Freenas reporting SMART errors, I don't see anything in smartctl

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John Richardson

John Richardson

Explorer
Joined
May 17, 2014
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60
Hi all,

Sorry, I'm admittedly a newb, but I'm working on learning more! I recently had a drive report smart errors, but it was a WD black that wasn't designed for NAS work and I didn't know about a change that I needed to make to the drive (I'm forgetting what it was now) until it was too late(ish) and the drive was already on it's way out. The other three drives are WD Reds, and the fourth replacement drive is a HGST.

Anyhow, I replaced the black with the HGST and resilvered. All went swimmingly. Now, a couple of weeks later I have a couple of drives reporting smart errors from the dashboard:

  • CRITICAL: Device: /dev/ada3, failed to read SMART Attribute Data
  • CRITICAL: Device: /dev/ada1, failed to read SMART Attribute Data
  • OK: There is a new update available! Apply it in System -> Update tab.
Click to expand...

So I jumped into the shell and ran "smartctl -a /dev/ada_" for all four drives. Below is a copy of that information. If anyone sees something I don't, or has any ideas on how to fix this that would be GREAT! :)

I hope my disks are still ok, though I think the reds are all still under warranty with WD so I can easily RMA them if need be.

Thanks in advance!

John

Drive 0:
Code:
[root@freenas] ~# smartctl -a /dev/ada0
smartctl 6.3 2014-07-26 r3976 [FreeBSD 9.3-RELEASE-p26 amd64] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD30EFRX-68EUZN0
Serial Number:    WD-WCC4N0847776
LU WWN Device Id: 5 0014ee 25f466952
Firmware Version: 80.00A80
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: 6.0 Gb/s)
Local Time is:    Sun Nov 15 22:57:26 2015 EST
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:                (38160) 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:        ( 383) 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       -       0
  3 Spin_Up_Time            0x0027   195   176   021    Pre-fail  Always       -       5216
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       138
  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   084   084   000    Old_age   Always       -       12001
10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       118
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       64
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       163
194 Temperature_Celsius     0x0022   117   104   000    Old_age   Always       -       33
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   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   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%     10838         -
# 2  Short offline       Completed without error       00%     10670         -
# 3  Extended offline    Completed without error       00%     10582         -
# 4  Short offline       Completed without error       00%     10502         -
# 5  Short offline       Completed without error       00%     10286         -
# 6  Extended offline    Completed without error       00%     10222         -
# 7  Short offline       Completed without error       00%     10094         -
# 8  Short offline       Completed without error       00%      9926         -
# 9  Extended offline    Completed without error       00%      9839         -
#10  Short offline       Completed without error       00%      9759         -
#11  Short offline       Completed without error       00%      9543         -
#12  Extended offline    Completed without error       00%      9484         -
#13  Short offline       Completed without error       00%      9351         -
#14  Short offline       Completed without error       00%      9183         -
#15  Extended offline    Completed without error       00%      9098         -
#16  Short offline       Completed without error       00%      9015         -
#17  Short offline       Completed without error       00%      8824         -
#18  Extended offline    Completed without error       00%      8761         -
#19  Short offline       Completed without error       00%      8632         -
#20  Short offline       Completed without error       00%      8464         -
#21  Extended offline    Completed without error       00%      8376         -

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.

Drive 1:
Code:
[root@freenas] ~# smartctl -a /dev/ada1
smartctl 6.3 2014-07-26 r3976 [FreeBSD 9.3-RELEASE-p26 amd64] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD30EFRX-68EUZN0
Serial Number:    WD-WCC4N0901970
LU WWN Device Id: 5 0014ee 25f5ce875
Firmware Version: 80.00A80
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: 6.0 Gb/s)
Local Time is:    Sun Nov 15 22:55:43 2015 EST
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:                (38940) 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:        ( 391) 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       -       0
  3 Spin_Up_Time            0x0027   194   176   021    Pre-fail  Always       -       5266
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       137
  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   084   084   000    Old_age   Always       -       12000
10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       117
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       64
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       160
194 Temperature_Celsius     0x0022   117   106   000    Old_age   Always       -       33
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   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   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%     10837         -
# 2  Short offline       Completed without error       00%     10669         -
# 3  Extended offline    Completed without error       00%     10582         -
# 4  Short offline       Completed without error       00%     10502         -
# 5  Short offline       Completed without error       00%     10286         -
# 6  Extended offline    Completed without error       00%     10222         -
# 7  Short offline       Completed without error       00%     10094         -
# 8  Short offline       Completed without error       00%      9926         -
# 9  Extended offline    Completed without error       00%      9839         -
#10  Short offline       Completed without error       00%      9758         -
#11  Short offline       Completed without error       00%      9542         -
#12  Extended offline    Completed without error       00%      9484         -
#13  Short offline       Completed without error       00%      9351         -
#14  Short offline       Completed without error       00%      9183         -
#15  Extended offline    Completed without error       00%      9098         -
#16  Short offline       Completed without error       00%      9015         -
#17  Short offline       Completed without error       00%      8823         -
#18  Extended offline    Completed without error       00%      8761         -
#19  Short offline       Completed without error       00%      8632         -
#20  Short offline       Completed without error       00%      8464         -
#21  Extended offline    Completed without error       00%      8376         -

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.

