[SOLVED] Unraid 6.6.1 - ata6.00: failed command: WRITE FPDMA QUEUED

[guyonphone]

Hello, 

My Cache Drive is showing an exclamation mark on it, the value "UDMA CRC error count" has increasingly gone up. This was happening to the previous drive, and I upgraded it from a 500 Gig SSD to a 1 TB SSD and the issue is still occurring. I have done some research and the result of the research is people saying that the SATA cable is bad. I use a Norcotek case and use 4 SAS 8087 cables from my LSI card to my backplane, and 2 reverse breakout cables from my 8 onboard sata ports to my backplane. I suspect that one of the reverse breakout cables may be bad, and have ordered 2 new ones. However I am posting here just in case anyone has any better ideas. 

 

unraid-diagnostics-20181013-2043.zip

Edited October 25, 2018 by guyonphone

[JorgeB]

It's usually the SATA cable, backplane is also a less likely possibility.

[guyonphone]

My reverse breakout cables came, I swapped them out, I am still getting the error but on a different port ata3 (now) vs ata6 (before), so this says to me the issue is probably my backplane, as I know I did not plug the new breakout cables in exactly the same ports as the previous. I've ordered a new backplane, hopefully that will resolve my issue. 

[guyonphone]

Solved my issue!

 

My SSD is a Samsung 860 1TB. 

My Motherboard's chipset is AMD SB950.

Apparently there is an issue with Samsung 860 EVO SSDs and the AMD 9XX Chipsets. 

In my system of 24 drives I have an LSI HBA card which handles 16 drives with SAS-8087 connectors. And I use reverse breakout cables to Sata on my motherboard controller. I simply swapped my Cache Drive onto a port handled by the LSI Controller and this immediately solved my problem. 

 

Thanks!

Edited October 25, 2018 by guyonphone