Hey there,
It seems like i have the same problem. This is also a new unRAID build but i already move about 12 TB of data to it (its just a backup server)
But in my case im using the onboard SATA Controller
Currently using 4 x 8 TB Seagate IronWolf Drives and 2 x 4 TB Seagate IronWolf Drives
First Parity Check with Corretion:
Feb 19 16:18:30 Tower kernel: md: recovery thread: P corrected, sector=2743151176
Feb 19 16:18:30 Tower kernel: md: recovery thread: P corrected, sector=2743151184
Feb 19 16:18:30 Tower kernel: md: recovery thread: P corrected, sector=2743151192
Feb 19 16:18:30 Tower kernel: md: recovery thread: P corrected, sector=2743151200
Feb 19 16:18:30 Tower kernel: md: recovery thread: P corrected, sector=2743151208
Feb 19 17:06:26 Tower kernel: md: recovery thread: P corrected, sector=3907018616
Feb 19 21:07:56 Tower kernel: md: recovery thread: P corrected, sector=8589960632
Feb 19 21:07:58 Tower kernel: md: recovery thread: P corrected, sector=8590443896
Second Check without Corretion this going at this point (currently its at 23,6% done with the second check):
Feb 20 17:31:52 Tower kernel: md: recovery thread: P incorrect, sector=2743151176
Feb 20 17:31:52 Tower kernel: md: recovery thread: P incorrect, sector=2743151184
Feb 20 17:31:52 Tower kernel: md: recovery thread: P incorrect, sector=2743151192
Feb 20 17:31:52 Tower kernel: md: recovery thread: P incorrect, sector=2743151200
Feb 20 17:31:52 Tower kernel: md: recovery thread: P incorrect, sector=2743151208
As you can see the sectors are identical.
The interesting Part is that i also build a second system with slightly different hardware (this one uses 4 x 8 TB Seagate IronWolf Drives and an intel CPU instead of an AMD)
and the same error occurred on those discs aswell in the same exact sector.
First Parity Check with Corretion:
Feb 20 00:44:53 Phoenix kernel: md: recovery thread: P corrected, sector=2743151176
Feb 20 00:44:53 Phoenix kernel: md: recovery thread: P corrected, sector=2743151184
Feb 20 00:44:53 Phoenix kernel: md: recovery thread: P corrected, sector=2743151192
Feb 20 00:44:53 Phoenix kernel: md: recovery thread: P corrected, sector=2743151200
Feb 20 00:44:53 Phoenix kernel: md: recovery thread: P corrected, sector=2743151208
However when i first build the second system with the 4 x 8 TB Seagate Drives i was using the Mainboard, CPU and RAM from the other system.
Maybe thats a hint?
Right now im also running a second parity check on the second system about 32,1 % done so far so good.
*Edit*
Oh and all discs are fine no smart errors