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Virtual Timed Power On a LPAR system

IP.com Disclosure Number: IPCOM000010320D
Original Publication Date: 2002-Nov-20
Included in the Prior Art Database: 2002-Nov-20

Publishing Venue

IBM

Abstract

Given an LPAR (Logical PARtitioned) system with a Service Processor (SP) that only has one Watch Dog Timer (WDT), one battery-backed Real Time Clock (RTC), and a secondary counter (SC), that supports TPO functionality, and that each LPAR partition keeps its own local time by a virtualized clock subsystem. TPO allows a system to power on automatically at a specific date and time.The implementation detailed in this document can be applied to provide Time the Power On (TPO) capabilities on LPAR systems above described. This will allow each LPAR partition to perceive the WDT facility as its own, so that each partition can achieve TPO independently. The advantage of this method is the savings of additional hardware (i.e. RTC, WDT) for TPO to be supported.