PSU for 13+ HDDs - home nas

[Dariusz]

Hey

 

I was lately wondering if my newly put together nas is going to explode...

 

I have 5x WD red pro 6TB and 8x WD red hdds 10TB , According to their spec they will draw max 90W, my PSU >

Corsair CP-9020102-UK CX550M 550 W 80+

https://www.amazon.co.uk/gp/product/B01C3FFLZ8/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

https://www.corsair.com/uk/en/Categories/Products/Power-Supply-Units/cxm-series-2015-config/p/CP-9020102-UK#tab-downloads

Has 120W on 5v rail... but I wonder.. I have split the hdds between the 2 sata/periperia ports, 6 on one and 7 on other... 

 

Any ideas any1 ? 

 

Regards

Dariusz

 

[Dariusz]

Yeah thats my hope too, but I wonder if the 5v also goes to motherboard/other components? Not sure... 

[Windows7ge]

Once they're up to speed a 550W would me more than enough.

 

Where you should be concerned is the initial spin-up. They will draw significantly more amps and could cause the PSU to trip over-current protection if it doesn't have enough or even melt wires if you go out of spec of the cables.

 

Staggered Spin-up which is a common feature on server equipment helps this by not letting the disks start spinning all at once. You could buy an HBA that supports this feature or you can pick a PSU that can handle the sudden draw for power.

 

Did you say you located the datasheets? What did it say the spin-up current draw is (in Amps) for both 5V & 12V rails?

[OrionFOTL]

Make sure to enable a feature called staggered spinup (I don't know where, BIOS I suppose), so the hard drives don't all start up simultaneously.

[Windows7ge]

Just now, OrionFOTL said:

Make sure to enable a feature called staggered spinup (I don't know where, BIOS I suppose), so the hard drives don't all start up simultaneously.

If he's using a consumer motherboard and no HBA/RAID card there's a good chance it won't support this.

[Dariusz]

I'm using

Supermicro Micro ATX DDR4 LGA 1151 Motherboards X11SSM-F-O

and

LSI SAS 9207-8i KIT 8-Port 6Gbps SATA+SAS PCI-E 3.0 HBA Kit

 

So far its been running for 1h while I stare at freenas config and keep deciding between raidZ2 and raidZ3. The 15 of usable space I have in 1st pool will be mirrored to second 40 or 50tb pool for secondary backup. Still 1 case tho so if something explodes all die, but in other cases I'm protecting data.