New Installation - Very Slow Initial Parity Sync Speeds

[ajguerre]

Hi guys,

 

I just finished doing a new installation and I'm getting extremely slow parity sync speeds (~2.0MB/s). Attached please find the diagnostics files. Any help is greatly appreciated it.

 

Best regards.

server-diagnostics-20211220-0202.zip

[JorgeB]

Nothing obvious in the diags, try the diskspeed docker to see if all disks are performing normally.

[ajguerre]

thanks @JorgeB

 

I ran diskspeed and it all looks perfect:

 

Still, when I try to do a new installation the parity sync is extremely slow:

 

I'm at a lost here. I did a full clean installation of unRAID and still the same slow parity sync speeds.

 

Any clues are extremely appreciated!

Edited December 22, 2021 by ajguerre

[JorgeB]

3 hours ago, ajguerre said:

I'm at a lost here.

Same.

 

Server load is high for what it's doing.

[ajguerre]

Hi @JorgeB

 

After countless hours of troubleshooting, I found the culprit! I have a Ryzen Threadripper 3990X and I read somewhere that the "Global C-States Control" setting in the BIOS should be disabled. Well, that is WRONG. If I disable it, then I get extremely slow parity sync speeds (2-4 MB/s!!!!). If I enable the "Global C-States Control" setting in the BIOS, then I go back to my usual parity sync speed of 280 MB/s!!!

 

I think this should be tested and published somewhere for anyone else having this issue!

 

Happy holidays!

[JorgeB]

That's strange, disabling C-States is expected to increase power usage, but it shouldn't degrade performance, likely a BIOS issue, though you don't need to disable C-States, just enable the correct power supply idle control setting:

 

https://forums.unraid.net/topic/46802-faq-for-unraid-v6/?do=findComment&comment=819173