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Deterministic Method to Control a Single Backup Power Status Indicator in a System with Multiple Backup Power Islands

IP.com Disclosure Number: IPCOM000032745D
Original Publication Date: 2004-Nov-11
Included in the Prior Art Database: 2004-Nov-11
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Abstract

In systems that have multiple components that use distinct backup power sources, when the system transitions to backup power there will likely be differences in the state of the backup power sources. In an implementation that only provides a single status system status indicator, it is important that the indicator provide status for the most limiting condition else a portion of the system may fail without providing adequate warning to the user.

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Deterministic Method to Control a Single Backup Power Status Indicator in a System with Multiple Backup Power Islands

In a system with clustered system controllers and backup power sources that have an affinity with a subset of the system, when the system transitions to backup power it is important to provide status indication of the most limiting backup power source. If that most limiting status is not presented, a system failure can occur without any forewarning by the status indicator. The figure below describes a system configuration that has multiple backup power islands (0 & 1) where the backup power source only provides power to its associated system controller node (0 or 1). A communication path exists between each system controller and its associated backup power source. A communication path also exists between the system controllers. Each backup power source has an indicator control path to the single system backup power status indicator. The system controllers use the following method to control the backup power status indicator.

At a specified periodicity the each system controller independently queries its' associated backup power source and reads it capacity level. One of the system controllers is designated the master controller for common functions (in this case we will assume system controller 0). The master controller queries the subordinate controllers (in this case we will assume system controller 1) to report the capacity level of its backup...