checksum errors after scrub on Zpool

shackrock · Apr 5, 2013

I did a scrub on my volume yesterday, please see the results below. Particularly I am wondering about the checksum errors (81) on the one disk as shown. Does that mean I need to replace it?

I did a zpool clear and it went back to zero...

Further, FreeNAS GUI says the volume is "HEALTHY" after the zpool clear. I should have checked it before that, but I didn't...whoops...

Code:

[root@freenas] ~# zpool status

  pool: DEC2010
 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://www.sun.com/msg/ZFS-8000-9P
  scan: scrub repaired 55K in 16h1m with 0 errors on Thu Apr  4 22:45:13 2013
config:

        NAME                                            STATE     READ WRITE CKSUM
        DEC2010                                         ONLINE       0     0     0
          raidz1-0                                      ONLINE       0     0     0
            gptid/218a2962-c5d4-11e0-8fd1-0025900d25b0  ONLINE       0     0     0
            gptid/dc4978b8-ff57-11e1-88de-0025900d25b0  ONLINE       0     0    81
            gptid/22b4bd1e-c5d4-11e0-8fd1-0025900d25b0  ONLINE       0     0     0
            gptid/afb125e9-84f7-11e1-b8dd-0025900d25b0  ONLINE       0     0     0
            gptid/b3dfe402-006c-11e2-acc4-0025900d25b0  ONLINE       0     0     0
            gptid/23cc848c-c5d4-11e0-8fd1-0025900d25b0  ONLINE       0     0     0
          raidz1-1                                      ONLINE       0     0     0
            ada6p2.nop                                  ONLINE       0     0     0
            ada7p2.nop                                  ONLINE       0     0     0
            ada8p2.nop                                  ONLINE       0     0     0
            ada9p2.nop                                  ONLINE       0     0     0

errors: No known data errors

[root@freenas] ~# zpool clear DEC2010

[root@freenas] ~# zpool status

  pool: DEC2010
 state: ONLINE
  scan: scrub repaired 55K in 16h1m with 0 errors on Thu Apr  4 22:45:13 2013
config:

        NAME                                            STATE     READ WRITE CKSUM
        DEC2010                                         ONLINE       0     0     0
          raidz1-0                                      ONLINE       0     0     0
            gptid/218a2962-c5d4-11e0-8fd1-0025900d25b0  ONLINE       0     0     0
            gptid/dc4978b8-ff57-11e1-88de-0025900d25b0  ONLINE       0     0     0
            gptid/22b4bd1e-c5d4-11e0-8fd1-0025900d25b0  ONLINE       0     0     0
            gptid/afb125e9-84f7-11e1-b8dd-0025900d25b0  ONLINE       0     0     0
            gptid/b3dfe402-006c-11e2-acc4-0025900d25b0  ONLINE       0     0     0
            gptid/23cc848c-c5d4-11e0-8fd1-0025900d25b0  ONLINE       0     0     0
          raidz1-1                                      ONLINE       0     0     0
            ada6p2.nop                                  ONLINE       0     0     0
            ada7p2.nop                                  ONLINE       0     0     0
            ada8p2.nop                                  ONLINE       0     0     0
            ada9p2.nop                                  ONLINE       0     0     0

errors: No known data errors

Now, I will add that I've ran this command to find out the real /dev/ device name:

Code:

[root@freenas] ~# glabel status
                                      Name  Status  Components
gptid/218a2962-c5d4-11e0-8fd1-0025900d25b0     N/A  ada0p2
gptid/dc4978b8-ff57-11e1-88de-0025900d25b0     N/A  ada1p2
gptid/22b4bd1e-c5d4-11e0-8fd1-0025900d25b0     N/A  ada2p2
gptid/afb125e9-84f7-11e1-b8dd-0025900d25b0     N/A  ada3p2
gptid/b3dfe402-006c-11e2-acc4-0025900d25b0     N/A  ada4p2
gptid/23cc848c-c5d4-11e0-8fd1-0025900d25b0     N/A  ada5p2
                             ufs/FreeNASs3     N/A  da0s3
                             ufs/FreeNASs4     N/A  da0s4
                            ufs/FreeNASs1a     N/A  da0s1a
                    ufsid/50c8c7da3400b84f     N/A  da0s2a
                            ufs/FreeNASs2a     N/A  da0s2a

and then I have attempted to run this as follows:

