Re: [PLUG] Going nuts with NUT

[Richard Freeman via plug <plug@lists.phillylinux.org>]

On 3/28/2025 12:20 PM, Gregory Deal via plug wrote:

I'm trying to have a UPS shutdown multiple computers (2 Macs and a NAS). Initially I thought "how do you connect a single UPS to multiple machines?". Some initial searching suggests using NUT (Network UPS Tools) to have the computer attached to the UPS direct the remaining ones to also shutdown.

    You are indeed on the right track.  It has been a while since I've
    touched it so I'll let somebody else comment on your exact config. 
    Some of the confusion comes from the fact that it has a couple of
    tiers.  It was basically engineered so that you can have any number
    of UPS units, and any number of devices using them, and rules to
    define when to shut down each individual device based on the status
    of various combination of UPS units.  (Ie consider you have 10 racks
    with 30 servers and two UPS units on each rack each feeding 1 of two
    independent PSUs on each server.  So that is 20 UPS units and 300
    servers.)
    
    Of course, most of the time we have 1 UPS and often just 1 computer,
    or maybe a little more.
    
    The main consideration I've seen is that you need to make sure the
    server that is doing all the message-passing (which need not be
    attached to a UPS) doesn't shut down until all the other computers
    have already started shutting down.  You also need to make sure that
    the UPS doesn't power off until all computers are down.
    
    For a single UPS config you typically put the UPS and the server on
    the same node, which has a longer shutdown delay than the other
    nodes.
    
    Also, it is beneficial to shed less essential loads sooner to extend
    UPS life for more essential loads.

--

Rich

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