é UNC S.M.A.R.T. Erro sério? precisa agir?

Question

Tenho um Raptor Western Digital de 300G, mostrando recentemente o UNC SMART, perguntando a alguém que tem experiência sabe se devo substituí-lo e obter o formulário de garantia WD?

Detalhes do smartctl -a da seguinte forma:

smartctl 5.41 2011-06-09 r3365 [FreeBSD 8.2-RELEASE-p6 amd64] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital VelociRaptor
Device Model:     WDC WD3000HLFS-01G6U0
Serial Number:    WD-WXD0C79C8807
LU WWN Device Id: 5 0014ee 0ac3cfaf0
Firmware Version: 04.04V01
User Capacity:    300,069,052,416 bytes [300 GB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   8
ATA Standard is:  Exact ATA specification draft version not indicated
Local Time is:    Thu Apr 19 16:03:33 2012 CST
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:  (0x84) Offline data collection activity
                    was suspended by an interrupting command from host.
                    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:        ( 4800) 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:    (  59) minutes.
Conveyance self-test routine
recommended polling time:    (   5) minutes.
SCT capabilities:          (0x303f) SCT Status supported.
                    SCT Error Recovery Control 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     0x000f   195   195   051    Pre-fail  Always       -       49036
  3 Spin_Up_Time            0x0003   199   196   021    Pre-fail  Always       -       3008
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       425
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   086   086   000    Old_age   Always       -       10292
 10 Spin_Retry_Count        0x0012   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0012   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       404
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       268
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       426
194 Temperature_Celsius     0x0022   117   100   000    Old_age   Always       -       30
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0012   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0010   200   200   000    Old_age   Offline      -       4
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       1

SMART Error Log Version: 1
ATA Error Count: 749 (device log contains only the most recent five errors)
    CR = Command Register [HEX]
    FR = Features Register [HEX]
    SC = Sector Count Register [HEX]
    SN = Sector Number Register [HEX]
    CL = Cylinder Low Register [HEX]
    CH = Cylinder High Register [HEX]
    DH = Device/Head Register [HEX]
    DC = Device Command Register [HEX]
    ER = Error register [HEX]
    ST = Status register [HEX]
Powered_Up_Time is measured from power on, and printed as
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,
SS=sec, and sss=millisec. It "wraps" after 49.710 days.

Error 749 occurred at disk power-on lifetime: 6972 hours (290 days + 12 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  40 51 00 44 cb 53 40  Error: UNC at LBA = 0x0053cb44 = 5491524

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  60 40 10 a6 4e 58 01 08      00:16:23.812  READ FPDMA QUEUED
  60 08 10 9e 32 5b 00 08      00:16:17.646  READ FPDMA QUEUED
  60 08 10 9e 32 5b 00 08      00:16:17.645  READ FPDMA QUEUED
  ef 02 00 00 00 00 00 08      00:16:17.645  SET FEATURES [Enable write cache]
  60 08 10 9e 32 5b 00 08      00:16:11.412  READ FPDMA QUEUED

Error 748 occurred at disk power-on lifetime: 6972 hours (290 days + 12 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  40 51 00 44 cb 53 40  Error: UNC at LBA = 0x0053cb44 = 5491524

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  60 08 10 9e 32 5b 00 08      00:16:11.412  READ FPDMA QUEUED
  60 08 10 9e 32 5b 00 08      00:16:11.412  READ FPDMA QUEUED
  ef 02 00 00 00 00 00 08      00:16:11.412  SET FEATURES [Enable write cache]
  60 00 30 1e cb 53 06 08      00:16:05.199  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:16:05.180  READ FPDMA QUEUED

Error 747 occurred at disk power-on lifetime: 6972 hours (290 days + 12 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  40 51 00 44 cb 53 40  Error: UNC at LBA = 0x0053cb44 = 5491524

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  60 00 30 1e cb 53 06 08      00:16:05.199  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:16:05.180  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:16:05.178  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:16:05.178  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:16:05.178  READ FPDMA QUEUED

Error 746 occurred at disk power-on lifetime: 6972 hours (290 days + 12 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  40 51 00 44 cb 53 40  Error: UNC at LBA = 0x0053cb44 = 5491524

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  60 00 30 1e cb 53 06 08      00:15:58.945  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:15:58.945  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:15:58.945  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:15:58.945  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:15:58.944  READ FPDMA QUEUED

Error 745 occurred at disk power-on lifetime: 6972 hours (290 days + 12 hours)
  When the command that caused the error occurred, the device was active or idle.

  After command completion occurred, registers were:
  ER ST SC SN CL CH DH
  -- -- -- -- -- -- --
  40 51 00 44 cb 53 40  Error: UNC at LBA = 0x0053cb44 = 5491524

  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  60 00 30 1e cb 53 06 08      00:15:52.727  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:15:52.727  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:15:52.727  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:15:52.727  READ FPDMA QUEUED
  60 00 30 1e cb 53 06 08      00:15:52.726  READ FPDMA QUEUED

SMART Self-test log structure revision number 1
No self-tests have been logged.  [To run self-tests, use: smartctl -t]


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.

    

Answer 1

Faça a substituição, se puder.

Por outro lado, estes são 'apenas' erros de leitura que não são tão ruins assim. Se você escrever para esse setor, só poderá ter certeza se tem defeitos.

Eu executaria o utilitário de fornecedores para verificar (eles também executam testes inteligentes) se tiver problemas. Eles geralmente fazem CDs de boot disponíveis.

Você pode e deve executar um autoteste que pode ser feito a partir do Linux, emitindo

smartctl -t long /dev/your-device

aguarde algumas horas (mostrará uma estimativa). Em seguida, verifique novamente com

smartctl -a /dev/your-device

Se ele diz Completed without errors , você está bem. Se não, vá para o utilitário de fornecedores para verificar a unidade.

    

Answer 2

Os erros de leitura podem ser causados por algo tão simples quanto a perda de energia durante uma operação de gravação. Sozinho, eles não sugerem problemas de hardware na unidade.