Storage system

Details Storage system Storage system

2002-02-26

2008-10-14

Vaughn, Jr., William C. (Department: 2141)

Electrical computers and digital processing systems: multicomput

Multicomputer data transferring via shared memory

C709S214000, C709S215000, C711S147000, C711S151000

Reexamination Certificate

active

07437424

ABSTRACT:
In order to allow a host computer to specify an operable logical unit (LU), a storage system responds with extended LU information, including at least connection portion numbers, target IDs and logical unit numbers according to an inquiry made from the host computer. An external storage system adds extended LU numbers used in coupling as responses to inquiry commands to specified logical units. Owing to such addition, the host computer is capable of collecting responses of inquiry commands to special device files of all storage systems recognized by the host computer. It is thus possible to obtain a list of extended LU numbers corresponding to all logical units recognized by the host computer. Since such an external storage system using LUN security is capable of effecting coupling operations only on logical units recognized by the host computer, security is enhanced.

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