Browse Prior Art Database

AC Power Disturbance Detection in Direct Access Storage Subsystems

IP.com Disclosure Number: IPCOM000115764D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Hancock, BA: AUTHOR [+2]

Abstract

A process is described for distinguishing between errors in Direct Access storage Subsystems which are caused by temporary external AC power line disturbances, for example during thunderstorms, and errors that are caused by failing hardware components. With this process, unnecessary service calls and hardware repair actions can be reduced.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 80% of the total text.

AC Power Disturbance Detection in Direct Access Storage Subsystems

      A process is described for distinguishing between errors in
Direct Access storage Subsystems which are caused by temporary
external AC power line disturbances, for example during
thunderstorms, and errors that are caused by failing hardware
components.  With this process, unnecessary service calls and
hardware repair actions can be reduced.

      Direct Access Storage Subsystems utilize multiple Direct Access
Storage Devices (DAS devices) attached to a Storage Control Unit
(SCU), which connects to one or more Host Processors.  Errors are
detected and reported to the SCU which collects an analyzes the error
data to determine if a hardware repair action is required.  If a
hardware repair action is required, a service alert is issued to the
Host processor to inform the Customer that a repair action is
required [*].

      A power supply failure in a DAS device will prevent the DAS
device from responding to commands from the SCU.  As a result, a
service alert will be issued and the failing power supply replaced.
Temporary AC power line disturbances can also prevent DAS devices
from responding to commands from the SCU.  If this possibility is not
taken  into account, error analysis will erroneously conclude that
power supplies in multiple DAS devices have failed, and issue a
service alert for each of the DAS devices that were affected by the
disturbance.

      A process for detecting...