APC UPS control system manual Apcupsd Known USB Issues, Configuration types

powers a single computer. This is the most common configuration. If you’re working with just one machine and one UPS, skip the rest of this section.

Your choices become more interesting if you are running a small cluster or a big server farm. Under those circumstances, it may not be possible or even desirable to pair a UPS with every single machine. apcupsd supports some alternate arrangements.

The second type of configuration is a master/slave configuration, where one UPS powers several computers, each of which runs a copy of apcupsd. The computer that controls the UPS is called the master, and the other com- puters are called slaves. The master copy of apcupsd communicates with and controls the slaves via an Ethernet connection. This type of configu- ration may be appropriate for a small cluster of machines. Some example configuration files for the master and the slave machines can be found in the examples directory of the source distribution. The more recent examples are in master.apcupsd.conf and slave.apcupsd.conf.

The third configuration (new with version 3.8.3), is where a single computer controls multiple UPSes. In this case, there are several copies of apcupsd on the same computer, each controlling a different UPS. One copy of apcupsd will run in standalone mode, and the other copy or copies will normally run in master/slave mode. This type of configuration may be appropriate for large server farms that use one dedicated machine for monitoring and diagnostics

Here is a diagram that summarizes the possibilities:

Configuration types.

\addcontentsline{lof}{figure}{Configuration Types}\includegraphics{./main_configs.eps}

If you decide to set up one of these more complex configurations, see the Advanced Topics (see Advanced topics) section for details.

Apcupsd Known USB Issues

-Problem: USB is only supported on Linux and *BSD systems (though the *BSD is still BETA). Although the configuration script allows the usb

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