APC UPS control system Shutdown Problems, Master/Slave Shutdown, Just after the line that reads

Configuration section of this manual for more information. See the EEP- ROM (see Configuring Your EEPROM) of this manual for further details on how to change these EPROM values.

Shutdown Problems

Obviously if your halt script is not properly modified, apcupsd will not be able to shut off the power to the UPS, and if the power returns before the batteries are exhausted your system will not automatically reboot. In any case, your machine should have been cleanly shut down.

Master/Slave Shutdown

In master/slave configurations, however, the master cannot be 100 percent sure that the slaves have all shutdown before it performs the power off. As a consequence, it is possible that the master will shut off the power before the slave has finished shutdown. If this is the case, the best procedure is to put an appropriate sleep command in the /etc/apcupsd/apccontrol file on the master. For example to give the slaves 30 additional seconds to shutdown, one would add:

sleep 30

just after the line that reads

doshutdown)

in the apccontrol file (approximately line 79 – depending on your system version).

Also, on a slave machine, you do not want to use the modified halt script since it will recall apcupsd, which will detect that it is a slave (i.e. no connection to the UPS) and will complain that it cannot do the killpower. This situation is not harmful just annoying and possibly confusing.

One possible problem during shutdown can be caused by remnants of old versions. Please be sure to delete or rename all prior versions (/usr/local/sbin/apcupsd or /sbin/powersc).

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