The correct answer is: C. live migration of vm for load balancing
Service performance degrade is a case that impacts major system availability. This is because it can lead to users being unable to access the system or experiencing slow performance. Service outage by unplanned downtime is also a case that impacts major system availability. This is because it can lead to users being unable to access the system for an extended period of time. Service outage by planned downtime is a case that can impact major system availability, but it is not as likely to do so as unplanned downtime. This is because planned downtime is scheduled in advance, and users can be notified in advance so that they can make alternative arrangements. Live migration of vm for load balancing is a case that does not impact major system availability. This is because it is a process that is designed to improve system performance, not to degrade it.
Here is a more detailed explanation of each option:
- Service performance degrade: This is a case where the performance of a system decreases below an acceptable level. This can be caused by a number of factors, such as an increase in the number of users, a decrease in the capacity of the system, or a software bug. Service performance degrade can impact major system availability by making it difficult or impossible for users to access the system.
- Service outage by unplanned downtime: This is a case where a system is unavailable for an extended period of time due to an unexpected event. This can be caused by a hardware failure, a software bug, or a human error. Service outage by unplanned downtime can impact major system availability by making it difficult or impossible for users to access the system.
- Service outage by planned downtime: This is a case where a system is unavailable for a scheduled period of time for maintenance or upgrades. Planned downtime is typically announced in advance so that users can make alternative arrangements. Service outage by planned downtime can impact major system availability, but it is not as likely to do so as unplanned downtime.
- Live migration of vm for load balancing: This is a process where a virtual machine (VM) is moved from one physical server to another. This is done to improve the performance of the VM by moving it to a server that has more resources available. Live migration of vm for load balancing does not impact major system availability.