Hi everyone,
So I’ve purchased an HP DL360p Gen8 server with 4 x LFF drive bays which I’m fairly happy with, however I wanna expand it on the cheap and when I mean cheap I’m talking about 150 bucks to add 16 x LFF bays
And one of the main motivations for this is power consumption, all other options I found use their own power supply and were expensive.
Side note after writing the topic, I had many pictures but as new user it didn’t allow me to use them
To achive this what I’ve decided to do was to purchase the following:
- HPE 24 Bay 3Gb SAS Expander Card (Part nr 468406-B21 or 487738-001). Note: This works, I’ve been using it even though some people say otherwise.
- HP DL380E 8 Bay LFF Backplane (643704-001)
- Some extra suff such as SAS cables, etc.
My problem now comes to power the dam 8 Bay Backplane from the server itself, without using any external power supply.
What I plan is to get power from the 10 pin power cable inside the DL360p Gen8, that feeds the backplane. Cutting and soldering or most likely replacing one of the plugs is expected.
10 pin connector: 4 LFF backplane
When I saw that all top pins are yellow and all bottom ones black, I assumed it would be 12v all of them, well I was wrong, I grabbed my multimeter and measured it.
Please note that the pin nr starts at top left, looking at the cable plug with the lock pin on the top, couting 1 to 5 on first row and 6 to 10 on the bottom row.
I’ve placed the COM of the multimeter on a bottom pin and measured the top pins. If this doesn’t make any sense, please help me on how to do it properly.
- -12.2 v
- -8.9 v
- -7.18 v
- -12.2 v
- -7.18 v
- COM
- COM
- -5 v
- -1.7 v
- 0 v
- -5 v
- 0 v
- COM
- 0 v
- 0 v
- 0 v
- 0 v
- 0 v
- COM
- 0 v
- 3.29 v
- 5 v
- 0 v
- 5 v
- COM
Something I though it was strange was having most of the voltages inverted, only the last one gave positive values.
After this I kinda learned that cable color seems to mean nothing to HP.
Then I decided to check for conductivity on the 4 LFF backplane connector, this problably is dumb to do but felt to help me on the 8 LFF backplane as I will show next.
The following is the conductivity findings on the 4 LFF backplane power connector, the letters represent matching pins that would make the multimeter beap.
- D
- A
- D
- F
- A
- A
- B
- C
- D
- B
My analises from this is that is most likely condensers and other components on the board can affect this I feel.
Also it’s strange that letter F had no match, however looking at the board it seems to have traces that go to the side, to a small connector.
And nr C did some times beap very shortly with the right 2 pins nr 5 and 10.
8 pin connector: 8 LFF backplane
I’ve tried to ask this info on HPE forum where they provided incorrect information and essentially asked me for a support contract.
The first thing I noticed was that this backplane uses a 8 pin connector instead of the 10 pin found in my server, so I needed to figure out what is are the voltage pinout for it.
I found this picture that helped me a great deal:
https:// imgur . com/a/FW4pTcU (remove spaces, I felt this one is important for context)
With the picture and testing conductivity on the connector itself, I found this pinout voltage assumming that the colors match normal ATX standard:
- GND
- GND
- 12 V
- GND
- 12 V
- 5 V
- 12 V
On the board itself, the bottom left pin doesn’t seem to be used.
This results look promising, but I don’t have a confirmation on it yet
Conclusion:
When I found out the voltages for the 8 pin connector on the 8 bay LFF backplane left me more motivated to continue with this, but after checking the server itself and finding that it’s all over the place I don’t know anymore
I come here to you guys, looking for some help, maybe some of you has access to some HP resources with this information.
Or help me kinda reverse engineer this thing.
Thanks,
Ralms.