Fixing Pending Sectors Help

[skrramit]

Hi experts!

I'm a bit of a rookie, so be gentle! I've read a few guides and other threads in here to repair my pending sectors on ada1. But following them doesnt seem to work. Can anyone help? Am I doing it correctly?

SMART says I have 26 pending sectors on ada1.

So I tried the dd method of writing to that block a few times over without success.

Code:

root@freenas:~ # dd if=/dev/zero of=/dev/ada1 bs=4096 count=1 seek=3074734 conv=noerror,sync
1+0 records in
1+0 records out
4096 bytes transferred in 0.000242 secs (16960311 bytes/sec)
root@freenas:~ # dd if=/dev/zero of=/dev/ada1 bs=4096 count=1 seek=3074735 conv=noerror,sync
1+0 records in
1+0 records out
4096 bytes transferred in 0.000242 secs (16960382 bytes/sec)
root@freenas:~ # dd if=/dev/zero of=/dev/ada1 bs=4096 count=1 seek=3074728 conv=noerror,sync
1+0 records in
1+0 records out
4096 bytes transferred in 0.000244 secs (16756805 bytes/sec)
root@freenas:~ #

It seems to write the data ok... but then I scrub the pool and still have the same pending sectors? Am I doing something wrong here?

Thanks!

Code:

root@freenas:~ # smartctl -a /dev/ada1
smartctl 6.6 2017-11-05 r4594 [FreeBSD 11.2-STABLE amd64] (local build)
Copyright (C) 2002-17, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD30EFRX-68EUZN0
Serial Number:    WD-WCC4N1URDK3N
LU WWN Device Id: 5 0014ee 2612fd041
Firmware Version: 82.00A82
User Capacity:    3,000,592,982,016 bytes [3.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5400 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2 (minor revision not indicated)
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Sat Apr 25 22:14:17 2020 AEST
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:      ( 121) The previous self-test completed having
                                        the read element of the test failed.
Total time to complete Offline
data collection:                (39600) 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:        ( 398) minutes.
Conveyance self-test routine
recommended polling time:        (   5) minutes.
SCT capabilities:              (0x703d) 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   195   195   051    Pre-fail  Always       -       56687
  3 Spin_Up_Time            0x0027   177   176   021    Pre-fail  Always       -       6133
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       48
  5 Reallocated_Sector_Ct   0x0033   171   171   140    Pre-fail  Always       -       852
  7 Seek_Error_Rate         0x002e   100   253   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   066   066   000    Old_age   Always       -       25309
 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       -       48
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       13
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       193
194 Temperature_Celsius     0x0022   119   109   000    Old_age   Always       -       31
196 Reallocated_Event_Count 0x0032   161   161   000    Old_age   Always       -       39
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       26
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: read failure       90%     25298         3074735
# 2  Extended offline    Completed: read failure       90%     25297         3074729
# 3  Extended offline    Completed: read failure       90%     25294         3074734
# 4  Extended offline    Completed: read failure       90%     25293         3074728
# 5  Short offline       Completed: read failure       60%     24739         3074728
# 6  Short offline       Completed: read failure       60%     24738         3074728
# 7  Short offline       Completed: read failure       60%     24737         3074728
# 8  Short offline       Completed: read failure       60%     24736         3074728
# 9  Short offline       Completed: read failure       60%     24735         3074728
#10  Short offline       Completed: read failure       60%     24734         3074728
#11  Short offline       Completed: read failure       60%     24733         3074728
#12  Short offline       Completed: read failure       60%     24732         3074728
#13  Short offline       Completed: read failure       50%     24731         3074728
#14  Short offline       Completed: read failure       50%     24730         3074728
#15  Short offline       Completed: read failure       50%     24729         3074728
#16  Short offline       Completed: read failure       50%     24728         3074728
#17  Short offline       Completed: read failure       50%     24727         3074728
#18  Short offline       Completed: read failure       50%     24726         3074728
#19  Short offline       Completed: read failure       40%     24725         3074728
#20  Short offline       Completed: read failure       50%     24724         3074728
#21  Short offline       Completed: read failure       50%     24723         3074728

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.

 

[danb35]

Am I doing something wrong here?

Yes, in that you aren't immediately replacing the disk. In addition to the pending sectors, it has 48 already reallocated, and it's failed every SMART self-test in its log. Replace the disk.

 

[Jailer]

That drive is toast, replace it.

 

[skrramit]

Thanks for the replies.
So can you be a bit more specific why it’s toast? I thought pending or offline sectors are fairly normal for a a HDD?

 

[skrramit]

it's failed every SMART self-test in its log.

Where does it say that sorry?

Is this bit misleading me:

Code:

SMART overall-health self-assessment test result: PASSED

 

[danb35]

Where does it say that sorry?

Try looking through the complete smartctl output you posted--I think you'll find it.

 

[Jailer]

Where does it say that sorry?

Is this bit misleading me:

Code:

SMART overall-health self-assessment test result: PASSED

Code:

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed: read failure       90%     25298         3074735
# 2  Extended offline    Completed: read failure       90%     25297         3074729
# 3  Extended offline    Completed: read failure       90%     25294         3074734
# 4  Extended offline    Completed: read failure       90%     25293         3074728
# 5  Short offline       Completed: read failure       60%     24739         3074728
# 6  Short offline       Completed: read failure       60%     24738         3074728
# 7  Short offline       Completed: read failure       60%     24737         3074728
# 8  Short offline       Completed: read failure       60%     24736         3074728
# 9  Short offline       Completed: read failure       60%     24735         3074728
#10  Short offline       Completed: read failure       60%     24734         3074728
#11  Short offline       Completed: read failure       60%     24733         3074728
#12  Short offline       Completed: read failure       60%     24732         3074728
#13  Short offline       Completed: read failure       50%     24731         3074728
#14  Short offline       Completed: read failure       50%     24730         3074728
#15  Short offline       Completed: read failure       50%     24729         3074728
#16  Short offline       Completed: read failure       50%     24728         3074728
#17  Short offline       Completed: read failure       50%     24727         3074728
#18  Short offline       Completed: read failure       50%     24726         3074728
#19  Short offline       Completed: read failure       40%     24725         3074728
#20  Short offline       Completed: read failure       50%     24724         3074728
#21  Short offline       Completed: read failure       50%     24723         3074728

 

[skrramit]

Okay to be honest not sure what I'm looking at in the smart results, but I'll take your word for it.

Given the drive is not SMR, and newer WD Reds have now been found to be SMR which don't play nice in RAID, should I avoid replacing this with an SMR 3TB WD Red and maybe go for an Seagate Ironwolf 3TB instead?

Also, I assume if I buy a larger drive e.g. 6TB I can slowly upgrade the array over time if I buy 3 x 6TB drives to rplace the current 3 x 3TB? I dont have spare SATA ports so would need to do it one by one.

 

[danb35]

Okay to be honest not sure what I'm looking at in the smart results,

The 21 lines that say "Completed: read failure" weren't a clue?

should I avoid replacing this with an SMR 3TB WD Red

I thought I'd seen in that thread that the 3TB disks were still CMR, but I haven't been following that closely. Seagate says the Ironwolf series are and will continue to be CMR, so those would be safe too.

I assume if I buy a larger drive e.g. 6TB I can slowly upgrade the array over time if I buy 3 x 6TB drives to rplace the current 3 x 3TB?

Yep:

10. Storage — FreeNAS®11.3-U2 User Guide Table of Contents

www.ixsystems.com

 

[skrramit]

The 21 lines that say "Completed: read failure" weren't a clue?

Yes but I assumed that was just the pending sectors and hence was trying to correct them with the dd writes.