18 Questions
In a failover system mechanism, what is the purpose of using established clustering technology?
To increase the reliability and availability 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
What is the purpose of a load balancer in an active-active configuration?
To distribute the workload among active systems and exclude failed instances
How does a failover system in a cloud environment help achieve high availability?
By actively monitoring for errors and unavailability conditions
What are the two types of configurations mentioned in the text for a failover system?
Active-active and active-passive configurations
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
What happens in the event of a primary storage device failure in cloud computing?
Cloud consumer requests are diverted to the secondary device
Which Microsoft Azure storage model offers three synchronous copies in a single data center?
Locally redundant storage (LRS)
What is the consequence of a hypervisor failure in a virtual server environment?
All hosted virtual servers fail
What is the purpose of a high-availability cluster in hypervisor clustering architecture?
To ensure continuous operation in case of failures
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
What is the consequence of load balancing across multiple clouds if one cloud experiences a failure?
Traffic is rerouted to the remaining operational clouds
What is the purpose of creating multiple instances of the same IT resource?
To improve the performance of the virtual server
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
In a high-availability architecture, how are stored VM images handled between data centres?
They are replicated between data centres
What is the function of a load balancer in cloud architecture?
To automatically distribute incoming traffic across multiple instances
How does a load balancer contribute to preventing overload in cloud environments?
By distributing incoming traffic according to predefined rules
What role does hypervisor clustering architecture play in ensuring virtual server availability?
Replicating multiple instances of a virtual server to improve availability
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
Learn about how the failover system mechanism is used to enhance the reliability and availability of IT resources by implementing redundant instances that are actively monitored for errors and unavailability conditions. Discover how this technology ensures continuous service provision even if one instance fails.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
