Network UPS Tools User Manual

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Network UPS Tools User Manual 29 / 84 6.4 Typical setups for enterprise networks and data rooms The split nature of this UPS monitoring software allows a wide variety of power connections. This chapter will help you identify how things should be configured using some general descriptions. There are two main elements: 1. There’s a UPS attached to a communication (serial, USB or network) port on this system. 2. This system depends on a UPS for power. You can play "mix and match" with those two to arrive at these descriptions for individual hosts: • A: 1 but not 2 • B: 2 but not 1 • C: 1 and 2 A small to medium sized data room usually has one C and a bunch of Bs. This means that there’s a system (type C) hooked to the UPS which depends on it for power. There are also some other systems in there (type B) which depend on that same UPS for power, but aren’t directly connected to it. Larger data rooms or those with multiple UPSes may have several "clusters" of the "single C, many Bs" depending on how it’s all wired. Finally, there’s a special case. Type A systems are connected to a UPS’s serial port, but don’t depend on it for power. This usually happens when a UPS is physically close to a box and can reach the serial port, but the wiring is such that it doesn’t actually feed it. Once you identify a system’s type, use this list to decide which of the programs need to be run for monitoring: • A: driver and upsd • B: upsmon (as slave) • C: driver, upsd, and upsmon (as master) To further complicate things, you can have a system that is hooked to multiple UPSes, but only depends on one for power. This particular situation makes it an "A" relative to one UPS, and a "C" relative to the other. The software can handle this - you just have to tell it what to do. Note NUT can also serve as a data proxy to increase the number of clients, or share the communication load between several upsd instances.
Network UPS Tools User Manual 30 / 84 If you are running large server-class systems that have more than one power feed, see the next section for information on how to handle it properly. 6.5 Typical setups for big servers with UPS redundancy By using multiple MONITOR statements in upsmon.conf, you can configure an environment where a large machine with redundant power monitors multiple separate UPSes. 6.5.1 Example configuration For the examples in this section, we will use a server with four power supplies installed. Two UPS, Alpha and Beta, are each driving two of the power supplies. This means that either Alpha or Beta can totally shut down and the server will be able to keep running. The upsmon.conf configuration that reflect this is the following: MONITOR ups-alpha@myhost 2 monuser mypass master MONITOR ups-beta@myhost 2 monuser mypass master MINSUPPLIES 2 With that configuration, upsmon will only shut down when both UPS reaches a critical (on battery + low battery) condition, since Alpha and Beta provide the same power value.
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Network UPS Tools User Manual

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