Code:

smartctl -a /dev/ada1p2
smartctl 5.43 2012-06-30 r3573 [FreeBSD 8.3-RELEASE-p6 amd64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net

/dev/ada1p2: Unable to detect device type
Smartctl: please specify device type with the -d option.

Use smartctl -h to get a usage summary

It's a SATA II drive connected directly to 1 of the motherboard's SATA ports.

warri · Apr 5, 2013

Yes, the checksum errors might be indicators for a bad drive.

To see SMART details, use:

Code:

smartctl -a /dev/ada1

You tried to access smart details for a partition (ada1p2).

To run a short or long SMART test on the device, use:

Code:

smartctl -t short /dev/ada1
smartctl -t long /dev/ada1

gpsguy · Apr 5, 2013

Use: smartctl –a /dev/ada1

shackrock · Apr 5, 2013

Whoops, DUH.

Here's the Smart details right off the bat, before I ran any new tests:

Code:

[root@freenas] ~# smartctl -a /dev/ada1
smartctl 5.43 2012-06-30 r3573 [FreeBSD 8.3-RELEASE-p6 amd64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Caviar Green (Adv. Format)
Device Model:     WDC WD20EARS-00MVWB0
Serial Number:    WD-WCAZA4653360
LU WWN Device Id: 5 0014ee 2058f7e3b
Firmware Version: 51.0AB51
User Capacity:    2,000,398,934,016 bytes [2.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   8
ATA Standard is:  Exact ATA specification draft version not indicated
Local Time is:    Fri Apr  5 15:59:29 2013 EDT
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:                (37560) 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:        ( 362) minutes.
Conveyance self-test routine
recommended polling time:        (   5) minutes.
SCT capabilities:              (0x3035) SCT Status 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       -       0
  3 Spin_Up_Time            0x0027   166   164   021    Pre-fail  Always       -       6658
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       28
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   094   094   000    Old_age   Always       -       4693
 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       -       26
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       11
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       1043
194 Temperature_Celsius     0x0022   119   110   000    Old_age   Always       -       31
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   200   200   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      -       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%      4608         -
# 2  Short offline       Completed without error       00%      3870         -
# 3  Short offline       Completed without error       00%      3199         -
# 4  Short offline       Completed without error       00%      2456         -
# 5  Short offline       Completed without error       00%      1740         -
# 6  Short offline       Completed without error       00%      1020         -
# 7  Short offline       Completed without error       00%       399         -
# 8  Short offline       Completed without error       00%        20         -

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.

Now here's after a short test on the drive:

Code:

smartctl 5.43 2012-06-30 r3573 [FreeBSD 8.3-RELEASE-p6 amd64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Caviar Green (Adv. Format)
Device Model:     WDC WD20EARS-00MVWB0
Serial Number:    WD-WCAZA4653360
LU WWN Device Id: 5 0014ee 2058f7e3b
Firmware Version: 51.0AB51
User Capacity:    2,000,398,934,016 bytes [2.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   8
ATA Standard is:  Exact ATA specification draft version not indicated
Local Time is:    Fri Apr  5 16:02:30 2013 EDT
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:                (37560) 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:        ( 362) minutes.
Conveyance self-test routine
recommended polling time:        (   5) minutes.
SCT capabilities:              (0x3035) SCT Status 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       -       0
  3 Spin_Up_Time            0x0027   166   164   021    Pre-fail  Always       -       6658
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       28
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   094   094   000    Old_age   Always       -       4693
 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       -       26
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       11
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       1043
194 Temperature_Celsius     0x0022   119   110   000    Old_age   Always       -       31
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   200   200   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      -       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%      4693         -
# 2  Short offline       Completed without error       00%      4608         -
# 3  Short offline       Completed without error       00%      3870         -
# 4  Short offline       Completed without error       00%      3199         -
# 5  Short offline       Completed without error       00%      2456         -
# 6  Short offline       Completed without error       00%      1740         -
# 7  Short offline       Completed without error       00%      1020         -
# 8  Short offline       Completed without error       00%       399         -
# 9  Short offline       Completed without error       00%        20         -

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.

