Importance

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Abstract

A computer network remote data mirroring system writes update data both to a local data device and to a local, chronologically sequenced journal storage area, or writelog device. If the local computer system crashes, upon recovery or re-boot of the local computer system, the two most current updates in the writelog device are written to the local data device to assure that the data stored on the local data device is current. Additional memory or disk space is dynamically assigned to the writelog device to prevent a memory overflow condition. The computer network remote data mirroring system can be structured to provide logical groups of local data device/writelog device pairs. A primary mirror daemon on a local computer system monitors the writelog device for data updates and feeds the data over a network in the same order in which it is stored to a receiving remote mirror daemon on a remote computer system, which in turn commits the data updates to a mirror device. Failure recovery with the primary and remote mirror daemons is initiated automatically for certain failures which do not affect the basic operability of the overall computer system. A graphical user interface enables a user to configure the logical groups and create throttles, as well as to monitor performance of the remote data mirroring system. Network bandwidth throttling enables a predetermined portion of the network bandwidth to be assigned to remote data mirroring based on user-selected criteria.

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First Claim