Network UPS Tools User Manual

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Network UPS Tools User Manual 11 / 84 3.9.2 "Advanced" configuration One UPS, multiple computers. Only one of them can actually talk to the UPS directly. That’s where the network comes in. The Master system runs the driver, upsd, and upsmon in master mode. The Slave systems only run upsmon in slave mode. This is useful when you have a very large UPS that’s capable of running multiple systems simultaneously. There is no longer the need to buy a bunch of individual UPSes or "sharing" hardware, since this software will handle the sharing for you. 3.9.3 "Big Box" configuration Some systems have multiple power supplies and cords. You typically find this on high-end servers that allow hot-swap and other fun features. In this case, you run multiple drivers (one per UPS), a single upsd, and a single upsmon (as master for both UPS 1 and UPS 2) This software understands that some of these servers can also run with some of the supplies gone. For this reason, every UPS is assigned a "power value" - the quantity of power supplies that it feeds on a system. The total available "power value" is compared to the minimum that is required for that hardware. For example, if you have 3 power supplies and 3 UPSes, but only 2 supplies must be running at any given moment, the minimum would be 2. This means that you can safely lose any one UPS and the software will handle it properly by remaining online.
Network UPS Tools User Manual 12 / 84 3.9.4 "Bizarre" configuration You can even have a UPS that has the serial port connected to a system that it’s not feeding. Sometimes a PC will be close to a UPS that needs to be monitored, so it’s drafted to supply a serial port for the purpose. This PC may in fact be getting power from some other UPS. This is not a problem. The first system ("mixed") is a Master for UPS 1, but is only monitoring UPS 2. The other systems are Slaves of UPS 2. 3.10 Image credits Thanks to Eaton for providing shiny modern graphics. 3.11 Compatibility information 3.11.1 Hardware The current list of hardware supported by NUT can be viewed here. 3.11.2 Operating systems This software has been reported to run on: • Linux distributions, • the BSDs, • Apple’s OS X, • Sun Solaris, • SGI IRIX, • HP/UX, • Tru64 Unix,
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Network UPS Tools User Manual

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