Hey guys! Since i tok the step to move out from the nimbustor AS5402T to a Lenovo Thinkstation P3 Tiny for my homelab i realized that storage was a bit of a hard nut to crack in this one.

So the initial plan was to add the LSI 9400-8i to the Lenovo Thinkstation P3 Tiny with a riser cable out of the enclosure so i can make sure to create some diy cooling on this board, i suspect it gets rather hot.
And then basically just 3D print a JBOD enclosure in the KWS 10'' Rack V2.

But for power i had to settle for an external PSU for the HDD's and here is my foreseen issue, common ground.

The arcithecture is looking like this:

Lenovo power brick --> P3 Tiny --> LSI 9400-8i --> SATA to HDD

Corsair Rme 750w ATX PSU with jumper pin --> Power to HDD

if i'm, not mistaken, shouldn't Corsair PSU and Lenovo share common ground in this scenario? ( should probably also change out the corsair to a meanwell.)
And if they are supposed to be grounded, any tip on how other's have solved it?

Edited June 1Jun 1 by Krisyv3

Switching power supply usually are common AC earth and the DC ground. But P3 Tiny use external power supply, this type PS may not in same condition.

SATA/SAS are differential signal, there are argument should ground for both-end ..... below post have point out a good example, will you ground all equipment if they are connect with ethernet cable ? But I would say ethernet case have some different, because there are a small transformer inside the ethernet port.

https://www.edaboard.com/threads/differential-signaling-and-ground-referencing.307250/

BTW, personally I will add extra ground wire to both end's DC ground.

Edited June 2Jun 2 by Vr2Io