Hello,
I'm attaching the diagnostics here. One of my 2 parity drives has read errors as does 1 of my 3 array drives. Funny, they are just shy of their warranty. Are these read errors a bad disk or something file system related?
server-diagnostics-20201002-0739.zip
It's a problem with the SATA controller, quite common on Ryzen boards, there are reports that the newer kernel on the latest betas help with those, or disable IOMMU if not needed.