STORAGE CONTROLLER AND DATA STORAGE SYSTEM INCLUDING THE SAME AND DOUBLE PAIR SUPPRESSING METHOD

Japanese Patent JP3655963

B2

PROBLEM TO BE SOLVED: To provide a data storage system for suppressing plural double pairs across a single or plural storage sub-systems like an atomic.
SOLUTION: A double pair is suppressed so that data can be maintained on their secondary DASD 7 in a sequence matching sequence. A host processor generates a record to be written in a primary DASD 4 of the double pair and record update. A storage controller instructs the copy of the record and the record update to the secondary DASD 7 of the double pair. The sequence compatibility can be maintained in the secondary DASD 7 by suppressing the double pair. During the suppression of the double pair, progressing writing I/O is also completed to the primary DASD. The storage controller generates a long busy signal for the following writing request for rejecting the following writing I/O from the host processor. During the suppression of the double pair due to the change of the recording, an application instructs the storage controller to mark the physical address of the primary DASD to be updated between the suppressing time and a resetting time.

James Lincoln Iskiyan
Robert Frederick Cane
William Frank Micca
Robert Wesley Schommler

JP8856296A

June 02, 2005

April 10, 1996

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INTERNATIONAL BUSINESS MASCHINES CORPORATION

G06F12/16; G06F3/06; G06F11/20; G06F12/08; (IPC1-7): G06F3/06; G06F12/08; G06F12/16

JP5233162A
JP644120A
JP675890A

WO1994025919A1

IBMマニュアル“Strage Subsystem Library IBM 3990 Strage Control Reference Fifth Edition、September 1991”

Hiroshi Sakaguchi
Yoshihiro City
Takeshi Ueno

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