Steeleye Technology, Inc.

James E J Bottomley

For a highly available replication system, a process is presented whereby, after a successful failover from primary to replica, with the replica now being the new primary, and where, at a later time, the original primary is subsequently restored to operation, a subset close to the minimal possible subset of data that needs to be transferred between the new and original primaries can be computed.

Remote asynchronous mirror recovery

A method whereby a transaction log is converted to an intent log and vice versa while the replication system is operating, thus allowing the replication system to operate primarily as a transaction log, but switch eventually to an intent log before an overflow condition of the transaction log occurs. The size of the hybrid log is tuned so that it remains a transaction log (with all the benefits) for commonly occurring small network outages but will convert to an intent log (and thus not overflow) if a prolonged outage occurs.

Growing community of inventors

Oswego, IL, United States of America

James E J Bottomley