I will be deploying new redundant power strips inside the Austin Colo on Saturday, July 15. The window will begin around 8PM Central time. It should take less than 2 hours to complete.
The most noticeable disruption will be the power cycling of our main router which will take about 10 minutes for it to reboot. During this time, all systems in the colo will be on, but won't be reachable externally.
I'll then be updating each network switch. Each one will knock off a different set of users during the time it takes to reboot (a couple of minutes at most).
Finally I'll be rebooting a few infrastructure servers. The only noticeable one of this list will be the US Developer Cloud's primary network node. During this reboot all systems will lose internal and external access to the Internet.