SC846 power dead, what are my options?

[Stefan75]

Been using my SC846 for a few years.
No motherboard, shorted ATX pin.
PWS-902-1R
PDB-PT846-N24

After a while it seemed that if I turned the case off and on again soon, it didn't start every time.
Now it doesn't start at all.

Took out the two PWS and the PDB for testing.
The PWS go to yellow, but ATX short does nothing.. my guess is the PDB is dead.

Ebay show these and the newer PDB for $150 !! might work and fail again, no thanks.

a) anyone have a cheap/spare PDB-PT846-N24 for me in EU?

b) has anyone been able to use 1 or 2 "normal" ATX PSU with 24 disks?
I tried with two old 500W PS, everthing (disk and fans) started up... wow.
But when there was load (raid 0 with 24disks) the backplane turned off with red lights.

c) what about using the cheap HP PSU with a disk mining board?
$55 plus shipping and the cables are SATA = 6+ molex adapters carrying high amp.. NO

d) should I look for a 12V to 5V converter (1 PWS and soldering)?
How many 5V amps needed 24 disk?

e) ?

 

[CyklonDX]

b) Yes. I am currently running 24x 3.5" sas disks with single decent 500W PSU.
(Running a jbod with CSE-PTJBOD-CB2 controller)

https://www.amazon.com/gp/product/B0817DXRPX/

Red light indicates overheat fail

 

[Stefan75]

Only one 500W?? What model is that?
24 disk spinup needs >50A on 12V.. that alone is more than 500W.
Are you doing staggered spinup somehow?
In this thread: 1000W PS not enough, red lights = power shortage

 

[i386]

SC846BE1C-R609JBOD | 4U | Chassis | Products | Supermicro

846BE1C-R609JBOD

www.supermicro.com

600/650Watt psu

 

[CyklonDX]

Only one 500W?? What model is that?
24 disk spinup needs >50A on 12V.. that alone is more than 500W.
Are you doing staggered spinup somehow?
In this thread: 1000W PS not enough, red lights = power shortage

According to my UPS the system isn't taking more than 416W at full speed fans (without fans 360W)
I did replace the fans with noctua ones ~ sc fans could be ~100-150W

 

[mattventura]

There's a difference between a good 500W PSU and a crap 500W PSU.

I had the same issue where I was trying to run a mere 8-bay SAS JBOD off of a crap 300W PSU and even under low-load conditions (i.e. after spinup, just normal drive usage), drives would still randomly reset. 300W gives you almost 40W per drive which should be more than enough especially after the initial spinup. Replaced it with an enterprise-grade PSU and the problems went away completely.

I've found that despite being generally more reliable, enterprise-grade drives tend to be more picky about power.

 

[Stefan75]

KB450059 - Start up Power Draw - 45Drives Knowledge Base

You are here: KB Home 45Drives Hardware KB450059 – Start up Power Draw Table of Contents Scope/DescriptionStartup Power DrawDC Power Draw 15 HDDs (Total 5V & 12V lines) Scope/Description This article describes the results of the power draw of Storinator. See the following links for more detailed...

knowledgebase.45drives.com

If all 24 disks start at the same time, I expect >700W for about 5s.
Maybe good PSU can deliver more that specifiied for some time.

 

[CyklonDX]

i don't know how they tested, and with what kind of disks,
Constellations ES.3 they named has no max wattage specified in pdf
(but i do recall those disks were blowing off their fuse)

but

In disks specifications you can find their max operating wattage power draw.
Which is on avg around 10W per unit for 12Gb/s SAS 16+TB disks at max operating wattage.

The disks won't use more than typically +1-2W, and have fuse on them, over wattage protection.

 

[Stefan75]

Tried a Thermaltake 700W PS this time (three non-modular power cables with a total of five 4pin connectors). Only 15-17 disk could spin up
My guess is, the wires are much too thin (outer 1.75 and 2mm) for this amount of power. The PDB cables are thicker (outer 2.5mm) and much shorter.
I think I have to give up using ATX PS

 

[CyklonDX]

try disconnecting sc fans, and see if that makes difference.