Google Inc. (NASDAQ:GOOG) is one of the biggest cloud companies in the world today. Google is constantly monitoring the reliability of GMail, Google Apps, and all of their other services that they provide whether it is available for free or for a fee. Every millisecond that a service goes offline is logged.
Google reported that GMail has been available for more than 99.9% of the time for all paid customers and free users. Google had one major outage in August 2008, but that was about it.
“If you average all these data together, including the August outage, across the entire Gmail service, there has been an aggregate 10-15 minutes of downtime per month over the last year of providing the service,” stated Matthew Glotzbach, Product Management Director of Google Enterprise. “That 10-15 minutes per month average represents small delays of a couple of seconds here and there.”
Based on these numbers, GMail is 2x more reliable than Novell GroupWise and 4x more reliable than Microsoft Exchange server. Google is so confident about their reliability that they are extending their 99.9% service level agreement to Google Calendar, Google Docs, Google Sites, and Google Talk for Premier Edition customers. This affects about 1 million of Google’s Apps businesses.
Google also depends on the reliability of their Premier Apps services because they are also one of the million of businesses that run on it.