Usually I get none.  Sometimes I get one or two or three, which I generally ignore.  This month I go fourteen.  Diags attached.  This is interesting, never seen it in the log before.:

 

Aug 21 03:00:36 ffs2 kernel: ata12.00: exception Emask 0x10 SAct 0x0 SErr 0x400000 action 0x6 frozen
Aug 21 03:00:36 ffs2 kernel: ata12.00: irq_stat 0x08000000, interface fatal error
Aug 21 03:00:36 ffs2 kernel: ata12: SError: { Handshk }
Aug 21 03:00:36 ffs2 kernel: ata12.00: failed command: WRITE DMA EXT
Aug 21 03:00:36 ffs2 kernel: ata12.00: cmd 35/00:b8:f0:ea:82/00:01:4b:01:00/e0 tag 5 dma 225280 out
Aug 21 03:00:36 ffs2 kernel:         res 50/00:00:f0:ea:82/00:00:4b:01:00/e0 Emask 0x10 (ATA bus error)
Aug 21 03:00:36 ffs2 kernel: ata12.00: status: { DRDY }
Aug 21 03:00:36 ffs2 kernel: ata12: hard resetting link
Aug 21 03:00:37 ffs2 kernel: ata12: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Aug 21 03:00:37 ffs2 kernel: ata12.00: configured for UDMA/133
Aug 21 03:00:37 ffs2 kernel: ata12: EH complete
Aug 21 03:00:37 ffs2 kernel: ata12.00: exception Emask 0x10 SAct 0x0 SErr 0x400000 action 0x6 frozen
Aug 21 03:00:37 ffs2 kernel: ata12.00: irq_stat 0x08000000, interface fatal error
Aug 21 03:00:37 ffs2 kernel: ata12: SError: { Handshk }
Aug 21 03:00:37 ffs2 kernel: ata12.00: failed command: WRITE DMA EXT
Aug 21 03:00:37 ffs2 kernel: ata12.00: cmd 35/00:40:a8:ec:82/00:05:4b:01:00/e0 tag 17 dma 688128 out
Aug 21 03:00:37 ffs2 kernel:         res 50/00:00:a8:04:83/00:00:4b:01:00/e0 Emask 0x10 (ATA bus error)
Aug 21 03:00:37 ffs2 kernel: ata12.00: status: { DRDY }
Aug 21 03:00:37 ffs2 kernel: ata12: hard resetting link
Aug 21 03:00:37 ffs2 kernel: ata12: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Aug 21 03:00:37 ffs2 kernel: ata12.00: configured for UDMA/133
Aug 21 03:00:37 ffs2 kernel: ata12: EH complete
Aug 21 03:00:37 ffs2 kernel: ata12.00: exception Emask 0x10 SAct 0x0 SErr 0x400000 action 0x6 frozen
Aug 21 03:00:37 ffs2 kernel: ata12.00: irq_stat 0x08000000, interface fatal error
Aug 21 03:00:37 ffs2 kernel: ata12: SError: { Handshk }
Aug 21 03:00:37 ffs2 kernel: ata12.00: failed command: WRITE DMA EXT
Aug 21 03:00:37 ffs2 kernel: ata12.00: cmd 35/00:40:a8:ec:82/00:05:4b:01:00/e0 tag 19 dma 688128 out
Aug 21 03:00:37 ffs2 kernel:         res 50/00:02:00:00:00/00:00:00:00:00/a0 Emask 0x10 (ATA bus error)
Aug 21 03:00:37 ffs2 kernel: ata12.00: status: { DRDY }
Aug 21 03:00:37 ffs2 kernel: ata12: hard resetting link
Aug 21 03:00:38 ffs2 kernel: ata12: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Aug 21 03:00:38 ffs2 kernel: ata12.00: configured for UDMA/133
Aug 21 03:00:38 ffs2 kernel: ata12: EH complete
Aug 21 03:00:38 ffs2 kernel: ata12: limiting SATA link speed to 3.0 Gbps
Aug 21 03:00:38 ffs2 kernel: ata12.00: exception Emask 0x10 SAct 0x0 SErr 0x400000 action 0x6 frozen
Aug 21 03:00:38 ffs2 kernel: ata12.00: irq_stat 0x08000000, interface fatal error
Aug 21 03:00:38 ffs2 kernel: ata12: SError: { Handshk }
Aug 21 03:00:38 ffs2 kernel: ata12.00: failed command: WRITE DMA EXT
Aug 21 03:00:38 ffs2 kernel: ata12.00: cmd 35/00:40:68:fc:82/00:05:4b:01:00/e0 tag 0 dma 688128 out
Aug 21 03:00:38 ffs2 kernel:         res 50/00:00:68:fc:82/00:00:4b:01:00/e0 Emask 0x10 (ATA bus error)
Aug 21 03:00:38 ffs2 kernel: ata12.00: status: { DRDY }
Aug 21 03:00:38 ffs2 kernel: ata12: hard resetting link
Aug 21 03:00:38 ffs2 kernel: ata12: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
Aug 21 03:00:38 ffs2 kernel: ata12.00: configured for UDMA/133
Aug 21 03:00:38 ffs2 kernel: ata12: EH complete

 

 

The parity check completed on the 17th of Sept so these errors are not related, or are they.... syslog stops at 10 Sept (!)

 

ffs2-diagnostics-20170918-0511.zip

20 minutes ago, tucansam said:

Usually I get none.  Sometimes I get one or two or three, which I generally ignore.

 

You shouldn't ignore them, the only acceptable number of sync errors is 0.

 

Since there's nothing in the logs about the parity check no clue, any unclean shutdowns between checks?

 

As for the ATA errors start by checking/replacing cables don disk13.