Error Device has offline unreadable and uncorrectable sectors

FreeNAS-LinuxUser · Oct 2, 2021

After an electric short in my house the NAS a HP ProLiant MicroServer Gen8, didn't boot anymore. After installing a display and keyboard it worked again. Now in the GUI of FreeNAS-11.3-U5 I have three new error messages:

Code:

CRITICAL
Device: /dev/ada3, 16 Currently unreadable (pending) sectors.
Wed, 15 Sep 2021 05:13:01 AM (Europe/Berlin)

and

Code:

CRITICAL
Device: /dev/ada3, 16 Offline uncorrectable sectors.
Wed, 15 Sep 2021 05:13:01 AM (Europe/Berlin)

and

Code:

CRITICAL
Device: /dev/ada3, Self-Test Log error count increased from 0 to 1.
Fri, 24 Sep 2021 08:51:11 AM (Europe/Berlin)

I searched the problem and found this guide:

Code:

http://bytesandbolts.com/fixing-freenas-error-currently-unreadable-pending-sectors/

So I ssh-ed into the NAS and ran

Code:

smartctl -t long /dev/ada3

then

Code:

smartctl -a /dev/ada3

Result:

Code:

root@freenas[/]# smartctl -a /dev/ada3
smartctl 7.0 2018-12-30 r4883 [FreeBSD 11.3-RELEASE-p14 amd64] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Seagate Archive HDD
Device Model:     ST8000AS0002-1NA17Z
Serial Number:    Z8407BHM
LU WWN Device Id: 5 000c50 07bbbb83a
Firmware Version: AR13
User Capacity:    8,001,563,222,016 bytes [8.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5980 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Wed Sep 29 14:58:10 2021 CEST
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:      ( 114)    The previous self-test completed having
                    the read element of the test failed.
Total time to complete Offline
data collection:         (    0) 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:      (   1) minutes.
Extended self-test routine
recommended polling time:      ( 946) minutes.
Conveyance self-test routine
recommended polling time:      (   2) minutes.
SCT capabilities:            (0x30a5)    SCT Status supported.
                    SCT Data Table supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000f   118   099   006    Pre-fail  Always       -       176851216
  3 Spin_Up_Time            0x0003   090   090   000    Pre-fail  Always       -       0
  4 Start_Stop_Count        0x0032   061   061   020    Old_age   Always       -       40050
  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000f   064   051   030    Pre-fail  Always       -       7631679121406
  9 Power_On_Hours          0x0032   053   053   000    Old_age   Always       -       41611
 10 Spin_Retry_Count        0x0013   100   100   097    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   020    Old_age   Always       -       152
183 Runtime_Bad_Block       0x0032   100   100   000    Old_age   Always       -       0
184 End-to-End_Error        0x0032   100   100   099    Old_age   Always       -       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
188 Command_Timeout         0x0032   100   098   000    Old_age   Always       -       12885098499
189 High_Fly_Writes         0x003a   100   100   000    Old_age   Always       -       0
190 Airflow_Temperature_Cel 0x0022   065   058   045    Old_age   Always       -       35 (Min/Max 34/39)
191 G-Sense_Error_Rate      0x0032   100   100   000    Old_age   Always       -       0
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       1667
193 Load_Cycle_Count        0x0032   079   079   000    Old_age   Always       -       43870
194 Temperature_Celsius     0x0022   035   042   000    Old_age   Always       -       35 (0 19 0 0 0)
195 Hardware_ECC_Recovered  0x001a   118   099   000    Old_age   Always       -       176851216
197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always       -       16
198 Offline_Uncorrectable   0x0010   100   100   000    Old_age   Offline      -       16
199 UDMA_CRC_Error_Count    0x003e   200   200   000    Old_age   Always       -       0
240 Head_Flying_Hours       0x0000   100   253   000    Old_age   Offline      -       41085 (221 183 0)
241 Total_LBAs_Written      0x0000   100   253   000    Old_age   Offline      -       63053642690
242 Total_LBAs_Read         0x0000   100   253   000    Old_age   Offline      -       525080289507

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  Extended offline    Completed: read failure       20%     41523         -
# 2  Extended offline    Aborted by host               20%     41512         -
# 3  Extended offline    Completed: read failure       20%     41485         -
# 4  Short offline       Completed without error       00%     26773         -
# 5  Short offline       Completed without error       00%     26772         -
# 6  Short offline       Completed without error       00%     26771         -
# 7  Short offline       Completed without error       00%     26770         -
# 8  Short offline       Completed without error       00%     26769         -
# 9  Short offline       Completed without error       00%     26768         -
#10  Short offline       Completed without error       00%     26767         -
#11  Short offline       Completed without error       00%     26766         -
#12  Short offline       Completed without error       00%     26765         -
#13  Short offline       Completed without error       00%     26764         -
#14  Short offline       Completed without error       00%     26763         -
#15  Short offline       Completed without error       00%     26762         -
#16  Short offline       Completed without error       00%     26761         -
#17  Short offline       Completed without error       00%     26760         -
#18  Short offline       Completed without error       00%     26760         -
#19  Short offline       Completed without error       00%     26758         -
#20  Short offline       Completed without error       00%     26757         -
#21  Short offline       Completed without error       00%     26756         -

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.

