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Forum Discussion
Shutdown rules on ReadyNas Duo V2 (arm) with connected APC SmartUPS in power breakdown situation
Hello!
I have a ReadyNAS Duo V2 (arm) with firmware 5.3.13. The NAS is connected via a AP9630 network management card 2 to a APC SmartUPS. In the AP9630 the ReadyNAS Duo V2 is configured as snmp trap receiver. The APC SmartUPS is configured correctly in the ReadyNAS Duo V2 and is visible there.
My question is: what rules will the ReadyNAS Duo V2 follow if there is power breakdown and the UPS support the ReadyNAS with power?
in detail:
- what information is used by the firmware of the ReadyNAS to decide to shutdown? Remaining runtime in minutes or remaining capacity in % of the batteries of the UPS? Or something else?
- when is the shutdown process initiated? At once or later after reaching a threshold value?
- what trap snmp information is sent from the AP9630 to the ReadyNAS Duo V2?
- how is the trap snmp information exploited?
- how should be the AP9630 configured to give the ReadyNAS Duo V2 enough time for a clean shutdown?
- can be something configured on the AP9630 network management card to support the ReadyNAS Duo V2? I ask this because batteries went more worse with time and the load at the UPS may change in a power breakdown situation because all devices connected to the UPS need more power to shutdown or react in other way on the power breakdown. And so the load can change to normal/default situation and this will have an impact on the load and so on the remaining runtime of the batteries.
I hope that someone can tell me some more information about the procedure of shutting down due to power breakdown and connected APC UPS. It should be clear how a shutdown is done because a NAS should protect data and for this a clean shutdown is very important too! Not only other backup strategies to other NASs because an unclean shutdown may lead to a huge effort to check the consistency of the data of the unclean shutdowned NAS.
Thanks!
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The NAS doesn't need long to shutdown (less than a minute).
You can easily do a test to verify things are working properly. Plug power of the NAS directly into the wall outlet, but connect the SNMP to the UPS. Unplug the power from the UPS and monitor to see when the NAS is shutdown.Then reconnect the UPS to power and plug the power cable from the NAS into the UPS again.
Hi!
I did the test before und now again with pictures
As you can see the UPS and the NAS are running for 30 minutes without any reaction in a power breakdown situation because the batteries of the UPS are nearly full. For the note I sent alert messages 17.55 and 18.25 which can be seen on the pictures. Then I interrupted the test because I do not want to empty my UPS.
Because of no load at the UPS this test can take a long time until the remaining runtime is low enough or the battery capacity falls under a certain treshold or ... so that the NAS get a signal from the AP9630 in the UPS to shut down.
That is why I ask the above questions: on what information or signal and when will the NAS shutdown?
Well, the information is clearly coming through the SNMP MiB defined by APC. You'd have to look at that to see what is sent.
You could also perform your test safely by
- connecting the NAS to the main power (instead of the APC)
- Put a load on the APC
- Disconnect the APC from main power.
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