NVDimm support on AMD Epyc

RageBone

Active Member
Jul 11, 2017
443
111
43
two possible issues between powergems.
Pinout of the cable / connectors.
And the Controller used in the Powergem.

I suspect that they have i2c wired up so that the NVDIMM can get telemetry from the Gem.
Through that, it could check for a specific controller used.

Datasheets for a a LTC3350:
Technically its the wrong manufacturer since the logo on the chip shown in the pictures refers to Linear Technology (LT) and not Analog Devices

@nasbdh9 you could do as a favor in grabbing a multimeter and measuring the pinout of the powergem connector going to the NVDIMM.
 

nasbdh9

Member
Aug 4, 2019
85
24
8
two possible issues between powergems.
Pinout of the cable / connectors.
And the Controller used in the Powergem.

I suspect that they have i2c wired up so that the NVDIMM can get telemetry from the Gem.
Through that, it could check for a specific controller used.

Datasheets for a a LTC3350:
Technically its the wrong manufacturer since the logo on the chip shown in the pictures refers to Linear Technology (LT) and not Analog Devices

@nasbdh9 you could do as a favor in grabbing a multimeter and measuring the pinout of the powergem connector going to the NVDIMM.
Sorry, I have sold all these boxes :oops:
 

Propaganda

Member
Dec 6, 2017
98
23
8
41
two possible issues between powergems.
Pinout of the cable / connectors.
And the Controller used in the Powergem.

I suspect that they have i2c wired up so that the NVDIMM can get telemetry from the Gem.
Through that, it could check for a specific controller used.

Datasheets for a a LTC3350:
Technically its the wrong manufacturer since the logo on the chip shown in the pictures refers to Linear Technology (LT) and not Analog Devices

@nasbdh9 you could do as a favor in grabbing a multimeter and measuring the pinout of the powergem connector going to the NVDIMM.
Analog Devices bought Linear Technology a few years ago.
 
  • Like
Reactions: RageBone

edgecase

New Member
Nov 4, 2021
1
0
1
I wonder, are any of these safe to use in production environments, while waiting for CXL products to hit the market? I'm not a fan of HPE's storage cost, but I would trust their NVIDMM implementation, and possibly Dell. If I buy a Tyan TS75-B8252 and some NVDIMMs and PowerGems, even if they are new-in-box, is there any vendor support? I wonder if there is a way I could test them to be confident they are reliable?
 

Rand__

Well-Known Member
Mar 6, 2014
5,653
1,248
113
Of course you can test them, its ram + battery.
Mount as drive, write to it, power down box, remove any trace of power, power back up. Everything should still be there.

I doubt you get vendor support from HPE/Dell unless the system they were sold with is still under warranty, and basically no chance for any support on 3rd party.
I know Supermicro is not helping much (no market for them), but Micron was helpful, but not sure if that's the official stance or if i was lucky