G - Physics – 06 – F
Patent
G - Physics
06
F
354/246
G06F 12/00 (2006.01) G06F 11/14 (2006.01) G06F 11/16 (2006.01)
Patent
CA 2020273
ABSTRACT OF THE DISCLOSURE A method and apparatus for transferring data between two storage media, and is used in an illustrative embodiment to transfer data between two storage media in a shadow set, the storage media being accessible to one or more host processors. The method of the preferred embodiment includes the steps of: A. receiving a command from one of the host processors, the command specifying data to be transferred from a first storage medium to a second storage medium; B. transferring the data specified in the command received from the host from the first storage medium to the second storage medium in a series of subtransfers, each of the subtransfers transferring a portion of the data; and C. processing one or more I/O requests to the shadow set received from one or more host processors by, for each received I/O request: a. implementing the I/O request if the I/O request does not involve a section of the shadow set currently involved in one of the subtransfers; and b. stalling the I/O request if the I/O request involves a section of said shadow set currently involved in one of the subtransfers, and implementing the I/O request when the subtransfer has completed. (0192u)
Bean Robert G.
Davis Scott H.
Goleman William L.
Thiel David W.
Zahrobsky James A.
Bean Robert G.
Davis Scott H.
Digital Equipment Corporation
Goleman William L.
Smart & Biggar
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