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. 03, 2001
Filed:
Feb. 12, 1999
Denis Pinson, Goupillieres, FR;
Bull, S.A., Louveciennes, FR;
Abstract
The system comprises a central processing unit (CPU) associated with one or more input-output controllers (Ctl,-Ctl,) and a subsystem of redundant disks (MD) divided into logic units and under the control of two redundant disk controllers (SP-A, SP-B). The latter are attached to the input-output controller(s) through equally redundant busses. A first part of the logic units is assigned to the first disk controller (SP-A) and the other part to the second disk controller (SP-B). When a logic unit assigned to the first disk controller (SP-A) is accessed, the state of the second disk controller (SP-B) is supervised through the backup path. In the event that a failure state of the second disk controller (SP-B) is detected, all of the logic units are switched to the first one (SP-A) and are assigned to it. A degraded operating mode is initiated and access to the resources is gained through the backup path.