Timeout errors on multiple drives, likely a controller or cable problem, your cache device (ata7) ended up disable:

 

Dec 12 02:01:21 Tower kernel: ata7.00: exception Emask 0x0 SAct 0x180000 SErr 0x0 action 0x6 frozen
Dec 12 02:01:21 Tower kernel: ata7.00: failed command: WRITE FPDMA QUEUED
Dec 12 02:01:21 Tower kernel: ata7.00: cmd 61/08:98:40:00:02/00:00:00:00:00/40 tag 19 ncq dma 4096 out
Dec 12 02:01:21 Tower kernel:         res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Dec 12 02:01:21 Tower kernel: ata7.00: status: { DRDY }
Dec 12 02:01:21 Tower kernel: ata7.00: failed command: WRITE FPDMA QUEUED
Dec 12 02:01:21 Tower kernel: ata7.00: cmd 61/08:a0:40:00:00/00:00:20:00:00/40 tag 20 ncq dma 4096 out
Dec 12 02:01:21 Tower kernel:         res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Dec 12 02:01:21 Tower kernel: ata7.00: status: { DRDY }
Dec 12 02:01:21 Tower kernel: ata7: hard resetting link
Dec 12 02:01:27 Tower kernel: ata7: link is slow to respond, please be patient (ready=0)
Dec 12 02:01:31 Tower kernel: ata7: COMRESET failed (errno=-16)
Dec 12 02:01:31 Tower kernel: ata7: hard resetting link
Dec 12 02:01:37 Tower kernel: ata7: link is slow to respond, please be patient (ready=0)
Dec 12 02:01:41 Tower kernel: ata7: COMRESET failed (errno=-16)
Dec 12 02:01:41 Tower kernel: ata7: hard resetting link
Dec 12 02:01:47 Tower kernel: ata7: link is slow to respond, please be patient (ready=0)
Dec 12 02:01:52 Tower kernel: ata9.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
Dec 12 02:01:52 Tower kernel: ata9.00: failed command: WRITE DMA EXT
Dec 12 02:01:52 Tower kernel: ata9.00: cmd 35/00:40:d8:c8:15/00:05:6b:00:00/e0 tag 28 dma 688128 out
Dec 12 02:01:52 Tower kernel:         res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Dec 12 02:01:52 Tower kernel: ata9.00: status: { DRDY }
Dec 12 02:01:52 Tower kernel: ata9: hard resetting link
Dec 12 02:01:52 Tower kernel: ata10.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
Dec 12 02:01:52 Tower kernel: ata10.00: failed command: WRITE DMA EXT
Dec 12 02:01:52 Tower kernel: ata10.00: cmd 35/00:40:d8:db:15/00:05:6b:00:00/e0 tag 15 dma 688128 out
Dec 12 02:01:52 Tower kernel:         res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Dec 12 02:01:52 Tower kernel: ata10.00: status: { DRDY }
Dec 12 02:01:52 Tower kernel: ata10: hard resetting link
Dec 12 02:01:53 Tower kernel: ata9: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Dec 12 02:01:53 Tower kernel: ata10: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Dec 12 02:01:58 Tower kernel: ata10.00: qc timeout (cmd 0xec)
Dec 12 02:01:58 Tower kernel: ata9.00: qc timeout (cmd 0xec)
Dec 12 02:01:59 Tower kernel: ata9.00: failed to IDENTIFY (I/O error, err_mask=0x4)
Dec 12 02:01:59 Tower kernel: ata9.00: revalidation failed (errno=-5)
Dec 12 02:01:59 Tower kernel: ata9: hard resetting link
Dec 12 02:01:59 Tower kernel: ata10.00: failed to IDENTIFY (I/O error, err_mask=0x4)
Dec 12 02:01:59 Tower kernel: ata10.00: revalidation failed (errno=-5)
Dec 12 02:01:59 Tower kernel: ata10: hard resetting link
Dec 12 02:02:00 Tower kernel: ata10: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Dec 12 02:02:00 Tower kernel: ata9: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Dec 12 02:02:10 Tower kernel: ata10.00: qc timeout (cmd 0xec)
Dec 12 02:02:10 Tower kernel: ata9.00: qc timeout (cmd 0xec)
Dec 12 02:02:11 Tower kernel: ata10.00: failed to IDENTIFY (I/O error, err_mask=0x4)
Dec 12 02:02:11 Tower kernel: ata10.00: revalidation failed (errno=-5)
Dec 12 02:02:11 Tower kernel: ata10: limiting SATA link speed to 3.0 Gbps
Dec 12 02:02:11 Tower kernel: ata10: hard resetting link
Dec 12 02:02:11 Tower kernel: ata9.00: failed to IDENTIFY (I/O error, err_mask=0x4)
Dec 12 02:02:11 Tower kernel: ata9.00: revalidation failed (errno=-5)
Dec 12 02:02:11 Tower kernel: ata9: limiting SATA link speed to 3.0 Gbps
Dec 12 02:02:11 Tower kernel: ata9: hard resetting link
Dec 12 02:02:11 Tower kernel: ata10: SATA link up 6.0 Gbps (SStatus 133 SControl 320)
Dec 12 02:02:11 Tower kernel: ata9: SATA link up 6.0 Gbps (SStatus 133 SControl 320)
Dec 12 02:02:16 Tower kernel: ata7: COMRESET failed (errno=-16)
Dec 12 02:02:16 Tower kernel: ata7: limiting SATA link speed to 3.0 Gbps
Dec 12 02:02:16 Tower kernel: ata7: hard resetting link
Dec 12 02:02:21 Tower shfs/user: err: shfs_read: read: (5) Input/output error
Dec 12 02:02:21 Tower kernel: ata7: COMRESET failed (errno=-16)
Dec 12 02:02:21 Tower kernel: ata7: reset failed, giving up
Dec 12 02:02:21 Tower kernel: ata7.00: disabled
Dec 12 02:02:21 Tower kernel: ata7: EH complete

 

Thank you.

Everything looks normal now, you'll need to resync both parity disks or since they are mostly valid you can do a new config with trust parity and then run a correcting check.

I'm just letting parity run it s new course

P.S. you want to avoid the 4 Marvell ports (the first four 4 white ports) at all costs, guess where all the problem disks were connected on the previous diagnostics?

You are correct, I moved the two parity drives to SATAIII_0 & SATAIII_1 but left the cache drive on SATAIII_M0. 

32 minutes ago, deaerator said:

but left the cache drive on SATAIII_M0. 

You should move it also.