I have some hibernation questions, I hope someone can help me with:
1) Using hibernation with the UPS server:
I have a DS1010+ together with a DX510 and 10 Seagate ST2000DL003 drives in RAID 6 (DSM 3.2).
There is an APC Smart UPS 1500 (SU1500i) connected to the DiskStation via USB, powering both the NAS and a desktop PC.
I have the UPS server active on the NAS and WinNUT running as a server on the PC and polling the NAS UPS server for the status of the UPS every 10 seconds.
It seems, the polling of the UPS, prevents the NAS from hibernating. It will hibernate with WinNUT disabled, but as soon as I activate it, it stays permanently awake.
Is there a way to run the UPS server and still have the NAS hibernate?
Would it be better if I run a UPS server on the PC (NUT) and had the NAS check the status on that? Anyone tried that?
2) Hibernation vs Disk Sleep.
Even when the NAS is not hibernating, I notice that after a period of inactivity the disks stop spinning and when I try to access the volume, they take about 20 seconds to start up. They make an audible "whirring" noise when they do. My guess is that the Disks' firmware parks the head and stops the drive spinning when not in use, independently of hibernation.
My question here is, (a) is this as good as hibernation? Or does the fact that the rest of the system is fully on, mean that the cost is closer to idle utilization?
And (b) is there a risk to the disks similar to what happened with those early WD Green drives that were spinning up and spinning down all the time, limiting their lifetime?
Any advise will be appreciated. Thanks!
