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Method for Power-Failure Shutdown and Restore

IP.com Disclosure Number: IPCOM000112763D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 43K

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Jones, CA: AUTHOR [+2]


Disclosed is a method for performing server shutdown and restore in the event of power failure.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 69% of the total text.

Method for Power-Failure Shutdown and Restore

      Disclosed is a method for performing server shutdown and
restore in the event of power failure.

      An Uninterruptible Power Supply (UPS) is a device that provides
emergency power to an electronic unit when the normal AC power supply
has failed or is irregular.  This device is critical to network
operations, especially in the case of network server machines.  Most
network software vendors provide a program to monitor signals from
the UPS, and, if necessary, perform operations on the host computer
to prevent data loss.  The basic UPS signals include "AC power has
failed" and "UPS battery is low".

      In IBM OS/2* LAN Server, a UPS service is provided that
monitors UPS signals.  This service shuts down, in a non-corruptive
manner, software running on a server machine.  However, this shutdown
only occurs when the UPS has signalled that the battery is low.  The
typical UPS only has two minutes of power remaining after the "low
battery" mark is reached.  This time is often insufficient to fully
stop all software running on the server, potentially causing data
loss or corruption.

      The OS/2 LAN Server UPS service and device driver were modified
to solve this problem.  This software was modified to allow
configuration of the shutdown sequence.  Shutdown may be performed at
initial power loss, or at low-battery time.

      For the new case of shutdown at initial power loss, the
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