Network UPS Tools User Manual
Network UPS Tools User Manual
Network UPS Tools User Manual
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<strong>Network</strong> <strong>UPS</strong> <strong>Tools</strong> <strong>User</strong> <strong>Manual</strong> 11 / 84<br />
3.9.2 "Advanced" configuration<br />
One <strong>UPS</strong>, multiple computers. Only one of them can actually talk to the <strong>UPS</strong> directly. That’s where the network comes in. The<br />
Master system runs the driver, upsd, and upsmon in master mode. The Slave systems only run upsmon in slave mode.<br />
This is useful when you have a very large <strong>UPS</strong> that’s capable of running multiple systems simultaneously. There is no longer the<br />
need to buy a bunch of individual <strong>UPS</strong>es or "sharing" hardware, since this software will handle the sharing for you.<br />
3.9.3 "Big Box" configuration<br />
Some systems have multiple power supplies and cords. You typically find this on high-end servers that allow hot-swap and other<br />
fun features. In this case, you run multiple drivers (one per <strong>UPS</strong>), a single upsd, and a single upsmon (as master for both <strong>UPS</strong> 1<br />
and <strong>UPS</strong> 2)<br />
This software understands that some of these servers can also run with some of the supplies gone. For this reason, every <strong>UPS</strong> is<br />
assigned a "power value" - the quantity of power supplies that it feeds on a system. The total available "power value" is compared<br />
to the minimum that is required for that hardware. For example, if you have 3 power supplies and 3 <strong>UPS</strong>es, but only 2 supplies<br />
must be running at any given moment, the minimum would be 2. This means that you can safely lose any one <strong>UPS</strong> and the<br />
software will handle it properly by remaining online.
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