Since that did not return an "LBA_of_first_error" like in the guide i dont know how to proceed further.

If it helps I did the same procedure with the boot drive. An SSD inside an USB-case.

Code:

root@freenas[/]# smartctl -a /dev/da0
smartctl 7.0 2018-12-30 r4883 [FreeBSD 11.3-RELEASE-p14 amd64] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Device Model:     LITEON IT LST-32S9G-HP
Serial Number:    002443120486
LU WWN Device Id: 5 002303 1002ff384
Firmware Version: 9401
User Capacity:    32,017,047,552 bytes [32.0 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    Solid State Device
Form Factor:      < 1.8 inches
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   ACS-3 (minor revision not indicated)
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Wed Sep 29 17:16:48 2021 CEST
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
See vendor-specific Attribute list for marginal Attributes.

General SMART Values:
Offline data collection status:  (0x02)    Offline data collection activity
                    was completed without error.
                    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:         (    0) seconds.
Offline data collection
capabilities:              (0x51) SMART execute Offline immediate.
                    No Auto Offline data collection support.
                    Suspend Offline collection upon new
                    command.
                    No 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:      (  35) 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: 32
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   100   100   000    Pre-fail  Always       -       0
  5 Reallocated_Sector_Ct   0x0033   100   100   010    Pre-fail  Always       -       0
  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       2231
 11 Unknown_SSD_Attribute   0x0022   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       984
170 Unknown_Attribute       0x0033   100   100   005    Pre-fail  Always       -       0
171 Unknown_Attribute       0x0022   100   100   000    Old_age   Always       -       0
172 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0
173 Unknown_Attribute       0x0033   100   100   005    Pre-fail  Always       -       324
174 Unknown_Attribute       0x0022   100   100   000    Old_age   Always       -       88
183 Runtime_Bad_Block       0x0032   100   100   000    Old_age   Always       -       0
184 End-to-End_Error        0x0033   100   100   097    Pre-fail  Always       -       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
188 Command_Timeout         0x0032   100   100   000    Old_age   Always       -       2769
190 Airflow_Temperature_Cel 0x0022   055   055   055    Old_age   Always   FAILING_NOW 45
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0022   100   100   000    Old_age   Always       -       0
241 Total_LBAs_Written      0x0003   100   100   000    Pre-fail  Always       -       196366
242 Total_LBAs_Read         0x0003   100   100   000    Pre-fail  Always       -       269512

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  Extended offline    Completed without error       00%       183         -
# 2  Short offline       Completed without error       00%       176         -

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.

Any help is appreciated.

Pitfrr · Oct 2, 2021

Hello,

You might want to RMA the drive if still under warranty, I guess "Offline uncorrectable" is valid reason for RMA (you might confirm with customer support, maybe you'll have to run some Seagate diagnostic tool before or so.).

There are some interesting values, I'm not sure how to interpret them (don't know Seagate drives that well):
#1 has the same value as #195
#7 and #188 are very high... but depending on how it is interpreted by Seagate...

You also should schedule regular SMART tests... there are some short tests until around 26000 hours and then nothing until 41000 hours, that's not good, well it makes it difficult to track potential issues (and having a short test every hour is maybe overkill...).

By the way, are you aware that your drive seems to be an SMR drive (at least in the list of SMR drives)?

FreeNAS-LinuxUser · Oct 2, 2021

Thank you. The drive is several years old so RMA is not an option. If replacing than on my own cost. Yes I know it is SMR. At the time it was the only affordable drive of that size. Isn't smart done regularly by FreeNAS? If not how did it detect an error and messaged me if not by smart?
The pool on that drive and its mirror is encrypted. Can I savely mount it and save the data? Or is it recommended to just replace the drive with a new one and resilver it in its encrypted state?

Pitfrr · Oct 2, 2021

SMART tests need to be scheduled manually (not sure about version 11 but I think in TrueNAS there are per default some automated tests... Anyway, you have to make sure those are run regularly.).
SMART is also running as a process in the background (if activated in the services) so as soon as a drive reports an error (like an offline sector), FreeNAS will know about it. But since the SMART tests are not running, you won't have anticipated warning.
There is a difference between the SMART service and the SMART tests: it is not because the SMART service is active that the tests will be run...

In any case, make sure you have a good backup of your data and then proceed with replacing the drive. I would follow the user manual, it is described how to proceed with an encrypted pool.

jgreco · Oct 2, 2021

FreeNAS-LinuxUser said:
Yes I know it is SMR. At the time it was the only affordable drive of that size.

Unfortunate. SMR drives will work sorta-okay right up until you're at the point where you are, where some substantial I/O needs to be done, which tends to be very hard on SMR drives, sometimes killing them.

Isn't smart done regularly by FreeNAS?

If you set it up.

If not how did it detect an error and messaged me if not by smart?

The old fashioned way, by checksumming your data and detecting errors. That's what ZFS is all about.

Ericloewe · Oct 2, 2021

Do note that SMART monitoring is always on. If the disk comes across something, it will report it (manufacturer shenanigans aside).
That is different from running SMART tests, which explicitly test the disk and must be scheduled.

Important Announcement for the TrueNAS Community.

Error Device has offline unreadable and uncorrectable sectors

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