Cache device dropped offline:
Oct 22 19:43:47 HRH-UNRAID kernel: ata4: limiting SATA link speed to 3.0 Gbps
Oct 22 19:43:47 HRH-UNRAID kernel: ata4: hard resetting link
Oct 22 19:43:52 HRH-UNRAID kernel: ata4: softreset failed (1st FIS failed)
Oct 22 19:43:52 HRH-UNRAID kernel: ata4: reset failed, giving up
Oct 22 19:43:52 HRH-UNRAID kernel: ata4.00: disabled
Oct 22 19:43:52 HRH-UNRAID kernel: ata4: EH complete
Oct 22 19:43:52 HRH-UNRAID kernel: sd 4:0:0:0: [sdb] tag#7 UNKNOWN(0x2003) Result: hostbyte=0x04 driverbyte=0x00
Oct 22 19:43:52 HRH-UNRAID kernel: sd 4:0:0:0: [sdb] tag#7 CDB: opcode=0x2a 2a 00 06 fa 92 80 00 06 00 00
Oct 22 19:43:52 HRH-UNRAID kernel: print_req_error: I/O error, dev sdb, sector 117084800
Check connections.