[root@freenas] ~#


Drive 2 (this is the HGST, the one that was just replaced):
Code:
[root@freenas] ~# smartctl -a /dev/ada2
smartctl 6.3 2014-07-26 r3976 [FreeBSD 9.3-RELEASE-p26 amd64] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     HGST Deskstar NAS
Device Model:     HGST HDN724030ALE640
Serial Number:    PK2234P9HXR8WY
LU WWN Device Id: 5 000cca 248db258e
Firmware Version: MJ8OA5E0
User Capacity:    3,000,592,982,016 bytes [3.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Form Factor:      3.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Sun Nov 15 22:57:32 2015 EST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
^[[ASMART 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:                (   24) 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:        (   1) minutes.
Extended self-test routine
recommended polling time:        ( 443) 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   135   135   054    Pre-fail  Offline      -       85
  3 Spin_Up_Time            0x0007   100   100   024    Pre-fail  Always       -       0
  4 Start_Stop_Count        0x0012   100   100   000    Old_age   Always       -       1
  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   124   124   020    Pre-fail  Offline      -       33
  9 Power_On_Hours          0x0012   100   100   000    Old_age   Always       -       441
10 Spin_Retry_Count        0x0013   100   100   060    Pre-fail  Always       -       0
12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       1
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       7
193 Load_Cycle_Count        0x0012   100   100   000    Old_age   Always       -       7
194 Temperature_Celsius     0x0002   176   176   000    Old_age   Always       -       34 (Min/Max 21/36)
196 Reallocated_Event_Count 0x0032   100   100   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0022   100   100   000    Old_age   Always       -       0
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
No self-tests have been logged.  [To run self-tests, use: smartctl -t]

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.


Drive 3:
Code:
[root@freenas] ~# smartctl -a /dev/ada3
smartctl 6.3 2014-07-26 r3976 [FreeBSD 9.3-RELEASE-p26 amd64] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD30EFRX-68EUZN0
Serial Number:    WD-WCC4N0889597
LU WWN Device Id: 5 0014ee 20a072f8d
Firmware Version: 80.00A80
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: 6.0 Gb/s)
Local Time is:    Sun Nov 15 22:57:38 2015 EST
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:                (39060) 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:        ( 392) 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       -       0
  3 Spin_Up_Time            0x0027   181   175   021    Pre-fail  Always       -       5933
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       137
  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   084   084   000    Old_age   Always       -       12001
10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       117
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       64
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       162
194 Temperature_Celsius     0x0022   118   108   000    Old_age   Always       -       32
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   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   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%     10837         -
# 2  Short offline       Completed without error       00%     10670         -
# 3  Extended offline    Completed without error       00%     10582         -
# 4  Short offline       Completed without error       00%     10502         -
# 5  Short offline       Completed without error       00%     10286         -
# 6  Extended offline    Completed without error       00%     10222         -
# 7  Short offline       Completed without error       00%     10094         -
# 8  Short offline       Completed without error       00%      9926         -
# 9  Extended offline    Completed without error       00%      9839         -
#10  Short offline       Completed without error       00%      9758         -
#11  Short offline       Interrupted (host reset)      90%      9543         -
#12  Extended offline    Completed without error       00%      9484         -
#13  Short offline       Completed without error       00%      9351         -
#14  Short offline       Completed without error       00%      9183         -
#15  Extended offline    Completed without error       00%      9099         -
#16  Short offline       Completed without error       00%      9015         -
#17  Short offline       Completed without error       00%      8823         -
#18  Extended offline    Completed without error       00%      8761         -
#19  Short offline       Completed without error       00%      8632         -
#20  Short offline       Completed without error       00%      8464         -
#21  Extended offline    Completed without error       00%      8377         -

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.

[root@freenas] ~#
 
R

Robert Trevellyan

Pony Wrangler
Joined
May 16, 2014
Messages
3,778
John Richardson said:
I have a couple of drives reporting smart errors
Click to expand...
What you actually have is a failure to read the SMART data. If you search for that error you'll see several threads about it, but not much in the way of conclusions.
 
John Richardson

John Richardson

Explorer
Joined
May 17, 2014
Messages
60
Ahhhh, got it... thank you.

I guess as I've done the SMART tests via the shell and everything looks okie-dokie I'll just leave it for now?
 
R

Robert Trevellyan

Pony Wrangler
Joined
May 16, 2014
Messages
3,778
John Richardson said:
I've done the SMART tests via the shell
Click to expand...
You've read the data using smartctl and it doesn't show anything obviously alarming. On the default schedule, FreeNAS tries to read it every 30 minutes, so an occasional failure to read seems insignificant, but it shouldn't happen.

What are your full hardware specs?
 
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