Browse Prior Art Database

Global Status Device State Machine (GSDSM)

IP.com Disclosure Number: IPCOM000015892D
Original Publication Date: 2002-May-01
Included in the Prior Art Database: 2003-Jun-21

Publishing Venue

IBM

Abstract

Global Status Device State Machine A program is disclosed which allows global data to be stored on a disk subsystem where the data will not be lost due to a single point of failure or power failure. The state machine in Figure 1 details the program method which allows a dynamic response to disk failures and provides a recovery method to restore the global status data following a power failure. The restoration of the global status data is executed during a machines initial microcode load in order to provide the data required in recovering the previous operating state of the machine. The two methods described in the Global Status Device State Machine are Establish and Reassign. Figure 1 Establish