Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2006-07-18
2006-07-18
Portka, Gary (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S156000, C714S006130
Reexamination Certificate
active
07080196
ABSTRACT:
A RAID apparatus and an access control method thereof includes same logical volumes allocated to a plurality of physical disk units. The RAID apparatus includes a plurality of physical disk units storing same logical volumes, and a disk controller accesses a particular logical volume by accessing any physical disk unit which stores the particular logical volume. The disk controller includes a memory storing the number of operations requested of each physical disk unit, for each physical disk unit, and a control circuit accessing one of the plurality of physical disk units which stores the particular logical volume, in accordance with the number of operations. Since a physical disk unit is selected in accordance with the numbers of operations of the individual physical disk units, balanced access to the physical disk units is accomplished.
REFERENCES:
patent: 5375217 (1994-12-01), Jibbe et al.
patent: 5408634 (1995-04-01), Joho
patent: 5537567 (1996-07-01), Galbraith et al.
patent: 5542064 (1996-07-01), Tanaka et al.
patent: 5568629 (1996-10-01), Gentry et al.
patent: 5636356 (1997-06-01), Kakuta et al.
patent: 5680574 (1997-10-01), Yamamoto et al.
patent: 5708668 (1998-01-01), Styczinski
patent: 5768623 (1998-06-01), Judd et al.
patent: 5778426 (1998-07-01), DeKoning et al.
patent: 5809516 (1998-09-01), Ukai et al.
patent: 5819310 (1998-10-01), Vishlitzky et al.
patent: 5859965 (1999-01-01), Gittins et al.
patent: 5872906 (1999-02-01), Morita et al.
patent: 5915095 (1999-06-01), Miskowiec
patent: 0 485 110 (1992-05-01), None
patent: 60-205641 (1985-10-01), None
patent: 3-253933 (1991-11-01), None
patent: 6187101 (1994-07-01), None
Patent Abstract of Japan, Kitajima Hiroyuki, “Method and Device for Controlling Storage Device”, Publication Date May 11, 1991, Publication No. 03246713, Japanese Application No. 02042452, Feb. 26, 1980.
The RAIDBook, A Source Book for RAID Technology, Edition 1-1, published by the RAID Advisory Board, St. Peter, MN, Nov. 18, 1993.
Yuji Ogawa et al., “F6401A Magnetic Disk Array Unit”, Fujitsu Science Technology Journal, 31, 1, pp. 18-28 (Jun. 1995).
Hitoshi Matsushima, et al., “F1710A File Control Unit and F6493 Array Disk Subsystem”, Fujitsu Science Technology Journal, 31, 1, pp. 29-35 (Jun. 1995).
English Translation of Japanese Patent Office Action for Patent Application No. Heisei 9 nen 004427, issued May 30, 2002.
Communication including Search Report from the European Patent Office mailed Mar. 18, 2004 for the corresponding European Application.
U.S. Appl. No. 10/619,597, filed Jul. 16, 2003, Yoshio Kitamura, Fujitsu Limited, Kawasaki, Japan.
Fujitsu Limited
Portka Gary
Staas & Halsey , LLP
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