Cisco Technology, Inc.

Mimosa Systems, Inc.

Dhanesh Joshi

Shweta Manohar Behere

Sean Hagan

Song Lu

Jonathan S Gorlin

Amol Tasgaonkar

A flexible witness service system architecture is provided that comprises one or more cluster sites each having at least two storage/compute nodes; at least one local external device associated with at least one of the one or more cluster sites, the at least one local external device configured to run a local witness service. A central cloud management platform is in communication with the one or more cluster sites, the central cloud management platform being configured to run a cloud witness service. The local witness service and the cloud witness service perform identical arbitration services if a storage/compute node in one of the one or more cluster sites fails or communication between storage/compute nodes in a cluster fails.

Techniques to provide a flexible witness in a distributed system

Database backup system identifies and extracts any changed database record using only two copies of the database from two different points in time. A first copy of the database is generated at a first time. Copies of log files including changes to the database since the first time are generated at a second time. The copy of the log files is applied to the database copy, and any changed blocks of the first copy of the database are identified. The changed blocks and a second copy of the database are used to identify changes to any record of the database between the first and second time. An archived database is generated and updated over time by archiving only data of any record that subsequently changes. Restoration of the database to a state corresponding to any point in time uses only the archived database and data of changed data records.

Determining database record content changes

Growing community of inventors

Cupertino, CA, United States of America

Dhanesh Joshi