Is there any documentation on how this is done with regard to UPS's attached to unRAID guest VMs?
i'm connected my APC unit to Windows VM, but this is similar to unRAID i think.
first, i'm telneting to unRAID and power it down with sbin/powerdown
then wait some time (1minute for me) and ssh to esxi host and excute "/sbin/shutdown.sh && /sbin/poweroff"
look at unRAID /etc/apcupsd/doshutdown
you can ssh from here to esxi host and execute command above..
if you have VMWare tools installed on unRAID, esxi will do clean shutdown i think.. (not tried yet..)
I do have VMWare tools installed. I'll have to look into doing this when I get my new UPS next week.