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Chapter 8: Power and Environment
8.2 Uninterruptible Power Supply Control (UPS)
The Console Servers manage UPS hardware using Network UPS Tools (refer Section 8.2.6 for an overview of embedded open
source Network UPS Tools - NUT software)
8.2.1 Managed UPS connections
A
Managed UPS
is a UPS that is connected by serial or USB cable or by the network to the Console Server. The Console
Server becomes the Master of this UPS, and runs a upsd server to allow other computers that are drawing power through the
UPS (Slaves) to monitor its status and take appropriate action (such as shutdown in event of low battery).
The Console Server may or may not be drawing power through the Managed UPS (see the
Configure UPS powering the
Console Server
section below).
When the UPS's battery power reaches critical, the Console Server signals and waits for Slaves to shutdown, then powers off
the UPS.
Serial and network connected UPS’s must first be configured on the Console Server with the relevant serial control ports
reserved for UPS usage, or with the UPS allocated as a connected Host:
•
Select
UPS
as the Device Type in the
Serial & Network: Serial Port
menu for each port which has Master control over a
UPS and in the
Serial & Network: Network Hosts
menu for each network connected UPS (refer to
Chapter 4
)
No such configuration is required for USB-connected UPS hardware.