Have been having problems with my UNRAID server for a while. Keep having 1 or both parity disks being kicked out of the server. It can be working fine for days/week(s) at a time before it happens. Tried many different things to isolate the problem. Move UNRAID to a new USB stick. Turned off UDMA CRC check. Removed a back-plane in the server box as I thought it was unstable so the power and SATA cables are connected directly to the harddrives. Used at different motherboard and RAM. The disk I am having problems with are Seagate Ironwolfs. Outside the array I can run SMART selftest and they never fails these. I can format without issues. The only thing I have not yet changed out is the power supply (a Seagate 300 watt and it should be strong enough to run a N100 CPU motherboard and 5 harddrives). I use the same PSU in another UNRAID server with more disks and same motherboard without any issues at all.

Any help anyone can provide is highly appreciated.

svgtower-diagnostics-20251015-2038.zip

Looks like a bad SATA cable. Replace the cable or swap with another disk and see where the issue follows.