Google explains why Gmail, Youtube and other services suffered outage

Google services including Gmail, YouTube, Google Drive and others stopped working for users across the globe on Monday. The search giant has now explained in the blog the reason behind the massive outage that crippled some of the major services offered by Google. The company explained that Google's automated storage quota management system was the major cause behind the global outage.“Google uses an evolving suite of automation tools to manage the quota of various resources allocated for services. As part of an ongoing migration of the User ID Service to a new quota system, a change was made in October to register the User ID Service with the new quota system, but parts of the previous quota system were left in place which incorrectly reported the usage for the User ID Service as 0. An existing grace period on enforcing quota restrictions delayed the impact, which eventually expired, triggering automated quota systems to decrease the quota allowed for the User ID service and triggering this incident. Existing safety checks exist to prevent many unintended quota changes, but at the time they did not cover the scenario of zero reported loads for a single service,” Google said in its blog.