Hi there,

 

I can see in my syslog lots of these error message 

May 16 10:53:43 Tower kernel: ata2.00: status: { DRDY }
May 16 10:53:43 Tower kernel: ata2.00: failed command: READ FPDMA QUEUED
May 16 10:53:43 Tower kernel: ata2.00: cmd 60/08:30:b0:89:2c/00:00:43:00:00/40 tag 6 ncq dma 4096 in
May 16 10:53:43 Tower kernel:         res 40/00:00:a8:2d:79/00:00:00:00:00/40 Emask 0x10 (ATA bus error)
May 16 10:53:43 Tower kernel: ata2.00: status: { DRDY }
May 16 10:53:43 Tower kernel: ata2.00: failed command: WRITE FPDMA QUEUED
May 16 10:53:43 Tower kernel: ata2.00: cmd 61/00:a8:a8:29:79/04:00:00:00:00/40 tag 21 ncq dma 524288 out
May 16 10:53:43 Tower kernel:         res 40/00:00:a8:2d:79/00:00:00:00:00/40 Emask 0x10 (ATA bus error)
May 16 10:53:43 Tower kernel: ata2.00: status: { DRDY }
May 16 10:53:43 Tower kernel: ata2.00: failed command: WRITE FPDMA QUEUED
May 16 10:53:43 Tower kernel: ata2.00: cmd 61/68:b0:a8:2d:79/02:00:00:00:00/40 tag 22 ncq dma 315392 out
May 16 10:53:43 Tower kernel:         res 40/00:00:a8:2d:79/00:00:00:00:00/40 Emask 0x10 (ATA bus error)
May 16 10:53:43 Tower kernel: ata2.00: status: { DRDY }
May 16 10:53:43 Tower kernel: ata2: hard resetting link
May 16 10:53:49 Tower kernel: ata2: link is slow to respond, please be patient (ready=0)
May 16 10:53:53 Tower kernel: ata2: COMRESET failed (errno=-16)
May 16 10:53:53 Tower kernel: ata2: hard resetting link
May 16 10:53:54 Tower kernel: ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
May 16 10:53:54 Tower kernel: ata2.00: supports DRM functions and may not be fully accessible

 

is this from the SAS controller or a specific drive? any help greatly appreciated.

tower-diagnostics-20220516-1055.zip

if I understand the logs correctly it appears to affect my first parity disk, do I understand this correctly? ata2.00: ATA-9: WDC WD140EDFZ-11A0VA0, 81.00A81, max UDMA/133

Looks more like a power/connection problem, check/replace/swap cables on parity2.