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Google Gmail for about two hours off Tuesday was the result of miscalculations in the ability of their system, the company said later Tuesday.

Gmail has declined from approximately 12:30 pm PDT Tuesday around 2:30 pm PDT, affecting millions of Gmail customers who depend on services for everything from fantasy football roster updates for business-critical information. The problem was caused by the classical cascade, in which the servers were overwhelmed movements in rapid succession.

According to Google, the problem began when he took several Gmail servers offline for maintenance, routine procedure, which is usually transparent to users. However, turning this time was that Google made some changes to the routers that direct traffic on the Gmail servers in the hope of improving reliability, and these changes failed.

"As we now know, we have slightly underestimated the burden that some of the recent changes (Ironically, some are designed to improve access to services) listed on the request of the routers - servers, direct requests to the appropriate web server to respond to Gmail," Google said in a Post Gmail on his blog late Tuesday.

"Around 12:30 pm Pacific several requests routers are overloaded and in fact told the rest of the system 'stop sending traffic, we are too slow, this is transferred to the load on the remaining routers query, resulting in some of them have also become overloaded, and a few minutes later, almost all requests routers were overwhelmed, "writes Ben Traynor, Vice President of Engineering and the King site reliability.

Google the problem is solved by allocating traffic to the rest of its vast network, is a luxury that she takes into account the resources that he put into place to work leading search engine in the world. But what next?

Google said it would focus on ensuring that request routers have sufficient reserves to handle future peak demand, and the way to make sure that problems in one sector may be identified without recourse to the work of the whole service. "We will work hard over the next few weeks, the implementation of these and other Gmail improve reliability - still more than 99,9% are available for all users, and we are committed to keeping the event as it is today distinguished by their rarity," wrote Traynor.

Some Google Apps customers who use Gmail for internal e-mail to their enterprises and organizations did not return calls Tuesday seeking information about the extent to which they were raised, which makes it difficult to know the value of failure. However, Google has a lot of time and money this year to promote Gmail as a background E-Mail Software alternative to products from Microsoft and IBM, and trouble, as it will not help him to sell services to other organizations.

"We know how many people rely on Gmail for personal and professional communications, and we take it very seriously when there is a problem with the service," wrote Traynor. "Thus, up to the front, I would like to apologize to all of you - off today was a big thing, and we are treating it as such."