Sata port multipliers never worked right for me especially on other OSs other than windows. Stick ith SAS
Oh I agree. I was just pissed when I wrote that. I was just getting tired of screwing around with this stuff. I like to tinker but when trying to reduce my spindle count results in so many issues.. needless to say I was frustrated.
I did more testing over the last few days and have these conclusions after trying different connections based on a Reddit users suggestion.
Connecting the 4TB & 8TB drives via SATA to 8087 breakout cable and from there to a 8087 to 8088 conversion and finally connecting that with a 8088 to 8088 cable to the back of the LSI SAS9201-16e resulted in no errors and full speed data transfer. That was the long way spaghetti cable way of doing the test but it's what I had on hand.
We know we have users with 30+ 8TB Reds in their chassis, so I know the chassis including the SAS3 backplanes and dual SAS3 expanders run properly with these drives. With the above test I now know the LSI SAS9201-16e handles the drives properly when directly connected.
So my issue appears to be the LSI SAS9201-16e just doesn't like a mixture of the QSFP to 8088 cables combined with the 4/8TB drives firmware. Something isn't communicating correctly. The chassis + cables + SAS card communicate properly using my 2TB drives of varying brands/models so I know the individual components are good. I even went as far as putting the 4TB/8TB drives in a different chassis with 8087 to 8088 cable and again, full speed error free operation with the LSI SAS9201-16e.
I also have zero issues reading/writing at full speeds without errors using my older Supermicro SAS2LP card with these chassis and my QSFP to 8088 cable. So that again tells me my chassis + cables are working properly.
I could understand if the cable flat out refused to see the drives, but since it does see them, writes to the drives at full speeds, and does so error free and then falls on its ass during reads is mind boggling to say the least.
This is by far the weirdest issue I have come across in quite some time. I'm only posting my finding as someone else may have a similar issue with a different chassis or cable and find the above testing helpful.
So for now these chassis will sit empty and idle till I either sell them or score a deal on some SAS3 cards and new cables. The 8TB drives are currently running full speed and error free in my Chenbro 12 bay chassis. Some are acting as JBOD chassis connected to that same LSI card from above and some are running off PCIe 1x (4 port) SATA cards.
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