When to use different number of instances in two different availability zones?

Question

Currently figuring out how to use availability zones and came across this aws article:

https://docs.aws.amazon.com/elasticloadbalancing/latest/userguide/how-elastic-load-balancing-works.html

In it shows two availability zones, one with 2 instances and one with 8. When might a user choose to do this as opposed to having an even or close to even number of instances, like 5 and 5?

takahash · Accepted Answer

Hi.There are cases like,

1.The company owns RI tied to one specific AZ and still has room to spare, so we want to set up as many instances as possible in that AZ, but capacity is not a problem if the AZ with more instances fails.

2.New instance type with better performance has shortage in one specific AZ, so there are difference about number of instances bw AZs due to instance type's performance efficiency.

When to use different number of instances in two different availability zones?

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