The UPS is a serverrack UPS and only has power and a network connection, which is used to communicated with the other devices on the network. No USB available.
Its not completly the same as the document. mine is a SMX2200HV
The manual does look to show a usb, not sure why I never seen it. I will have another look on the UPS. 🙂
Question:
1. why would I connect the NAS with the UPS using USB cable? Does this not defeat the purpose of the network monitoring option?
2 If all would have worked correctly without using a USB cable, what would be the value on which the NAS should switch off when using the network monitor option? Low battery? Any idea?
1. why would I connect the NAS with the UPS using USB cable? Does this not defeat the purpose of the network monitoring option?
The idea is that you switch away from SNMP, and try using that alternate monitoring tool. If that works, it would give you a clean shutdown if the power were to fail.
In any event, as far as the NAS is concerned, there is no particular advantage I am aware of with SNMP over USB.
But I'm not sure that SNMP isn't working properly (see below)
One thing you could do to test your monitoring (either SNMP or UPS) is to connect the equipment to the main power temporarily, and then connect a test load onto the UPS (a fan, or anything that uses a fair amount of power). Then disconnect the UPS from the main power, and wait for it to completely drain. You can then confirm that everything shuts down cleanly.
The only real advantage of using SNMP over USB is when you have multiple devices attached to the NAS and either can't or don't want to use one as the "master" and others as a slave. Most still let you use USB for one device while others use SNMP.
I have an Eaton rack-mount UPS in the rack with my primary NAS (RD5200, converted to OS6) and two backups (RN4200V2, converted to OS6) and everything works. But there is also a switch in the rack that's protected by the UPS, to insure the shut-down command makes it to all devices.
If you have multiple device groups (sections of outlets) on that UPS, make sure the NAS are connected to one that shuts down when the main (last) one does. So either they are on the main group, or there is no delay between groups. At least on my Eaton, I have found no way to use simple SNMP signalling and NUT on the NAS to set up the NAS in any other group. I have to use Eaton's IPP software for that.
Note that I said my RN4200V2's are converted to OS6. You can do that as well. It does require that you back-up all the data, do the conversion, then restore it; but I think you'll find it a huge improvement unless you do need to retain the capability of engaging Netgear support, as that is denied on legacy units that have been converted. Support is available from the forum, of course.
The only real advantage of using SNMP over USB is when you have multiple devices attached to the NAS and either can't or don't want to use one as the "master"
I think you must be thinking about using NUT's remote monitoring with other devices (not multiple devices attached to the NAS).
I agree SNMP is better in that case - one reason is that all the devices will get the notifications even if the USB-connected device has failed is otherwise shut down.
But if the USB port in the APC is unused, it could easily be connected to the NAS, while the other devices use SNMP. That of course assumes that the SNMP issue is a bug in the NAS, and not something else.
