SMART- extended offline read failure -Fix or Replace?

endnot

Dabbler
Joined
Feb 6, 2019
Messages
33
Received a critical alert "Device: /dev/ada3, Self-Test Log error count increased from 0 to 1." While searching I found this blog post, Fixing FreeNAS error: Currently unreadable (pending) sectors, that indicates it will fix the disk. I think that I understand the steps well enough to follow them, I do not know if this is a reasonable course of action. It appears that the error is always the same block so maybe I could dd the single sector and repair the the disk.
If I repair the disk and the error is no longer reported, should I consider the disk safe? Or should I replace the disk and be done with it because it is going to fail soon.

I have a single 5 disk pool, and this is the only WD drive the others are Seagates.

TIA.


Code:
root@freenas[~]# smartctl -a /dev/ada3
smartctl 7.2 2020-12-30 r5155 [FreeBSD 12.2-RELEASE-p12 amd64] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD40EFRX-68N32N0
Serial Number:    WD-WCC7K5ZJNCNC
LU WWN Device Id: 5 0014ee 2ba96fd5c
Firmware Version: 82.00A82
User Capacity:    4,000,787,030,016 bytes [4.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5400 rpm
Form Factor:      3.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-3 T13/2161-D revision 5
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Sat Oct  8 11:06:43 2022 CDT
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:  (0x00) Offline data collection activity
                                        was never started.
                                        Auto Offline Data Collection: Disabled.
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:                (44640) 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:        ( 473) minutes.
Conveyance self-test routine
recommended polling time:        (   5) minutes.
SCT capabilities:              (0x303d) 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     0x002f   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   237   163   021    Pre-fail  Always       -       3150
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       113
  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   058   058   000    Old_age   Always       -       30911
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       113
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       96
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       1013
194 Temperature_Celsius     0x0022   121   099   000    Old_age   Always       -       29
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   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  Short offline       Completed without error       00%     30899         -
# 2  Extended offline    Completed: read failure       90%     30732         126481952
# 3  Short offline       Completed without error       00%     30731         -
# 4  Short offline       Completed without error       00%     30563         -
# 5  Short offline       Completed without error       00%     30395         -
# 6  Short offline       Completed without error       00%     30227         -
# 7  Short offline       Completed without error       00%     30060         -
# 8  Extended offline    Completed: read failure       90%     30013         126481952
# 9  Short offline       Completed without error       00%     29892         -
#10  Short offline       Completed without error       00%     29724         -
#11  Short offline       Completed without error       00%     29556         -
#12  Short offline       Completed without error       00%     29388         -
#13  Extended offline    Completed: read failure       90%     29269         126481952
#14  Short offline       Completed without error       00%     29220         -
#15  Short offline       Completed without error       00%     29053         -
#16  Short offline       Completed without error       00%     28885         -
#17  Short offline       Completed without error       00%     28717         -
#18  Short offline       Completed without error       00%     28549         -
#19  Extended offline    Completed: read failure       90%     28526         126481952
#20  Short offline       Completed without error       00%     28381         -
#21  Short offline       Completed without error       00%     28214         -

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.
 
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