How We Host WordPress: Infinite Scale, Redundancy, and Code Audits

We thought it would be good to share a little behind-the-scenes look at our current setup at WPMU. We’ll also run down how much setting something like this up on your own will cost. If your site gets decent traffic, requires no downtime, or is designed for multiple users to be logged in at once (like Multisite, BuddyPress, or a Membership site), then this guide is for you!

Source: How We Host WordPress: Infinite Scale, Redundancy, and Code Audits