Rockpro64 with sata pcie card and omv
(05-03-2018, 04:51 PM)chrisf Wrote:
(04-29-2018, 11:35 AM)hopkinskong Wrote: No, I didn't measure the power consumption. I was relying the current draw information printed on the hard disk label. It says how many Amps it will drawn from the +12V rail and +5V rail. for a 120W (12V 10A) power brick, minus 3A for RockPro64, there is 7A left for your hard drive and peripherals. Running 3-4 drives shouldn't be a problem. If not all of them will be running at full seek and spin, you may even add more hard drives.

Regarding the 5V rail, of course you can run multiple LM2596S-5.0 on multiple drives, just make sure you don't short out the 5V rails (GND of course need to be common). I would say powering 2 3.5' HDD per LM2596S-5.0 is pretty safe. Or you can always grab a better IC to provide higher current for your 5V rail.

Unless you can guarantee staggered spin up, not only when first powering up but also when the drives resume from sleep, you should allow at least 30W per 3.5" drive. Hard drives consume a lot more power than the numbers printed on them when spinning up the platters.
A quick google shows it's typical for a 3.5" 7200 rpm drive to consume 700mA on the 5V rail and peaks of 2.5A on the 12V rail during spin up. The last thing you want to happen is for your PSU to go in to current limit protection and shut down.
I wouldn't run 4 drives on a 120W PSU without first testing how much the drives consume.

1. You can use hdparm  to configure SSU
2. Peak current still depends on the drives. WD Green drives only peak at 1.75A according to the official datasheet. 1.5TB drivers only peak at 1.00A. (But who still uses 1.5TB drives for NAS nowadays Cool)
3. Maybe you can put a high capacitance capacitor on the 12V rail per HDD?
So just some wall power numbers here I have taken with my current PC (Fx-8350, R7 260x, 1x SSD, 8x HDD).

As a baseline, system in idle with all monitors switched off and all harddrives spun down is 90W wall power.
Spinning up the hard drives with staggered spinup adds roughly 20-30W during the spin up and roughly 7W per drive which has spun up (which really does not match what is printed on the hard drives). This is without transferring data though.

My plan is to basically outsource the 8x hard drives from my main computer to a dedicated nas which most of the time will be idle (so good idle power + stager down + maybe wake on lan would be good). So I obviously do not want more energy than my system is consuming at the moment.

While I know that it is always good to have spare room in the energy consumption department, if you run a 500W power supply only consuming 20W most of the time means you are running the power supply in a energy range it s not design to have good efficiency. On the other hand, many low power power supplies do not have good efficiencies to start with. So still really torn what to do.

At the moment, I think the easiest solution would be to have two of these:
That would give me 140W peak but I am not sure how efficient these things actually are...
Alternatively, one could get the smallest be quiet ATX power supply which is like 300Ws and hopefully also has good efficiency at 20W-50W in idle...
Considering the expansive price on 88SE9230 or other 4-port SATA expansion card, has anyone been considering to use J3455M PC platform plus 2-port pcie-sata card for building 4 bay NAS? I am guessing the price may be close to each other, more of less, but PC has better support on software and support VM better, also J3455 is also very power efficient.

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