Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
1999-01-15
2001-08-28
Nguyen, Hiep T. (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S162000, C707S793000, C714S006130, C714S011000
Reexamination Certificate
active
06282610
ABSTRACT:
FIELD OF THE INVENTION
The present invention pertains to the field of computer systems. More particularly, the present invention relates to storage controllers for controlling data transfers between one or more host processing systems and one or more data storage subsystems.
BACKGROUND OF THE INVENTION
Computer systems sometimes handle valuable or irreplaceable data. Data maintained by a computer system may be of vital importance, for example, in business applications such as airline reservations, bank account management, electronic funds transfers, shipping and receiving, and inventory control. Consequently, there is a need to ensure that valuable data is adequately protected against loss or damage.
It is common to store large volumes of data on non-volatile mass storage devices, such as magnetic or optical disks. Occasionally, however, a mass storage device will fail, resulting in the loss of stored data. Consequently, it is a common practice to store a back-up copy of data that is considered valuable on a separate, back-up storage device. For practical reasons, however, it is often necessary to locate the back-up storage device in the same geographic vicinity as the primary storage device. As a result, both the primary data and the back-up copy may be lost or destroyed due to fire, theft, vandalism, or natural disaster. Hence, there is a need for the capability to store multiple back-up copies of data in geographically separate locations, while still permitting quick and easy access by a host computer to any back-up copy.
SUMMARY OF THE INVENTION
One aspect of the present invention is a storage controller which includes a processor and a memory. The memory includes instructions which configure the storage controller to receive a single copy of data from a remote storage controller, and to store multiple copies of the data in a local storage facility based on the single copy. Other features of the present invention will be apparent from the accompanying drawings and from the detailed description which follows.
REFERENCES:
patent: 5530845 (1996-06-01), Hiatt et al.
patent: 5799141 (1998-08-01), Galipeau et al.
patent: 5857208 (1999-01-01), Ofek
patent: 5953729 (1999-09-01), Cabrera et al.
patent: 6052797 (2000-04-01), Ofek et al.
LSI Logic Corporation
Nguyen Hiep T.
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