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Forum Discussion
UPS recommendations for RN31600 and a server with iSCSI?
HI All, I'm looking to purchase a RN31600 and I plan to either connect to it with an iSCSI LUN in Win Server 2012 or with VMWare ESXi. Ideally, I'd like to put both of them on the same UPS. T...
I think the tricky part here is dropping the iSCSI connection before the NAS shutdown.
I guess you could set up the server to shut down at a higher threshold, so it shuts down first. But that might not be bulletproof.
A crude (but more expensive) approach might be to daisy-chain two UPS (connecting UPS B to a protected output on UPS A). Then have the server monitor UPS A, and the NAS monitor UPS B. "B" can be smaller than "A", since its only purpose is to give the NAS a bit more running time.
Daisy chaining them is typically frowned upon, from what I've read. I suppose waiting for UPS A to die off before UPS B goes into power protection and shuts down the NAS would work because it will ensure that the server is off (hopefully from the shutdown command) before the NAS initiates the shutdown on B.
I know it's easier said than done, but I was hoping there would be something where the server broadcast "I'm shutting down" and the NAS would monitor for the iSCSI to disconnect and then shut down itself. I'm aware that I am overthinking it when there is a generator on site, but I'd just like to eliminate as many chances for corruption as possible.
Does the server have one PSU or two?
btandf wrote:
I know it's easier said than done, but I was hoping there would be something where the server broadcast "I'm shutting down" and the NAS would monitor for the iSCSI to disconnect and then shut down itself. I'm aware that I am overthinking it when there is a generator on site, but I'd just like to eliminate as many chances for corruption as possible.
I think you write a small app on the server that could do something like this.
This thread shows how to command the NAS to shutdown remotely: https://community.netgear.com/t5/Using-your-ReadyNAS/Remote-shutdown-on-OS-6/td-p/846137
So if you have a shutdown script for the server, you could send a shutdown command to the NAS after iscsi is disconnected.
Thanks. I'll have to find the right event to monitor, if it's even available, and then hope that there is enough time remaining in the shutdown process to fire the NAS shutdown command.
I'll be honest, I'm surprised many haven't asked about this more often. To further my wishful thinking, it would be even more reliable for a script on the NAS to monitor the power state and iSCSI connections. If on UPS power and iSCSI sessions disconnected, then shut down.
If I can find the right event in Server 2012 I'll use it to initiate the curl script. If not, I'll just change my thresholds for UPS shutdowns to it will give me the best fighting chance for graceful disconnect and shutdown.
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