For what it's worth, I ran a trivially complex system on Rackspace cloud about a year ago and it was a total clusterfuck. My machines were rebooted all the time and I would receive e-mails saying they were rebooted by Rackspace because of infrastructure issues or maintenence. I'd say this happened once every 2-3 weeks and I was only running 3 servers. This was a hobby project so to have to drop what I was doing every 2-3 weeks to reinitialize a server was a huge pain. I eventually shut it all down and switched to Linode just so I didn't have to worry about them randomly rebooting my machines all the time.
I've ran much larger clusters on EC2 over the last several years (50+ servers) and can count on my fingers the times that machines have been rebooted. And when they have, it's due to a lightning strike or a AWS failure that's reasonably explainable.
I've ran much larger clusters on EC2 over the last several years (50+ servers) and can count on my fingers the times that machines have been rebooted. And when they have, it's due to a lightning strike or a AWS failure that's reasonably explainable.