[CentOS] tracing the source of a sector error from smartd

Mon May 10 23:41:52 UTC 2010
nate <centos at linuxpowered.net>

I'm not used to using smartd, but have a new set of systems
that don't have any sort of RAID on them, so I enabled
smartd (18 systems 4 SATA drives each).

Running CentOS 5.4 64-bit ..

One of them has emailed me twice(despite it saying it
would only email me once) saying it has

1 Offline uncorrectable sectors

But when I try to find more information, smartctl seems to
think everything is fine.

=== START OF INFORMATION SECTION ===
Device Model:     WDC WD1002FBYS-18W8B0
Serial Number:    WD-WMATV5930306
Firmware Version: 03.00C09
User Capacity:    1,000,204,886,016 bytes
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   8
ATA Standard is:  Exact ATA specification draft version not indicated
Local Time is:    Mon May 10 16:36:22 2010 PDT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x82) Offline data collection activity
                                        was completed without error.
                                        Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0) The previous self-test routine
completed
                                        without error or no self-test has ever
                                        been run.
Total time to complete Offline
data collection:                 (18000) seconds.
Offline data collection
capabilities:                    (0x7b) SMART execute Offline immediate.
                                        Auto Offline data collection on/off
support.
                                        Suspend Offline collection upon new
                                        command.
                                        Offline surface scan supported.
                                        Self-test supported.
                                        Conveyance Self-test supported.
                                        Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
                                        power-saving mode.
                                        Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
                                        General Purpose Logging supported.
Short self-test routine
recommended polling time:        (   2) minutes.
Extended self-test routine
recommended polling time:        ( 208) minutes.
Conveyance self-test routine
recommended polling time:        (   5) minutes.
SCT capabilities:              (0x303f) SCT Status supported.
                                        SCT Feature Control supported.
                                        SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED 
WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail  Always    
  -       0
  3 Spin_Up_Time            0x0027   253   253   021    Pre-fail  Always    
  -       1091
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always    
  -       15
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always    
  -       0
  7 Seek_Error_Rate         0x002e   100   253   000    Old_age   Always    
  -       0
  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always    
  -       523
 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    
  -       14
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always    
  -       13
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always    
  -       1
194 Temperature_Celsius     0x0022   117   109   000    Old_age   Always    
  -       33
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always    
  -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always    
  -       1
198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline   
  -       1
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always    
  -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline   
  -       1

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours) 
LBA_of_first_error
# 1  Extended offline    Completed without error       00%        68         -
# 2  Short offline       Completed without error       00%        60         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

---

/var/log/messages has tons of entries that say

Device: /dev/sdc, 1 Currently unreadable (pending) sectors


Since it's only 1 disk out of 72 I suspect it's the disk at fault
rather than something with smartd..

Any ideas?

thanks

nate