Amazon’s Web Services experienced another hiccup today. Early this morning, its Elastic Compute Cloud (EC2) went down for about an hour for at least some customers in the U.S. This follows a major outage of its S3 storage service in February. Companies big and small use EC2 as a virtual data center to run jobs on Amazon’s computers. Customers began reporting problems on the EC2 developer forum at 1:51 AM PT. The problem seemed to be resolved about an hour and a half later.

Amazon does not guarantee 100 percent uptime for its Web Services, although it does strive to achieve that. And data centers go down all the time, no matter who is hosting your data. But more and more companies are relying on Amazon to be able to scale their…