I don't see any errors or issues, but I'll keep an eye on it.... Thanks all.

titan_rw · Apr 5, 2013

I'd run a long smart test on ada2. If not on the rest of the drives too. It's been my experience short smart tests don't really tell you much. I've had many drives pass a short test, but subsequently fail a long test.

I'd also probably rescrub the pool, if it were me. Just to be double sure there's no problems.

With single parity vdevs, you have to be extra careful. Consider if you had a drive failure (that wasn't ada2), before those checksum errors were fixed. Now during resilvering, the 81 checksum errors from ada2 show up. You have no more redundancy left to correct them. You've lost data somewhere. That's why raidz2 is recommended. You can be resilvering a drive, and still correct any other drive that happens to return bad data.

shackrock · Apr 6, 2013

titan_rw said:
I'd run a long smart test on ada2. If not on the rest of the drives too. It's been my experience short smart tests don't really tell you much. I've had many drives pass a short test, but subsequently fail a long test.

I'd also probably rescrub the pool, if it were me. Just to be double sure there's no problems.

With single parity vdevs, you have to be extra careful. Consider if you had a drive failure (that wasn't ada2), before those checksum errors were fixed. Now during resilvering, the 81 checksum errors from ada2 show up. You have no more redundancy left to correct them. You've lost data somewhere. That's why raidz2 is recommended. You can be resilvering a drive, and still correct any other drive that happens to return bad data.

Yea, if I could do it again I'd definately pick Z2. Unfortunately now these things are so full, it'd be a nightmare to buy new drives, move all the data to those, create new RaidZ2 pool, then move all back. haha. Unless you know a secret way to "upgrade" to Z2?

cyberjock · Apr 6, 2013

What you could do, and I did this for a friend. Buy new drives, make a new RAIDZ2 and copy the data to them. Then destroy the RAIDZ1 and add those disks to the new zpool as a new vdev in RAIDZ2. Of course, you might want to buy an extra drive for the current RAIDZ1 for when it is "recycled" as a RAIDZ2.

shackrock · Apr 6, 2013

Yea, but at this point that means new enclosure + PSU + drives = $600+... haha

cyberjock · Apr 6, 2013

Oh.

Yeah, I didn't have any issues because I planned for potentially 24 drives in the system(of which there were only 8 at the time).

shackrock · Apr 6, 2013

Results from long test, no errors. =)

Code:

[root@freenas] ~# smartctl -a /dev/ada1
smartctl 5.43 2012-06-30 r3573 [FreeBSD 8.3-RELEASE-p6 amd64] (local build)
Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Caviar Green (Adv. Format)
Device Model:     WDC WD20EARS-00MVWB0
Serial Number:    WD-WCAZA4653360
LU WWN Device Id: 5 0014ee 2058f7e3b
Firmware Version: 51.0AB51
User Capacity:    2,000,398,934,016 bytes [2.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   8
ATA Standard is:  Exact ATA specification draft version not indicated
Local Time is:    Sat Apr  6 16:38:33 2013 EDT
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:                (37560) 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:        ( 362) minutes.
Conveyance self-test routine
recommended polling time:        (   5) minutes.
SCT capabilities:              (0x3035) SCT Status 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       -       0
  3 Spin_Up_Time            0x0027   166   164   021    Pre-fail  Always       -       6658
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       28
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   094   094   000    Old_age   Always       -       4718
 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       -       26
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       11
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       1043
194 Temperature_Celsius     0x0022   115   110   000    Old_age   Always       -       35
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   200   200   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      -       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  Extended offline    Completed without error       00%      4718         -
# 2  Short offline       Completed without error       00%      4693         -
# 3  Short offline       Completed without error       00%      4608         -
# 4  Short offline       Completed without error       00%      3870         -
# 5  Short offline       Completed without error       00%      3199         -
# 6  Short offline       Completed without error       00%      2456         -
# 7  Short offline       Completed without error       00%      1740         -
# 8  Short offline       Completed without error       00%      1020         -
# 9  Short offline       Completed without error       00%       399         -
#10  Short offline       Completed without error       00%        20         -

