| US 7,581,060 B2 | ||
| Storage device control apparatus and control method for the storage device control apparatus | ||
| Hiroki Kanai, Odawara (Japan) | ||
| Assigned to Hitachi, Ltd., Tokyo (Japan) | ||
| Filed on Nov. 20, 2007, as Appl. No. 11/984,570. | ||
| Application 11/984570 is a continuation of application No. 11/606878, filed on Dec. 01, 2006, granted, now 7,320,051. | ||
| Application 11/606878 is a continuation of application No. 10/654996, filed on Sep. 05, 2003, granted, now 7,231,490. | ||
| Claims priority of application No. 2003-111405 (JP), filed on Apr. 16, 2003. | ||
| Prior Publication US 2008/0209101 A1, Aug. 28, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G06F 13/00 (2006.01) | ||
| U.S. Cl. 711—112 [711/147; 711/154] | 21 Claims |
| 1. A storage device control apparatus comprising:
a plurality of channel control units, each with a host interface controller formed therein for receiving data input/output
(I/O) requests from a first host computer;
a plurality of disk control units, each with a disk interface controller formed therein for performing I/O control of data
to first storage volumes storing data in response to the data I/O requests;
a plurality of storage control units, each with a host interface controller for receiving data I/O requests from a second
host computer, a disk interface controller for performing I/O control of data to second storage volumes, and a memory formed
therein for temporarily storing data being transferred between said host interface controller and said disk interface controller;
and
an internal connection part which is able to connect to and/or disconnect from each of said channel control units, said disk
control units, and said storage control units independently,
wherein, upon receipt of a data I/O request from the first host computer to a channel control unit, said host interface controller,
included in said channel control unit, analyzes the data I/O request, and based on the analysis, determines whether the data
I/O request is a read request or a write request, determines an address of data to be accessed, and sends a command according
to whether the data I/O request is a read request or a write request to one of the disk control units, and
wherein, upon receipt of a data I/O request from the second host computer to a storage control unit, said host interface controller,
included in said storage control unit, analyzes the data I/O request, and based on the analysis, determines whether the data
I/O request is a read request or a write request, determines an address of data to be accessed, sends a command according
to whether the data I/O request is a read request or a write request to said memory if the data to be accessed is stored in
said memory, and sends a command according to whether the data I/O request is a read request or a write request to the disk
interface controller included in said storage control unit if the data to be accessed is not stored in said memory.
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