chyby na kabalu?

Zdravím po čase s dotazem. btrfs mi na RAID 1 píše:

sudo btrfs device stats /mnt/archiv    
[/dev/mapper/to18a].write_io_errs    968779066
[/dev/mapper/to18a].read_io_errs     483935772
[/dev/mapper/to18a].flush_io_errs    1106
[/dev/mapper/to18a].corruption_errs  258118
[/dev/mapper/to18a].generation_errs  40
[/dev/mapper/to18b].write_io_errs    0
[/dev/mapper/to18b].read_io_errs     0
[/dev/mapper/to18b].flush_io_errs    0
[/dev/mapper/to18b].corruption_errs  0
[/dev/mapper/to18b].generation_errs  0

to18a a b jsou LUKS volumy nad 18TB Toshiba MG09 disky přičemž SMART pro disk A říká:

ID# ATTRIBUTE_NAME          FLAGS    VALUE WORST THRESH FAIL RAW_VALUE
  1 Raw_Read_Error_Rate     PO-R--   100   100   050    -    0
  2 Throughput_Performance  P-S---   100   100   050    -    0
  3 Spin_Up_Time            POS--K   100   100   001    -    7415
  4 Start_Stop_Count        -O--CK   100   100   000    -    75
  5 Reallocated_Sector_Ct   PO--CK   100   100   010    -    0
  7 Seek_Error_Rate         PO-R--   100   100   050    -    0
  8 Seek_Time_Performance   P-S---   100   100   050    -    0
  9 Power_On_Hours          -O--CK   090   090   000    -    4217
 10 Spin_Retry_Count        PO--CK   100   100   030    -    0
 12 Power_Cycle_Count       -O--CK   100   100   000    -    75
 23 Helium_Condition_Lower  PO---K   100   100   075    -    0
 24 Helium_Condition_Upper  PO---K   100   100   075    -    0
 27 MAMR_Health_Monitor     PO---K   100   100   030    -    262998
191 G-Sense_Error_Rate      -O--CK   100   100   000    -    2
192 Power-Off_Retract_Count -O--CK   100   100   000    -    14
193 Load_Cycle_Count        -O--CK   100   100   000    -    671
194 Temperature_Celsius     -O---K   100   100   000    -    45 (Min/Max 14/52)
196 Reallocated_Event_Count PO--CK   100   100   010    -    0
197 Current_Pending_Sector  -O--CK   100   100   000    -    0
198 Offline_Uncorrectable   ----CK   100   100   000    -    0
199 UDMA_CRC_Error_Count    -O--CK   200   200   000    -    0
220 Disk_Shift              -O----   100   100   000    -    136314892
222 Loaded_Hours            -O--CK   096   096   000    -    1863
223 Load_Retry_Count        -O--CK   100   100   000    -    0
224 Load_Friction           -O---K   100   100   000    -    0
226 Load-in_Time            -OS--K   100   100   000    -    686
240 Head_Flying_Hours       P-----   100   100   001    -    0
241 Total_LBAs_Written      -O--CK   100   100   000    -    37515995988
242 Total_LBAs_Read         -O--CK   100   100   000    -    76960391775

tedy vlastně bez chyb. Mám to chápat tak že chyby jsou v kabelu a díky btrfs jsou zachyceny?

B disk má SMART skoro stejný:

ID# ATTRIBUTE_NAME          FLAGS    VALUE WORST THRESH FAIL RAW_VALUE
  1 Raw_Read_Error_Rate     PO-R--   100   100   050    -    0
  2 Throughput_Performance  P-S---   100   100   050    -    0
  3 Spin_Up_Time            POS--K   100   100   001    -    7518
  4 Start_Stop_Count        -O--CK   100   100   000    -    75
  5 Reallocated_Sector_Ct   PO--CK   100   100   010    -    0
  7 Seek_Error_Rate         PO-R--   100   100   050    -    0
  8 Seek_Time_Performance   P-S---   100   100   050    -    0
  9 Power_On_Hours          -O--CK   090   090   000    -    4216
 10 Spin_Retry_Count        PO--CK   100   100   030    -    0
 12 Power_Cycle_Count       -O--CK   100   100   000    -    75
 23 Helium_Condition_Lower  PO---K   100   100   075    -    0
 24 Helium_Condition_Upper  PO---K   100   100   075    -    0
 27 MAMR_Health_Monitor     PO---K   100   100   030    -    395100
191 G-Sense_Error_Rate      -O--CK   100   100   000    -    0
192 Power-Off_Retract_Count -O--CK   100   100   000    -    14
193 Load_Cycle_Count        -O--CK   100   100   000    -    516
194 Temperature_Celsius     -O---K   100   100   000    -    43 (Min/Max 14/50)
196 Reallocated_Event_Count PO--CK   100   100   010    -    0
197 Current_Pending_Sector  -O--CK   100   100   000    -    0
198 Offline_Uncorrectable   ----CK   100   100   000    -    0
199 UDMA_CRC_Error_Count    -O--CK   200   200   000    -    0
220 Disk_Shift              -O----   100   100   000    -    34209796
222 Loaded_Hours            -O--CK   096   096   000    -    1785
223 Load_Retry_Count        -O--CK   100   100   000    -    0
224 Load_Friction           -O---K   100   100   000    -    0
226 Load-in_Time            -OS--K   100   100   000    -    680
240 Head_Flying_Hours       P-----   100   100   001    -    0
241 Total_LBAs_Written      -O--CK   100   100   000    -    38439946664
242 Total_LBAs_Read         -O--CK   100   100   000    -    76575765271

Dotaz: chyby na kabalu?