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.

motoxer913 · Dec 19, 2016

Thanks Guys! I was having a similar problem with checksum errors on ada0 after rebuilding my freenas with 5 brand new WD Red NAS 2TB drives installed in a Z1 with a fresh rebuild onto 9.10 and a brand new pool. My best guess is possibly a power surge caused it? But I first noticed a problem when TimeMachine had trouble doing it's backups...all of the corrupt files were in my time machine share.

Anyways, using your direction above I deleted my entire time machine folder from Freenas to remove all the corrupt files...after I had backed up my machine to another drive first. I ended up replacing the SATA cable to ada0 just in case it was an issue with the cable. I ran short and long smart tests before and after I ran a zpool clear. After the zpool clear I ran another scrub and smart test and all of the checksum errors are now clear and all is well. Fingers crossed this was a fluke and I don't have a failing drive...I'm buying a new UPS as a result as a power surge is the only thing I can think of that would have caused the problem. This is a super important NAS as my 3 yo daughter can't live without her movies streaming off of Plex! LOL

SweetAndLow · Dec 20, 2016

motoxer913 said:
Thanks Guys! I was having a similar problem with checksum errors on ada0 after rebuilding my freenas with 5 brand new WD Red NAS 2TB drives installed in a Z1 with a fresh rebuild onto 9.10 and a brand new pool. My best guess is possibly a power surge caused it? But I first noticed a problem when TimeMachine had trouble doing it's backups...all of the corrupt files were in my time machine share.

Anyways, using your direction above I deleted my entire time machine folder from Freenas to remove all the corrupt files...after I had backed up my machine to another drive first. I ended up replacing the SATA cable to ada0 just in case it was an issue with the cable. I ran short and long smart tests before and after I ran a zpool clear. After the zpool clear I ran another scrub and smart test and all of the checksum errors are now clear and all is well. Fingers crossed this was a fluke and I don't have a failing drive...I'm buying a new UPS as a result as a power surge is the only thing I can think of that would have caused the problem. This is a super important NAS as my 3 yo daughter can't live without her movies streaming off of Plex! LOL

Did you burn in your drives? You don't just randomly get checksum errors.

Sent from my Nexus 5X using Tapatalk

hamby · Nov 6, 2017

motoxer913 said:
Thanks Guys! I was having a similar problem with checksum errors on ada0 after rebuilding my freenas with 5 brand new WD Red NAS 2TB drives installed in a Z1 with a fresh rebuild onto 9.10 and a brand new pool. My best guess is possibly a power surge caused it? But I first noticed a problem when TimeMachine had trouble doing it's backups...all of the corrupt files were in my time machine share.

Anyways, using your direction above I deleted my entire time machine folder from Freenas to remove all the corrupt files...after I had backed up my machine to another drive first. I ended up replacing the SATA cable to ada0 just in case it was an issue with the cable. I ran short and long smart tests before and after I ran a zpool clear. After the zpool clear I ran another scrub and smart test and all of the checksum errors are now clear and all is well. Fingers crossed this was a fluke and I don't have a failing drive...I'm buying a new UPS as a result as a power surge is the only thing I can think of that would have caused the problem. This is a super important NAS as my 3 yo daughter can't live without her movies streaming off of Plex! LOL[/QUOTEvah

have you had any more problems? I noticed a Checksum error after Time Machine would not back up as well. Before I go and replace the drive and regret doing z1 I would like to know if you are still error free.

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checksum errors after scrub on Zpool

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