Centre A, what is the role of the VIM in Data Centre B?

Detecting the failure condition and reallocating the server to Data Centre B (C) Signup and view all the answers

In a high-availability architecture, how are stored VM images handled between data centres?

They are replicated between data centres (B) Signup and view all the answers

What is the function of a load balancer in cloud architecture?

To automatically distribute incoming traffic across multiple instances (C) Signup and view all the answers

How does a load balancer contribute to preventing overload in cloud environments?

By distributing incoming traffic according to predefined rules (B) Signup and view all the answers

What role does hypervisor clustering architecture play in ensuring virtual server availability?

Replicating multiple instances of a virtual server to improve availability (C) Signup and view all the answers

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Study Notes

Failover System Mechanism

Increases reliability and availability of IT resources using clustering technology
Provides redundant implementations of IT resources
Actively monitors for errors and unavailability conditions
Automatically switches to redundant or standby instance in case of failure

Configurations

Active-active: Both primary and redundant instances serve workload simultaneously
Active-passive: One instance serves while the other is standby

Replication

Creates multiple instances of IT resources to deal with availability and performance issues
Hypervisor can replicate instances of virtual servers using stored virtual server images
Enables high-availability virtual servers to run in multiple data centers

High-Availability Virtual Server

Runs in multiple data centers with replicated stored VM images
VIM instances detect failure conditions and reallocate high-availability server to another data center

Load Balancer

Automatically distributes incoming traffic across multiple instances
Prevents overloading of instances
Rules-based distribution

Storage Resiliency

Microsoft Azure offers four models: Locally redundant storage (LRS), Geo-redundant storage (GRS), Read-access geo-redundant storage (RA-GRS), and Zone redundant storage (ZRS)

Hypervisor Clustering Architecture

Establishes high-availability cluster of hypervisors across multiple physical servers
Controlled via a central VIM
Prevents failure of hypervisor or physical server from causing failure of hosted virtual servers and IT resources

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