In a stand-alone NUT configuration the FSD flag would shutdown the machine.When timer fires or when UPS reports Low Battery, the upsmon raises the FSD (forced shutdown) flag to upsd.(optional, useful if you want to shutdown in few minutes instead of Low Battery) upsmon on the VM initiates upssched 5 minutes timer.UPS via usbhid-ups reports to upsd about power failure.On power failure the following sequence takes place: ESXi host is running the 2nd instance of upsmon which also connects to the same VM upsd via internal network. The upsmon master process running on the same machine connects to the upsd and initiates the shutdown. The upsd process connects to the UPS through the usbhid-ups driver and monitors the UPS state. VM is running the UPS driver usbhid-ups which is responsible for the communication with UPS via USB. NUT (Network UPS Tools) master running in the VM, and native ESXi NUT slave running on the ESXi host. UPS is connected to this VM using ESXi USB pass through option. A Linux virtual machine running on this ESXi host. Here are details of my similar setup.ĪPC Smart-UPS 1500 connected to the ESXi 5.1 Host via USB.
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