Forum Discussion

davidr1

Luminary

Jun 22, 2017

Solved

UPS and Power Chute and SNMP?

For tax reasons I need to purchase a UPS imminently - apart from the fact it is a very good idea to have one!

I use Linux (Ubuntu 16.04), Pro2, Ultra2 (both OS6) and 31400 NAS

I know nothing about SNMP and Power Chute. (I thought all UPS were SNMP?)

I can handle the pc end of things but need to know:

1. Can I 'just' connect one NAS to the UPS usb port and rely on the othe NAS machines getting the status from the router connection?
2. Is configuration required for permitted devices to connect to the first NAS so others can get the status they require?

3. Are all SOHO UPS' 'SNMP'?

4. Is Power Chute different from just a USB connection? I googled this - there ia lottle of technical info but not much that made sense to me re my questions.

5. Will the NAS only power down only when batteries are low or can I adjust how soon after a power failure to shut down the NAS? I see no point in keeping them going if the computers are off. I want to maximise the time the modem and router can stay on.

6. What happens if the NAS is doing something that takes a long time (like scrubbing or resyncing the array) and it is told to shut down?

7. Will the NAS stay off until manually started (desirable)?

A lot of questions I know but I have put off getting a UPS for too long. The more I read the more I get confused.

So thanks very much to anybody who can answer these question. Or tell me something that I have not asked but need to know. Once it was all so simple but things have changed ... :-)

Other Discussions

Performance

TeknoJnky
Jul 07, 2017
sounds like your UPS might have gotten fried.

Since you have 2 UPS, you could swap them and see if the other nas will recognize it.

If they both work on different nas, then perhaps something wonky with the config, but if the bad one still doesn't work, then I guess you need to replace it.

22 Replies

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StephenB
Guru - Experienced User
Jun 22, 2017
Most Home/SoHo UPS are monitored with USB - so you'd directly connect the USB cable to one of the NAS ports.

This monitoring uses a package called NUT (Network UPS Tools) - it isn't using SNMP. The NAS has NUT built in.

There's a list of UPS models that support NUT here: http://networkupstools.org/stable-hcl.html

APC models are popular. I use CyperPower myself. I've also seen some posters who use Eaton.
- hmuessig
  Luminary
  Jun 22, 2017
  So what happens if you have two units (314 and 716x in my case) with only one (the 716x) connected via USB to a UPS?
  
  Is there any way a second unit (the 314) can "know" when the UPS switched on? Network monitoring of the UPS is checked on the 716x . . .
  - StephenB
    Guru - Experienced User
    Jun 22, 2017
    hmuessig wrote:
    
    So what happens if you have two units (314 and 716x in my case) with only one (the 716x) connected via USB to a UPS?
    
    The RN314 can monitor the UPS using the 716x as a proxy. On the RN314 you specify "remote UPS".
    
    This uses the network connection, so you need to make sure the network path is also protected (ideally by the same UPS).
    
    I'm not sure what you mean by knowing when the UPS is switched on. The NAS knows that the UPS is functioning, whether it is using battery power or not, and the estimated run time. And it will execute a clean shutdown when the battery drain threshold is reached.