Should I replace this drive?

[ninjai]

For a few months now I've received SMART alerts on one of my disks. Not sure how to pull the rest of the logs off freeNAS, but here's what's not been dismissed yet:
Device: /dev/ada5, 1 Currently unreadable (pending) sectors
Sun, 08 Dec 2019 14:40:10 GMT Dismiss

info
Device: /dev/ada5, Self-Test Log error count increased from 5 to 6
Tue, 26 Nov 2019 08:41:23 GMT Dismiss

These are not the only errors I've received. Here's the SMART readout:

Code:

@freenas ~]$ sudo smartctl -a /dev/ada5
Password:
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-WCC4N6UYET37
LU WWN Device Id: 5 0014ee 20bb20b32
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:    Sun Dec  8 08:46:35 2019 PST
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:                (40500) 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:        ( 406) 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   200   200   051    Pre-fail  Always       -       19
  3 Spin_Up_Time            0x0027   187   177   021    Pre-fail  Always       -       5650
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       52
  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   047   047   000    Old_age   Always       -       39134
 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       -       51
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       21
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       864
194 Temperature_Celsius     0x0022   122   110   000    Old_age   Always       -       28
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   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   100   253   000    Old_age   Offline      -       0

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%     39126         -
# 2  Short offline       Completed without error       00%     39101         -
# 3  Short offline       Completed without error       00%     39077         -
# 4  Short offline       Completed without error       00%     39053         -
# 5  Short offline       Completed without error       00%     39029         -
# 6  Short offline       Completed without error       00%     39005         -
# 7  Short offline       Completed: read failure       40%     38981         4211632
# 8  Short offline       Completed without error       00%     38957         -
# 9  Short offline       Completed without error       00%     38933         -
#10  Short offline       Completed without error       00%     38909         -
#11  Short offline       Completed without error       00%     38885         -
#12  Short offline       Completed without error       00%     38861         -
#13  Short offline       Completed without error       00%     38849         -
#14  Short offline       Completed: read failure       50%     38837         4211632
#15  Short offline       Completed without error       00%     38790         -
#16  Short offline       Completed without error       00%     38767         -
#17  Short offline       Completed without error       00%     38742         -
#18  Short offline       Completed without error       00%     38718         -
#19  Short offline       Completed: read failure       50%     38694         4211632
#20  Short offline       Completed without error       00%     38670         -
#21  Short offline       Completed without error       00%     38646         -

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.

 

[G8One2]

Yes

 

[Chris Moore]

Western Digital is a little funny about how they report errors. That pending sector may get reallocated the next time data is written to it. This tends to indicate that the drive is beginning to go bad. If it is still under warranty, you might want to send it in for replacement and if it is not, you might want to plan on buying a replacement drive and maybe even a spare. I try to keep a few spare drives available for doing replacements. I just put a full set of new drives in my system about a year ago, so I have not needed to do a replacement in a while, but I did that because all my drives were over five years old and I was having to replace a drive every month for a little while. As your drives get older, they may start to fail more frequently.

 

[Chris Moore]

PS. What level of redundancy do you have for your pool?

Here is a link to the kind of info you should share when asking questions, just so we know what you have to work with:

Forum Guidelines
https://www.ixsystems.com/community/threads/forum-guidelines.45124/

 

[ninjai]

It's RAIDZ2 so I can survive 2 dead disks. I'm running 6x WD Red 3TB. Right now my thought is to just buy the new disk and leave it to the side. If the errors get worse and more frequent I'll swap it... that's what I'm thinking anyways

 

[Chris Moore]

Do you have the system setup to run periodic SMART scans on the disks?

 

[Jailer]

Right now my thought is to just buy the new disk and leave it to the side.

A better plan would be to get that disk burned in and replace ada5. It's failed 6 smart tests, that drive is on it's way out.

 

[ninjai]

Do you have the system setup to run periodic SMART scans on the disks?

Yes I do. Short test every day, long every month.