[Feature] Minimum Subnets: 3
todd-dsm opened this issue · 2 comments
What feature/behavior/change do you want?
I'd like to suggest the minimum number of subnets be changed from 2 -> 3; docs.
Why do you want this feature?
The SRE Handbook describes Capacity Planning like:
Provision to handle a simultaneous planned and unplanned outage, without making the user experience unacceptable; this results in an "N + 2” configuration, where peak traffic can be handled by N instances (possibly in degraded mode) while the largest 2 instances are unavailable.
While they are specifically describing nodes, the concept could be expanded to mean any fundamental resource. Given a stellar (but imperfect) history of AWS' uptime, it seems that three (3) would be an improved number to suit the foundational concept of a distributed system.
In this way, we could be slightly better off knowing that we could withstand an unplanned outage in the middle of a planned outage.
What say the council?
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