Adding individual database failover/switchover to an existing storage component with limited impact

US8275907B2 · kind B2 · utility

Assignee

• Microsoft Corporation · US

Inventors

• Gregory Thiel · Black Diamond, US
• Alexander R. Wetmore · Seattle, US
• Ayla Kol · Sammamish, US
• Rebecca Benfield · Seattle, US
• James C. Kleewein · San Jose, US
• Naresh Sundaram · Redmond, US
• Yogesh Bansal · Sammamish, US
• Mark Wistrom · Redmond, US
• Manoharan Kuppusamy · Redmond, US

Key dates

• Filing date: Jun 26, 2008
• Grant date: Sep 25, 2012
• Expiry date: Apr 12, 2029

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L67/1095
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

High availability architecture that employs a mid-tier proxy server to route client communications to active data store instances in response to failover and switchover. The proxy server includes an active manager client that interfaces to an active manager in each of the backend servers. State information and configuration information are maintained separately and according to semantics consistent with needs of corresponding data, the configuration information changing less frequently and more available, the state information changing more frequently and less available. The active manager indicates to the proxy server which of the data storage instances is the currently the active instance. In the event that the currently active instance is inactive, the proxy server selects a different backend server that currently hosts the active data store instance. Client communications are then routed to the different backend server with minimal or no interruption to the client.