So, we're back at smart errors.
Disk was at "reported uncorrect = 1" when I re-plugged it (before rebuilding the array).
I acknowledged the issue and let the server run, it rebuilt and there was no error.
This night I received a mail after parity check saying it failed, with "Disk 5 - ST4000VN006-3CW104_ZW603BKR (sdk) - active 32 C (disk has read errors) [NOK]" with reported uncorrect gone to 2.
System log show some read errors on disk 5, on sectors close to each other, but no more disk reset with the new controller. It is a quite recent disk BTW.
Nov 26 04:15:21 NAStorm kernel: ata22.00: exception Emask 0x0 SAct 0x7f SErr 0x0 action 0x0
Nov 26 04:15:21 NAStorm kernel: ata22.00: error: { UNC }
Nov 26 04:15:21 NAStorm kernel: I/O error, dev sdk, sector 146077392 op 0x0:(READ) flags 0x0 phys_seg 59 prio class 2
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077328
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077336
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077344
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077352
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077360
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077368
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077376
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077384
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077392
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077400
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077408
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077416
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077424
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077432
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077440
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077448
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077456
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077464
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077472
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077480
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077488
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077496
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077504
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077512
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077520
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077528
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077536
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077544
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077552
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077560
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077568
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077576
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077584
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077592
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077600
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077608
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077616
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077624
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077632
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077640
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077648
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077656
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077664
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077672
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077680
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077688
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077696
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077704
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077712
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077720
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077728
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077736
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077744
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077752
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077760
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077768
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077776
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077784
Nov 26 04:15:21 NAStorm kernel: md: disk5 read error, sector=146077792
Nov 26 04:30:15 NAStorm root: Fix Common Problems: Error: disk5 (ST4000VN006-3CW104_ZW603BKR) has read errors
I'm attaching current diagnostics.
nastorm-diagnostics-20231127-1642.zip