Emc Corporation

Denis Hall

Douglas Eric LeCrone

Daniel A Murphy

Paul A Linstead

Michael E Specht

Eugene D Pflueger

Kevin C Heasley

Raymond Wong

Stewart C Woodworth, Iii

A method and apparatus for monitoring update activity, particularly in the form of write requests, to a data storage facility, over at least one cycle to identify any write operation or update that occurs to that data storage facility on a track-by-track basis. At the end of each cycle a list of changed tracks is stored in a data set. After information has been accumulated by a collector application, a reporter application manipulates the data to obtain information concerning the track changes and to estimate communication path requirements.

Program for monitoring update activity in a data storage facility

A data-mirroring method in which, while an I/O process is processing a first I/O request for writing data to a first device, control is obtained from that I/O process executing on a host computer. A second I/O request, this one for writing the data to the second device, is then created. Then, control is returned to the I/O process by causing the first I/O request to be made available to a first data storage system managing the first device.

Intercepting control of a host I/O process

Method and apparatus for monitoring update activity in a data storage facility

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Chelmsford, MA, United States of America

Denis Hall