Rackspace has worked fast and replaced the faulty hardware. Thank god for cloud servers. Chicago is back up after 20 minutes downtime.
We have received this message from RackSpace which is one of our service providers:
This message is to inform you that the host server your Cloud Server 'HamSphere Chicago' is on has suffered a hardware failure. We are in the process of troubleshooting this failure and we will need to take the host server offline to preserve data integrity. Once the issue has been resolved we will bring your Cloud Server back online. You will be notified once this has taken place.
The Rackspace Cloud