smartd: ATA error count increased from 0 to 1

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I noticed this in /var/log/messages today:

Jul 30 13:25:21 knew kernel: (ada0:ata0:0:0:0): READ_DMA48. ACB: 25 00 b0 51 95 40 68 00 00 00 40 00
Jul 30 13:25:21 knew kernel: (ada0:ata0:0:0:0): CAM status: ATA Status Error
Jul 30 13:25:21 knew kernel: (ada0:ata0:0:0:0): ATA status: 51 (DRDY SERV ERR), error: 40 (UNC )
Jul 30 13:25:21 knew kernel: (ada0:ata0:0:0:0): RES: 51 40 b8 51 95 68 68 00 00 38 00
Jul 30 13:25:21 knew kernel: (ada0:ata0:0:0:0): Retrying command
Jul 30 13:26:22 knew smartd[743]: Device: /dev/ada0, ATA error count increased from 0 to 1

I initiated a long test via smartctl, then had a look at what I could see:

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[dan@knew:~] $ sudo smartctl -a /dev/ada0
smartctl 6.4 2015-06-04 r4109 [FreeBSD 9.3-RELEASE-p21 amd64] (local build)
Copyright (C) 2002-15, Bruce Allen, Christian Franke, www.smartmontools.org
 
=== START OF INFORMATION SECTION ===
Model Family:     Toshiba 3.5" DT01ACA... Desktop HDD
Device Model:     TOSHIBA DT01ACA300
Serial Number:    Z2T4KGYAS
LU WWN Device Id: 5 000039 ff4c2131c
Firmware Version: MX6OABB0
User Capacity:    3,000,592,982,016 bytes [3.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Thu Jul 30 14:14:56 2015 UTC
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:  (0x85) Offline data collection activity
                    was aborted by an interrupting command from host.
                    Auto Offline Data Collection: Enabled.
Self-test execution status:      ( 249) Self-test routine in progress...
                    90% of test remaining.
Total time to complete Offline
data collection:        (25234) seconds.
Offline data collection
capabilities:            (0x5b) SMART execute Offline immediate.
                    Auto Offline data collection on/off support.
                    Suspend Offline collection upon new
                    command.
                    Offline surface scan supported.
                    Self-test supported.
                    No 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:    (   1) minutes.
Extended self-test routine
recommended polling time:    ( 421) minutes.
SCT capabilities:          (0x003d) 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     0x000b   086   086   016    Pre-fail  Always       -       11010078
  2 Throughput_Performance  0x0005   138   138   054    Pre-fail  Offline      -       76
  3 Spin_Up_Time            0x0007   253   253   024    Pre-fail  Always       -       283 (Average 81)
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       50
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   124   124   020    Pre-fail  Offline      -       33
  9 Power_On_Hours          0x0012   098   098   000    Old_age   Always       -       17693
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       30
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       51
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       51
194 Temperature_Celsius     0x0002   162   162   000    Old_age   Always       -       37 (Min/Max 18/46)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       0
 
SMART Error Log Version: 1
ATA Error Count: 1
    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 1 occurred at disk power-on lifetime: 17692 hours (737 days + 4 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 38 b8 51 95 08  Error: UNC 56 sectors at LBA = 0x089551b8 = 144003512
 
  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  25 00 40 b0 51 95 40 00   4d+03:12:47.823  READ DMA EXT
  25 00 78 38 51 95 40 00   4d+03:12:47.822  READ DMA EXT
  25 00 10 28 51 95 40 00   4d+03:12:47.822  READ DMA EXT
  25 00 10 18 51 95 40 00   4d+03:12:47.822  READ DMA EXT
  25 00 10 08 51 95 40 00   4d+03:12:47.822  READ DMA EXT
 
SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Interrupted (host reset)      20%     17651         -
 
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.
 
[dan@knew:~] $

After the long test eventually ran and completed, I found the following information.

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$ sudo smartctl -a  /dev/ada0
smartctl 6.4 2015-06-04 r4109 [FreeBSD 9.3-RELEASE-p21 amd64] (local build)
Copyright (C) 2002-15, Bruce Allen, Christian Franke, www.smartmontools.org
 
=== START OF INFORMATION SECTION ===
Model Family:     Toshiba 3.5" DT01ACA... Desktop HDD
Device Model:     TOSHIBA DT01ACA300
Serial Number:    Z2T4KGYAS
LU WWN Device Id: 5 000039 ff4c2131c
Firmware Version: MX6OABB0
User Capacity:    3,000,592,982,016 bytes [3.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Fri Jul 31 12:24:48 2015 UTC
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:  (0x85) Offline data collection activity
                    was aborted 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:        (25234) seconds.
Offline data collection
capabilities:            (0x5b) SMART execute Offline immediate.
                    Auto Offline data collection on/off support.
                    Suspend Offline collection upon new
                    command.
                    Offline surface scan supported.
                    Self-test supported.
                    No 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:    (   1) minutes.
Extended self-test routine
recommended polling time:    ( 421) minutes.
SCT capabilities:          (0x003d) 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     0x000b   100   100   016    Pre-fail  Always       -       0
  2 Throughput_Performance  0x0005   138   138   054    Pre-fail  Offline      -       76
  3 Spin_Up_Time            0x0007   253   253   024    Pre-fail  Always       -       283 (Average 81)
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       50
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail  Always       -       0
  8 Seek_Time_Performance   0x0005   124   124   020    Pre-fail  Offline      -       33
  9 Power_On_Hours          0x0012   098   098   000    Old_age   Always       -       17715
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       30
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       52
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       52
194 Temperature_Celsius     0x0002   153   153   000    Old_age   Always       -       39 (Min/Max 18/46)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0008   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x000a   200   200   000    Old_age   Always       -       0
 
SMART Error Log Version: 1
ATA Error Count: 1
    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 1 occurred at disk power-on lifetime: 17692 hours (737 days + 4 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 38 b8 51 95 08  Error: UNC 56 sectors at LBA = 0x089551b8 = 144003512
 
  Commands leading to the command that caused the error were:
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name
  -- -- -- -- -- -- -- --  ----------------  --------------------
  25 00 40 b0 51 95 40 00   4d+03:12:47.823  READ DMA EXT
  25 00 78 38 51 95 40 00   4d+03:12:47.822  READ DMA EXT
  25 00 10 28 51 95 40 00   4d+03:12:47.822  READ DMA EXT
  25 00 10 18 51 95 40 00   4d+03:12:47.822  READ DMA EXT
  25 00 10 08 51 95 40 00   4d+03:12:47.822  READ DMA EXT
 
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%     17707         -
# 2  Extended offline    Aborted by host               90%     17694         -
# 3  Extended offline    Interrupted (host reset)      20%     17651         -
 
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.
 
[dan@knew:~] $

For now, I think I’ll ignore this error. Wise? Foolish?

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