Storage subsystem and its controlling method

Details Storage subsystem and its controlling method Storage subsystem and its controlling method

2005-01-11

2005-01-11

Nguyen, Hiep T. (Department: 2187)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S165000

Reexamination Certificate

active

06842835

ABSTRACT:
A storage subsystem in which write data written in a first storage subsystem from a plurality of host computers is copied onto a second storage subsystem, thereby protecting the write data in a multiplex manner. Disclosed are a storage subsystem and its controlling method in which the first storage subsystem has a storage control unit which sets a first threshold for controlling for each of the host computers an occupancy ratio of the write data whose copy to the second storage subsystem is incomplete in a data buffer in the first storage subsystem, and has control logic for delaying the processing of a data write request from each of the host computers on the basis of the first threshold.

REFERENCES:
patent: 6611903 (2003-08-01), Fujimoto et al.
patent: 6725293 (2004-04-01), Nakayama et al.
patent: 20020049746 (2002-04-01), De Roose
patent: 20020156942 (2002-10-01), Tyndall
patent: 20020174139 (2002-11-01), Midgley et al.

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