Currently unreadable (pending) sectors

[pbo10]

Hi

I'm hoping to get some advice as I don't want to get something wrong and lose any data here. I got a notification a couple of days ago saying "Device: /dev/da5 [SAT], 16 Currently unreadable (pending) sectors". The first thing I did was search the forums etc and ran short and long smart tests on the drive which came back as follows:

Show : Smart test

Code:

root@freenas[~]# smartctl -a /dev/da5
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 WD80EFZX-68UW8N0
Serial Number:    R6H0EZDY
LU WWN Device Id: 5 000cca 263ce4bfc
Firmware Version: 83.H0A83
User Capacity:    8,001,563,222,016 bytes [8.00 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-2, ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Mon Mar 25 16:41:01 2019 GMT
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:  (0x82) Offline data collection activity
                                        was completed without error.
                                        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:                (  101) 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:        (   2) minutes.
Extended self-test routine
recommended polling time:        (1384) 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   132   132   054    Pre-fail  Offline      -       112
  3 Spin_Up_Time            0x0007   148   148   024    Pre-fail  Always       -       437 (Average 450)
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       10
  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   140   140   020    Pre-fail  Offline      -       15
  9 Power_On_Hours          0x0012   100   100   000    Old_age   Always       -       3087
 10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       10
 22 Helium_Level            0x0023   100   100   025    Pre-fail  Always       -       100
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       136
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       136
194 Temperature_Celsius     0x0002   171   171   000    Old_age   Always       -       38 (Min/Max 25/43)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       16
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
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%      3071         -
# 2  Extended offline    Completed without error       00%      3061         -
# 3  Short offline       Completed without error       00%      3039         -

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.

Which I think indicates the drive should be fine since the test is completing without error and it looks clear to me apart from those 16 sectors. So I looked around further and found a few posts mentioning it may be a fairly common issue with the WD Red drives and it's just a false alarm which could probably be reset by removing it and doing a format.

So that's fine, I can do that to clear the alert, however more concerning to me was that while going through all the troubleshooting I noticed in the Freenas GUI my pool percentages being used are displayed incorrectly:

When I first saw that I thought both my pools had lost all the data! However looking again clearly the data total seems correct but the percentages are off.

Is this somehow related to my drive error or is this some completely unrelated and unimportant issue with the GUI that I just happened to notice at the same time?

I've checked files at random on the drives and everything seems to be fine, at this point though I'm unsure whether to run a scrub to verify all the data or remove the drive with the alert format it and replace it to hopefully clear the alert.

I don't want to do anything to make my problems worse though if there's really something strange going on in my system.

 

[PhiloEpisteme]

Which I think indicates the drive should be fine since the test is completing without error and it looks clear to me apart from those 16 sectors.

The tests may "pass" but pending or reallocated sectors indicates that some of your sectors have gone bad and the drive took action to use spare sectors. If you can return the drive on warranty you may want to do that.

it may be a fairly common issue with the WD Red drives and it's just a false alarm which could probably be reset by removing it and doing a format.

I don't know anything about that. If you're confident it is a false alarm you may try reformatting the drive. But, maybe you're safer returning the drive under warranty if you can?

Is this somehow related to my drive error or is this some completely unrelated and unimportant issue with the GUI that I just happened to notice at the same time?

I think to get better answers about the percentage reporting you may want to post more details about your system. See the forum guidelines for the types of information folks look for.

 

[Johnnie Black]

Is this somehow related to my drive error or is this some completely unrelated and unimportant issue with the GUI that I just happened to notice at the same time?

Unrelated.

it may be a fairly common issue with the WD Red drives

It's fairly common with WD drives in general, as long as the SMART extended test isn't failing the disk is fine, but keep an eye on it.

 

[pbo10]

Thanks both. I think I'll swap the HDD out with a spare initially and then try to clear the SMART errors on this drive by formatting it etc. Then once all the drives are sorted I'll look into the strange issue with the percentages on the GUI being incorrect and post in the right forum for that later on.

All the data seems to be fine so far, so hopefully neither of these issues is anything major.