compund_soil

Thanks. I'll try that. They were both manufactured and purchased on the same day, which seems like maybe more than coincidence. They are still under warranty if extended SMART fails. At this point is my only real solution to wipe the array and start over? I am well backed up, but I have 60TB of data and this will be painful. I am trying to crash this plane into the ground as gently as possible. Guess I'll use dual drive redundancy moving forward.

Thanks for the quick reply. A couple of points of interest. I only used the SATA port multiplier to rule out my HBA. I have been using a LSI 9211-8i P20 (IT Mode) for over a year and it has worked perfectly. Also, is was this HBA that the drives were connected to when the issue occurred. I have re-connected the HBA and attached 4 drives, and connected the other 4 drives (including the two that fell off the array) to the MOBO intel Z77 SATA ports. Issue still persist. Diagnostics file with this configuration is attached. Also, I have an old linux box and the drives that are now 'unassigned' are recognized by linux but will not mount. thanks again. Scott unraid-diagnostics-20220704-1221.zip

Howdy, I had an issue where I could not access a bunch of folders (not a permissions issue, OS just kept spinning and folder would never open). Ran a parity check and all was fine, rebooted the machine and now two of my array drives are listed at 'unassigned.' I only have single drive parity and I'm trying to recover data. Not sure the best way to go about this? I've switched out HBAs and plugged drives directly into board. They still show up as 'unassigned.' I've attached a diagnostics file. any help is appreciated. thanks. Scott unraid-diagnostics-20220704-0743.zip

This is EXACTLY what I'm experiencing right now. I will try your mitigation steps when I get home. Thank you for thorough write-up! Did the parity check in 'maintenance mode' clear up everything? I assumed I had some permission issues, but I'll try your approach first.

Same issue with a MBP running 10.15. I saturate a 2.5 Gbe connection when writing to the array (cache drive), but READING from it to my MBP NVME drive will only give me 300 Mb/s (LAN on both sides running through a 10Gbe SFP+ switch). I've done most of the same troubleshooting as you have. Just here to say you're not alone. I will post here if I find my answer.