Patent ID: 6088697
Filing Date: 2000-07-11
Classification: G06F

Abstract:
An extended remote copying system, comprising:(a) a primary processor executing at least one computer program that generates write I/O operations;(b) a primary storage subsystem coupled to the primary processor and comprised of one or more primary storage controllers and one or more primary data volumes for performing the write I/O operations generated by the computer program; and(c) a primary data mover executed by the primary processor for monitoring changes made to the primary data volume resulting from the write I/O operations, indicating the changes to the primary data volume in a data structure, performing a multi-level analysis to determine whether one of at least two thresholds has been exceeded, discarding indication in the data structure of the changes that have been applied to a secondary data volume if one of the thresholds has been exceeded, wherein changes that have not been applied to the secondary data volume are maintained in the data structure.