Richard Lee Coulson
Engineers at 25 Ave, Beaverton, OR
License number
Colorado 24105
Issued Date
Feb 14, 1986
Renew Date
Mar 1, 2002
Expiration Date
Feb 29, 2004
Type
Professional Engineer
Address
Address
2111 NE 25Th Ave, Beaverton, OR 97124
Professional information
Apparatus And Method For Achieving Improved Scsi Bus Control Capacity
US Patent:
5367647, Nov 22, 1994
Filed:
Jul 19, 1993
Appl. No.:
8/093452
Inventors:
Richard L. Coulson - Beaverton OR
Vincent G. O'Malley - Aloha OR
Robert J. Safranek - Portland OR
Vincent G. O'Malley - Aloha OR
Robert J. Safranek - Portland OR
Assignee:
Sequent Computer Systems, Inc. - Beaverton OR
International Classification:
G06F 1328
US Classification:
395325
Abstract:
An apparatus and a method facilitate the sharing of a SCSI address ID between a SCSI initiator and a target device. The SCSI standard does not prohibit ID sharing under a set of operating conditions defined by this invention. The shared ID is preferably used for controlling an environmental monitor device that controls the power of disk drives on the SCSI bus, detects their status and configuration, and monitors environmental conditions within a mass storage system cabinet. Power to individual disk drives is switched under control of the computer operating system so that start-up surge current to the disk drives is limited. This allows defective drives to be powered down and replaced without powering down the remaining good drives. SCSI termination power distribution is improved so that connector reversals can be detected and resulting current surges limited. Termination power control and status is under program control.