Amazon Web Serviceを暫く運用していると、突然Amazon EC2 Teamより、下の様なメールが送られてきてびっくりする事があります。 Hello, We have noticed that one or more of your instances are running on a host degraded due to hardware failure. i-12345678 The host needs to undergo maintenance and will be taken down at 12:00 GMT on 2010-06-XX. Your instances will be terminated at this point. The risk of your instances failing is increased at this poin