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Forum Discussion
NAS Disk Test - 3rd test extremely slow.
Having conducted 2 tests previously taking about 3 hrs 15 mins (See http://www.readynas.com/forum/viewtopic.php?f=11&t=79874), I was slightly perturbed to find the test started last night has only jus...
Well, as far as I can tell there are basically four things people want to accomplish with spindown.
(a) some people just want the NAS to be quiet, particularly off-hours. Perhaps they live in a studio apartment ...
(b) some people want to minimize their power use. They might be wanting to minimize their carbon footprint, or they might have severe power constraints (at least one NAS owner lives on a boat).
(c) some people want lowest cost of ownership. So they would want a crossover point that minimizes (power cost + disk replacement cost)
(d) some people want to maximize disk life. That group includes you.
I don't know of any study of reasonably modern drives that would give you a solid engineering answer to your crossover question. There was a paper published in 2010 (https://www.cs.kent.ac.uk/pubs/2011/3237/content.pdf) that cites an 1994 study that concluded "Each power state transition provides the same wear as 3.75 hours of continual operation."
That is exactly the kind of statement you need; I just don't believe its the right number for your drives - and I haven't seen any statement like that in a more recent study. WD40EFRX drives are mechanically very different from the drives that were on the market in 1994. One key difference is the bearings - fluid bearings are used today, but weren't in use back then.
My instincts are telling me that a spin down/spin up cycle is about the same as 1 hour of operation. That's why I'd leave spindown running using your settings. But that crossover point is based on my intuition, not any data - and I am not a hardware/mechanical engineer. I am a software/systems guy by training.
(a) some people just want the NAS to be quiet, particularly off-hours. Perhaps they live in a studio apartment ...
(b) some people want to minimize their power use. They might be wanting to minimize their carbon footprint, or they might have severe power constraints (at least one NAS owner lives on a boat).
(c) some people want lowest cost of ownership. So they would want a crossover point that minimizes (power cost + disk replacement cost)
(d) some people want to maximize disk life. That group includes you.
I don't know of any study of reasonably modern drives that would give you a solid engineering answer to your crossover question. There was a paper published in 2010 (https://www.cs.kent.ac.uk/pubs/2011/3237/content.pdf) that cites an 1994 study that concluded "Each power state transition provides the same wear as 3.75 hours of continual operation."
That is exactly the kind of statement you need; I just don't believe its the right number for your drives - and I haven't seen any statement like that in a more recent study. WD40EFRX drives are mechanically very different from the drives that were on the market in 1994. One key difference is the bearings - fluid bearings are used today, but weren't in use back then.
My instincts are telling me that a spin down/spin up cycle is about the same as 1 hour of operation. That's why I'd leave spindown running using your settings. But that crossover point is based on my intuition, not any data - and I am not a hardware/mechanical engineer. I am a software/systems guy by training.
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