In a former role, I used EC2 in us-east-1 to host the front door e-commerce site for a consumer electronics company. AWS suggested that we go through the Infras

In a former role, I used EC2 in us-east-1 to host the front door e-commerce site for a consumer electronics company. AWS suggested that we go through the Infrastructure Event Mangaement process (https://aws.amazon.com/premiumsupport/programs/iem/ https://aws.amazon.com/premiumsupport/programs/iem/) for Black Friday and Cyber Monday, so that staff on Amazon's side could guarantee that they'd have capacity to run our system at its forecasted peak. The strategy they helped us arrive at was two-pronged: 1. Pre-launch all needed infrastructure. Yes, for all their "cloud scale", it was actually suggested that we preallocate all of our servers the week before, rather than rely on autoscaling. 2. Order capacity reservations for all of those instances (https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-capacity-reservations.html https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-capa...). This ensure that, if any of those instances go bad, we'd be able to relaunch them without going to the back of the line, and finding out that there was no more compute capacity available.