So i've been trying to figure this out and sometimes it stays away for a week or so, sometimes it's instantly back. Basically it's an alert i get.
Boot pool status is ONLINE: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected..
So i went looking in other topics where i found someone recommending to zpool status -v, which gives me the following result.
Now i can see that one of my SSD's in the freenas boot mirror has a 4 under checksum and according to other topics this can be caused by SMART data of the drives. 1 of the SSD's is brandnew and the other one is the first SSD i ever owned but since it was only 120gb i didn't use it anymore (still worked fine for me).
Next someone said you need the device and run smartctl -a /dev/ada1 . Which in my case is ada1 and gave me the following:
And that points me to my brandnew wd green 120gb ssd. I hope i provided enough information so that you can help me figure out why i keep getting that notification about the unrecoverable error.
	
		
			
		
		
	
			
			Boot pool status is ONLINE: One or more devices has experienced an unrecoverable error. An attempt was made to correct the error. Applications are unaffected..
So i went looking in other topics where i found someone recommending to zpool status -v, which gives me the following result.
Code:
 state: ONLINE
  scan: scrub repaired 0 in 0 days 08:00:16 with 0 errors on Sun Jun 28 08:00:16 2020
config:
        NAME                                            STATE     READ WRITE CKSUM
        PoolA                                          ONLINE       0     0 0
          raidz2-0                                      ONLINE       0     0 0
            gptid/8917829c-7dc0-11ea-a619-7824af43cfa9  ONLINE       0     0 0
            gptid/716454bd-9787-11ea-a381-7824af43cfa9  ONLINE       0     0 0
            gptid/898dbed0-7dc0-11ea-a619-7824af43cfa9  ONLINE       0     0 0
            gptid/897ceb83-7dc0-11ea-a619-7824af43cfa9  ONLINE       0     0 0
            gptid/899c4e6c-7dc0-11ea-a619-7824af43cfa9  ONLINE       0     0 0
            gptid/8fa6b8ea-9787-11ea-a381-7824af43cfa9  ONLINE       0     0 0
errors: No known data errors
  pool: freenas-boot
 state: ONLINE
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
   see: http://illumos.org/msg/ZFS-8000-9P
  scan: scrub repaired 4K in 0 days 00:05:15 with 0 errors on Fri Jun 26 03:50:15 2020
config:
        NAME        STATE     READ WRITE CKSUM
        freenas-boot  ONLINE       0     0     0
          mirror-0  ONLINE       0     0     0
            ada0p2  ONLINE       0     0     0  block size: 512B configured, 4096B native
            ada1p2  ONLINE       0     0     4
errors: No known data errors
  pool: ssd
 state: ONLINE
  scan: scrub repaired 144K in 0 days 00:32:09 with 0 errors on Sun Jun 21 00:32:09 2020
config:
        NAME                                            STATE     READ WRITE CKSUM
        ssd                                             ONLINE       0     0 0
          mirror-0                                      ONLINE       0     0 0
Now i can see that one of my SSD's in the freenas boot mirror has a 4 under checksum and according to other topics this can be caused by SMART data of the drives. 1 of the SSD's is brandnew and the other one is the first SSD i ever owned but since it was only 120gb i didn't use it anymore (still worked fine for me).
Next someone said you need the device and run smartctl -a /dev/ada1 . Which in my case is ada1 and gave me the following:
Code:
/dev/ada1p2: Unable to detect device type
Please specify device type with the -d option.
Use smartctl -h to get a usage summary
root@Brisingr[~]# smartctl -a /dev/ada1
smartctl 7.0 2018-12-30 r4883 [FreeBSD 11.3-RELEASE-p9 amd64] (local build)
Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family:     WD Blue / Red / Green SSDs
Device Model:     WDC WDS120G2G0A-00JH30
Serial Number:    2003BQ461911
LU WWN Device Id: 5 001b44 4a830af06
Firmware Version: UE510000
User Capacity:    120,040,980,480 bytes [120 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    Solid State Device
Form Factor:      2.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2 T13/2015-D revision 3
SATA Version is:  SATA 3.2, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Tue Jun 30 21:56:14 2020 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:  (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:                (  120) seconds.
Offline data collection
capabilities:                    (0x15) SMART execute Offline immediate.
                                        No Auto Offline data collection support.
                                        Abort Offline collection upon new
                                        command.
                                        No Offline surface scan supported.
                                        Self-test supported.
                                        No Conveyance Self-test supported.
                                        No 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:        (  21) minutes.
SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  5 Reallocated_Sector_Ct   0x0032   100   100   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       1929
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       15
165 Block_Erase_Count       0x0032   100   100   000    Old_age   Always       -       379
166 Minimum_PE_Cycles_TLC   0x0032   100   100   ---    Old_age   Always       -       2
167 Max_Bad_Blocks_per_Die  0x0032   100   100   ---    Old_age   Always       -       0
168 Maximum_PE_Cycles_TLC   0x0032   100   100   ---    Old_age   Always       -       5
169 Total_Bad_Blocks        0x0032   100   100   ---    Old_age   Always       -       225
170 Grown_Bad_Blocks        0x0032   100   100   ---    Old_age   Always       -       0
171 Program_Fail_Count      0x0032   100   100   000    Old_age   Always       -       0
172 Erase_Fail_Count        0x0032   100   100   000    Old_age   Always       -       0
173 Average_PE_Cycles_TLC   0x0032   100   100   000    Old_age   Always       -       2
174 Unexpected_Power_Loss   0x0032   100   100   000    Old_age   Always       -       10
184 End-to-End_Error        0x0032   100   100   ---    Old_age   Always       -       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
188 Command_Timeout         0x0032   100   100   ---    Old_age   Always       -       0
194 Temperature_Celsius     0x0022   065   051   000    Old_age   Always       -       35 (Min/Max 18/51)
199 UDMA_CRC_Error_Count    0x0032   100   100   ---    Old_age   Always       -       0
230 Media_Wearout_Indicator 0x0032   100   100   000    Old_age   Always       -       0x010800280108
232 Available_Reservd_Space 0x0033   100   100   005    Pre-fail  Always       -       100
233 NAND_GB_Written_TLC     0x0032   100   100   ---    Old_age   Always       -       262
234 NAND_GB_Written_SLC     0x0032   100   100   000    Old_age   Always       -       2115
241 Host_Writes_GiB         0x0030   100   100   000    Old_age   Offline      -       777
242 Host_Reads_GiB          0x0030   100   100   000    Old_age   Offline      -       37
244 Temp_Throttle_Status    0x0032   000   100   ---    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%      1913         -
# 2  Short offline       Completed without error       00%      1889         -
# 3  Extended offline    Completed without error       00%      1860         -
# 4  Short offline       Completed without error       00%      1841         -
# 5  Short offline       Completed without error       00%      1817         -
# 6  Short offline       Completed without error       00%      1794         -
# 7  Short offline       Completed without error       00%      1770         -
# 8  Short offline       Completed without error       00%      1745         -
# 9  Short offline       Completed without error       00%      1721         -
#10  Short offline       Completed without error       00%      1673         -
#11  Short offline       Completed without error       00%      1649         -
#12  Short offline       Completed without error       00%      1625         -
#13  Short offline       Completed without error       00%      1601      -
#14  Short offline       Completed without error       00%      1577         -
#15  Extended offline    Completed without error       00%      1524         -
#16  Extended offline    Self-test routine in progress 40%      1524         -
Selective Self-tests/Logging not supported
And that points me to my brandnew wd green 120gb ssd. I hope i provided enough information so that you can help me figure out why i keep getting that notification about the unrecoverable error.