Storage device and method for data sharing

• US 20030149836A1
• Filed: 03/06/2003
• Published: 08/07/2003
• Est. Priority Date: 01/19/1996
• Status: Active Grant

• Current Assignee: Akira Yamamoto, Minoru Yoshida, Motohiro Kanda, Toshio Nakano
• Original Assignee: Akira Yamamoto, Minoru Yoshida, Motohiro Kanda, Toshio Nakano
• Inventors: Yamamoto, Akira, Yoshida, Minoru, Nakano, Toshio, Kanda, Motohiro
• Granted Patent: US 6,748,500 B2
• Time in Patent Office: Days
• US Class Current: 711/112
• CPC Class Codes: G06F 2003/0697 device management, e.g. handlers, drivers, I/O schedulers
• CPC Class Codes: G06F 3/0601 Interfaces specially adapted for storage systems
• CPC Class Codes: G06F 3/0607 by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
• CPC Class Codes: G06F 3/061 Improving I/O performance
• CPC Class Codes: G06F 3/064 Management of blocks
• CPC Class Codes: G06F 3/0661 Format or protocol conversion arrangements
• CPC Class Codes: G06F 3/067 Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
• CPC Class Codes: G06F 3/0674 Disk device
• CPC Class Codes: G06F 3/0676 Magnetic disk device
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

In a computer system including a disk subsystem having channel interface compatible to a count-key-data format and a SCSI interface compatible to a fixed length data format, the disk subsystem is connected to a CPU controlled by an open system operating system through the SCSI interface, and connected to an other CPU controlled by a main frame operating system through the channel interface. The CPU is provided with a CKD record access library and a VSAM access library which accesses in a FBA format the VSAM record stored by the other CPU in a CKD format in the disk subsystem and allows the access by an application program of the CPU as a VSAM record based on VSAM control information.

Claims

1. A computer system including a storage device having an interface compatible to a count-key-data format and an interface compatible to a fixed length data format comprising:

means for mutually transforming between a record address in the count-key-data format designated by a cylinder number, a head number and a record number and an address in the fixed length data format designated by a logical block address;

means for allowing the access to a record stored in said storage device in the count-key-data format by the interface compatible to the fixed length data format;

means for extracting only user data from said record; and

means for interpreting the user data of said record in accordance with a predetermined format for utilization.