8.6. Failover System  ( Specialized Cloud Mechanisms Unit 3 chapter 1)
Channel: BANSODE TECH SOLUTION
Date: 2022-01-11

8.6. #Failover #System  ( #Specialized #Cloud #Mechanisms #Unit 3 #chapter 1) 
https://youtu.be/8UN4UopJQVE

The failover system mechanism is used to increase the #reliability and #availability of IT resources by using established clustering technology to provide redundant implementations. A failover system is configured to automatically switch over to a #redundant or standby IT resource instance whenever the currently active IT resource becomes unavailable.
Failover systems are commonly used for #mission-critical programs and reusable services that can introduce a single point of failure for multiple #applications. A failover system can span more than one geographical region so that each location hosts one or more redundant implementations of the same IT resource.
The resource replication mechanism is sometimes utilized by the failover system to provide redundant IT resource instances, which are actively monitored for the detection of #errors and unavailability conditions.
Failover systems come in two basic #configurations:
1. Active-Active
2. Active-Passive

#Active-Active
In an active-active configuration, redundant implementations of the IT resource actively serve the workload synchronously (Figure 8.17). Load balancing among active instances is required. When a failure is detected, the failed instance is removed from the load balancing scheduler (Figure 8.18). Whichever IT resource remains operational when a failure is detected takes over the processing(Figure 8.19).

#Active-Passive
In an active-passive configuration, a standby or inactive implementation is
activated to take over the processing from the IT resource that becomes
unavailable, and the corresponding workload is redirected to the instance taking over the operation (Figures 8.20 to 8.22



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