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how to fix logical bad sectors

i am using RAID 1 on 2x500GB harddrives. and one of my drive shows
Current_Pending_Sector 154. how can i fix that.


root@lion:~# smartctl -A /dev/sda
 1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail
Always       -       1
  3 Spin_Up_Time            0x0027   152   150   021    Pre-fail
Always       -       3375
  4 Start_Stop_Count        0x0032   100   100   000    Old_age
Always       -       59
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail
Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age
Always       -       0
  9 Power_On_Hours          0x0032   072   072   000    Old_age
Always       -       21113
 10 Spin_Retry_Count        0x0032   100   253   000    Old_age
Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age
Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age
Always       -       57
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age
Always       -       48
193 Load_Cycle_Count        0x0032   177   177   000    Old_age
Always       -       70694
194 Temperature_Celsius     0x0022   117   099   000    Old_age
Always       -       26
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age
Always       -       0
197 Current_Pending_Sector  0x0032   199   199   000    Old_age
Always       -       154
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age
Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age
Always       -       0
200 Multi_Zone_Error_Rate   0x0008   100   253   000    Old_age
Offline      -       0

root@lion:~# smartctl -A /dev/sdb
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail
Always       -       0
  3 Spin_Up_Time            0x0027   150   148   021    Pre-fail
Always       -       3475
  4 Start_Stop_Count        0x0032   100   100   000    Old_age
Always       -       55
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail
Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age
Always       -       0
  9 Power_On_Hours          0x0032   081   081   000    Old_age
Always       -       14265
 10 Spin_Retry_Count        0x0032   100   253   000    Old_age
Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age
Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age
Always       -       53
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age
Always       -       45
193 Load_Cycle_Count        0x0032   189   189   000    Old_age
Always       -       34955
194 Temperature_Celsius     0x0022   117   099   000    Old_age
Always       -       26
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age
Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age
Always       -       0
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age
Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age
Always       -       0
200 Multi_Zone_Error_Rate   0x0008   100   253   000    Old_age
Offline      -       0

this is the first time i am dealing with this, is this some thing that
i have to be worried about?


Thanks,
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