Problems with the cache device:
Feb 5 11:21:11 Tower kernel: sd 13:0:2:0: Power-on or device reset occurred
Feb 5 11:21:11 Tower kernel: mpt2sas_cm0: log_info(0x31120303): originator(PL), code(0x12), sub_code(0x0303)
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Feb 5 11:21:11 Tower kernel: sd 13:0:2:0: [sdf] tag#175 UNKNOWN(0x2003) Result: hostbyte=0x0b driverbyte=0x00
Feb 5 11:21:11 Tower kernel: sd 13:0:2:0: [sdf] tag#175 CDB: opcode=0x2a 2a 00 00 00 b7 c0 00 00 40 00
Feb 5 11:21:11 Tower kernel: print_req_error: I/O error, dev sdf, sector 47040
Feb 5 11:21:11 Tower kernel: BTRFS error (device sdf1): bdev /dev/sdf1 errs: wr 3, rd 0, flush 0, corrupt 0, gen 0
Feb 5 11:21:11 Tower kernel: BTRFS error (device sdf1): bdev /dev/sdf1 errs: wr 4, rd 0, flush 0, corrupt 0, gen 0
Feb 5 11:21:11 Tower kernel: mpt2sas_cm0: log_info(0x31120303): originator(PL), code(0x12), sub_code(0x0303)
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Feb 5 11:21:12 Tower kernel: sd 13:0:2:0: Power-on or device reset occurred
Feb 5 11:21:12 Tower kernel: mpt2sas_cm0: log_info(0x31120303): originator(PL), code(0x12), sub_code(0x0303)
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Feb 5 11:21:13 Tower kernel: mpt2sas_cm0: log_info(0x31111000): originator(PL), code(0x11), sub_code(0x1000)
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Feb 5 11:21:13 Tower kernel: sd 13:0:2:0: [sdf] tag#184 UNKNOWN(0x2003) Result: hostbyte=0x0b driverbyte=0x00
Feb 5 11:21:13 Tower kernel: sd 13:0:2:0: [sdf] tag#184 CDB: opcode=0x2a 2a 00 00 29 86 40 00 00 20 00
Feb 5 11:21:13 Tower kernel: print_req_error: I/O error, dev sdf, sector 2721344
Try it on a different controller.