Unlisted9035

Thanks mgutt - I suspected as much given the enterprise nature of SAS drives and HBA cards. I idle at about 49w with the drives spun down so it's not too bad. I think my plan will be to migrate towards SATA as I upgrade and aim to do away with the HBA. Another interesting data point if anybody is interested - I had two Silicone Power 512GB SATA SSD drives as a cache pool, and they prevented the system from moving to anything but C1. Is there a user-compiled resource anywhere where people can list specific hardware and the apparent C-state limits that they have?

So I'm on a bit of a power efficiency binge at the moment and I'm trying to get my unraid server to hit the highest C state that I can. I've narrowed down one of the culprits as the HBA. It's an HP H220 aka LSI 9207-8i / 2308 HBA flashed with the latest P20 firmware. I'm using it to control 4 x 6tb SAS drives. Per powertop, without the card plugged in the system can go straight to C8 which is just fine by me. When the card is plugged in, the lowest power state it will get to is C2 (including w/ drives spun down). So I guess my question is: Is anybody out there running a PCIe HBA card and able to achieve a lower power C State than C2? unraid-diagnostics-20230521-1325.zip

Thanks Lolight - Will try there too. 🙂

I'm having a bit of a power efficiency binge at the moment and I'm trying to get my unraid server to hit the highest C state that I can. I've narrowed down one of the culprits to the HBA. It's an HP H220 aka LSI 9207-8i / 2308 HBA flashed with the latest P20 firmware. I'm using it to control 4 x 6tb SAS drives. Without the card plugged in the system can go straight to C8. When the card is plugged in, the lowest power state it will get to is C2 (including w/ drives spun down). So the question is: Is anybody out there running a PCIe HBA card and able to achieve a lower power C State than C2?