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ReadyNAS Power Management
HI all I have my NAS connnected to a APC UPS with a USB cable. The NAS has detected the UPS. My question is in the NAS menu, under system, shutdown, status, UPS configuration under 'Select sh...
HenryV wrote:
So do I understand that I need to use NUT software to accomplish this? How does it work? On PC's? What about my NAS? Of course its on the network. Does it recognize a signal from NUT??
You could use NUT, installing it on your PC.
There is another option. Some networked UPS equipment uses a protocol called SNMP to communicate power events. The ReadyNAS does support SNMP for selected models - there is a list here: http://kb.netgear.com/app/answers/detail/a_id/23121/~/how-do-i-add-a-ups-to-my-readynas-os-6-storage-system The UPS manufacturer should provide monitoring software for the PCs.
One way or another, you need to make sure the network stays up until the power events are communicated to everything that shuts itself down. One advantage of sotrack's strategy is that shutting down the servers immediately makes that fairly simple. The UPS would then keep the network up (router/switches/wifi) until the battery drains. In my case the network equipment uses quite a bit less power than the various ReadyNAS..
However, if you have a fair amount of equipment to protect (or if that equipment isn't all co-located) you will need more than one UPS anyway.
You can test one self:
1. charge battery 100%.
2. Put 90% under 'Select shutdown on battery low threshold'
3. Disconnect UPS from power supply
4. Wait shutdown or watch UPS status (until 80%)
5. Turn on NAS and check UPS status. If it is ~10% then 90% under 'Select shutdown on battery low threshold' mean used else left
My recollection is that "auto" causes the NAS to shut down then the UPS sends a power-critical event. So the threshold would be up to the UPS.
The threshold is the amount of power left in the UPS. The manual probably should say this (its a bit surprising that no one has asked this before).
sotrack wrote:
You can test one self...
Note if you have another load (a couple old incandescent light bulbs perhaps) you can also test it with the UPS connected to the load, but the NAS connected to the main power. You do need to connect the USB to the NAS of course.
Then the NAS won't actually lose power, but should still respond to the power events.
StephenB wrote:
My recollection is that "auto" causes the NAS to shut down then the UPS sends a power-critical event. So the threshold would be up to the UPS.UPS does not send power-critical event. It send percentage of battery power. NAS check threshold parameter and get shutdown decision. "Auto" is predefined threshold parameter I think 50%.
sotrack wrote:
UPS does not send power-critical event. It send percentage of battery power. NAS check threshold parameter and get shutdown decision. "Auto" is predefined threshold parameter I think 50%.
I've had power failures that used more than that, and my NAS didn't shut down.
It appears to be more complicated than simply sending a percentage of battery power (based on reading through the material here: http://networkupstools.org/docs/user-manual.chunked/ar01s06.html )
Here are the steps that occur when a critical power event happens:
- The UPS goes on battery
- The UPS reaches low battery (a "critical" UPS)...
The exact behavior depends on the specific device, and is related to:
- battery.charge and battery.charge.low
- battery.runtime and battery.runtime.low...
...
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