US 7,581,062 B2
Disk array system
Hiroshi Ogasawara, Odawara (Japan); Homare Kanie, Yokohama (Japan); Nobuyuki Saika, Yokosuka (Japan); Yutaka Takata, Ninomiya (Japan); and Shinichi Nakayama, Chigasaki (Japan)
Assigned to Hitachi, Ltd., Tokyo (Japan)
Filed on Dec. 28, 2007, as Appl. No. 12/3,597.
Application 12/003597 is a continuation of application No. 11/448733, filed on Jun. 08, 2006, granted, now 7,376,787.
Application 11/448733 is a continuation of application No. 11/046719, filed on Feb. 01, 2005, granted, now 7,099,996.
Application 11/046719 is a continuation of application No. 10/806128, filed on Mar. 23, 2004, granted, now 7,043,604.
Claims priority of application No. 2003-394922 (JP), filed on Nov. 26, 2003.
Prior Publication US 2008/0114933 A1, May 15, 2008
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 12/00 (2006.01); G06F 13/00 (2006.01); G06F 13/28 (2006.01)
U.S. Cl. 711—114  [711/112] 27 Claims
OG exemplary drawing
 
1. A disk storage system, comprising:
a plurality of hard disk drives for storing data and being divided to include first, second, and third logical units;
at least one disk control unit for controlling storage of data in said plurality of hard disk drives;
a plurality of channel control units for receiving data from an external network;
a connection unit being connected with said channel control units and said at least one disk control unit;
a cache memory for temporarily saving data to be transferred to and from said disk control unit; and
a management terminal connected to said channel control units and said at least one disk control unit, said management terminal being configured to manage storage of data in said disk storage system, wherein
each of said channel control units includes an I/O processor transmitting a block access,
the first logical unit stores data for the block access transmitted from the I/O processor,
the second logical unit stores information of statuses of a plurality of said I/O processors which is used when a processing is succeeded between a first one and a second one of the I/O processors, each of the second and third logical units are connected with each of the first and second I/O processors to be shared thereby,
the management terminal indicates to the second logical unit a definition of a path therefrom to said second logical unit and a definition of a path therefrom to said third logical unit which backs-up data stored in the second logical unit, and
one of the first and second I/O processors assumes the processing of the other if a failure occurs in the other of the first and second I/O processors by using information stored in said second logical unit and the definition of the path to said second logical unit.