I have an apc 1500 ups that I have both my synology and unraid server plugged into. The usb/ethernet connection from the ups is to my synology and synology acts as the server. I have already connected unraid to my synology ups server and verified within unraid that it does see it and I can view all the information regarding my ups within unraid.

 

I am having an issue where when there is a power outage and unraid shuts down after the set period of time I specified, when I boot unraid back up it shuts back down because it receives some type of flag from synology to shut down again. I have to disable the synology ups server then restart unraid for it to turn on.

 

Is this expected behavior or have I configured something incorrectly?

After power outage, the battery need charge up again, you need further check does battery / runtime still under triggering setting.

 

It also a case, when you boot up Unraid, it will draw max power, then runtime will drop significant before completely boot up.

Edited October 29, 20241 yr by Vr2Io

The battery it fine, I don’t ever let it drain. I set unraid to shut down after 2 minutes of no power so it’s not a battery issue. From watch idrac on my server when it attempts to boot I recall seeing an entry right before the server shuts down about receiving a power down signal from synology even when power had been restored. 

When UPS at mains, even low battery it wouldn't flag other to shutdown, I correct this first.

 

Could you confirm does Synology correctly indicate Unraid, UPS in On-line instead orher states.

Edited October 29, 20241 yr by Vr2Io

I added the unraid up to my synology devices in the ups section and have the setting applied below. Here is an image in unraid showing that it does see my synology ups and can read the information from the ups. So they are definitely linked. 

It’s just for some reason after unraid initially shuts down when it’s supposed to during a power outage, it’s like synology is continuing to send a shutdown signal to unraid that persists indefinitely until I shut off the synology ups server. When I shut down the ups server on synology then unraid can reboot and I can turn back on the ups server. 

Problem likely once Synology enter standby mode when UPS on battery timer reach, as below post said you need reboot Synology ( to exit standby mode ), then reboot Unraid.

 

Suggest solution are don't use Synology be NUT server or use other platform / device as NUT server.

Or you can swap Unriad be NUT master and Synology as client, but if that, Synology must react before Unraid shutdown.

 

Or very simple, restart Synology first.

 

https://community.synology.com/enu/forum/1/post/188928

Edited October 30, 20241 yr by Vr2Io