Dell UPS 1920R - Manual (Page 8)

Dell UPS Management Software: Common Software Installation Scenarios
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In an environment with multiple host servers, the centralized MUMC console enables safe shutdown of
servers, even servers in virtualized clusters running vCenter or XenCenter. It integrates with
hypervisors to manage multi-host virtualized installations. The software triggers migration applications
to transparently move virtual machines to an available server on the network, for data integrity and
zero downtime.
Configurations with just one physical server and one UPS would install one ULNM agent to support
graceful server shutdown during a power outage. Multi-server installations would have a local ULNM
agent on each physical server and the MUMC software on an administrator’s desktop or laptop PC to
monitor and manage power status, including remote or automatic shutdowns.
Scenario 1: Single UPS, multiple servers, USB or RS232 local
communication
In this scenario:
 Server 1 is powered by the Dell UPS and is connected to the Dell UPS by USB communications
(valid only for non-virtualized IT environments).
 Servers 2, 3 and 4 are also powered by the Dell UPS.
 Servers 2, 3 and 4 monitor Server 1’s agent for notification of events and shutdown.
 The Dell UPS Network Management card (NMC, Dell Part No. H910P) is not installed.
Scenario 1: Connectivity
Connect the Dell UPS to a server via either the USB cable (supplied) or DB-9 RS232 cable
(customer purchase option). For the DB-9 option, configure pin 2 for outbound transmission
from the UPS (Tx), pin 2 for inbound communication to the UPS (Rx), pin 5 to ground. The
remaining pins — 1, 4, 6, 7, 8 and 9 — are unused.
The server to which you make this connection is called the “primary” server. All other servers
are “secondary” servers and are assumed to be on the same customer LAN.