The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 13, 2004
Filed:
Jan. 11, 2001
Trevor Hall, Glossop, GB;
Fujitsu Services Limited, Slough, GB;
Abstract
A computer system has at least two processing nodes and a shared data storage system comprising a number of storage units. Each storage unit has a logical unit number (LUN). A first of the processing nodes stores a maximum LUN value in non-volatile storage, and is arranged to perform, on boot-up, a device discovery procedure in which it scans the shared data storage system to find storage units with LUNs not greater than the maximum LUN value. A second of the processing nodes stores a start LUN value in non-volatile storage, and is arranged to perform, on boot-up, a device discovery procedure in which it scans the shared data storage system to find storage units with LUNs not less than the start LUN value. This allows LUN masking to be achieved relatively inexpensively with only minimal modification to the operating systems of the processing nodes, using existing device discovery features of the operating system.