Ok, so how do you run a smart test or can’t it be done now
From the cli
smartctl -t long /dev/sdX
Where X is your driveletter
Thanks, I was just going to ask that
It is seemingly running now
smartctl -a /dev/sdX
Will show you the results.
My TrueNAS gui doesn’t stay open for very long and when I checked I was logged out. Logging in again took me to the shell, but no actions or anything were showing How do I stay logged in while the test is running
Just check back on it later. It takes a while depending on the drive size. It will keep running the test in the background on the system.
Ok, but after it has finished where do I find the results of the smart test.
Also via cli or install the scrutiny app for a webui
smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.12.33-production+truenas] (local build)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Purple (Pro)
Device Model: WDC WD10PURZ-85U8XY0
Serial Number: WD-WCC4JFDM719T
LU WWN Device Id: 5 0014ee 215b9b049
Firmware Version: 01.01A01
User Capacity: 1,000,204,886,016 bytes [1.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Device is: In smartctl database 7.3/5528
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: Mon Feb 16 09:08:58 2026 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: (0x00) Offline data collection activity
was never started.
Auto Offline Data Collection: Disabled.
Self-test execution status: ( 249) Self-test routine in progress...
90% of test remaining.
Total time to complete Offline
data collection: (13980) 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: ( 159) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x303d) 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 136 134 021 Pre-fail Always - 4183
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 69
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 069 069 000 Old_age Always - 22706
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 - 67
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 61
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 7
194 Temperature_Celsius 0x0022 113 099 000 Old_age Always - 30
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 - 646
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% 22697 -
# 2 Extended offline Completed without error 00% 22696 -
# 3 Short offline Completed without error 00% 22673 -
# 4 Short offline Completed without error 00% 22649 -
# 5 Short offline Completed without error 00% 22625 -
# 6 Short offline Completed without error 00% 22602 -
# 7 Short offline Completed without error 00% 22578 -
# 8 Short offline Completed without error 00% 22554 -
# 9 Short offline Completed without error 00% 22530 -
#10 Short offline Completed without error 00% 22506 -
#11 Short offline Completed without error 00% 22482 -
#12 Short offline Completed without error 00% 22458 -
#13 Short offline Completed without error 00% 22434 -
#14 Short offline Completed without error 00% 22410 -
#15 Short offline Completed without error 00% 22386 -
#16 Short offline Completed without error 00% 22362 -
#17 Short offline Completed without error 00% 22338 -
#18 Short offline Completed without error 00% 22314 -
#19 Short offline Completed without error 00% 22290 -
#20 Short offline Completed without error 00% 22266 -
#21 Short offline Completed without error 00% 22242 -
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.
The above only provides legacy SMART information - try 'smartctl -x' for more
Auto Offline Data Collection: Disabled.
Self-test execution status: ( 249) Self-test routine in progress...
90% of test remaining.
it is still running…
This tells you how long tests take (assuming an otherwise inactive drive), and smartctl -t returned with the estimated time of completion. Next time, write this down and come back some time later.
root@freenas[~]# smartctl -a /dev/sdg
smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.12.33-production+truenas] (local build)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Purple (Pro)
Device Model: WDC WD10PURZ-85U8XY0
Serial Number: WD-WCC4JFDM719T
LU WWN Device Id: 5 0014ee 215b9b049
Firmware Version: 01.01A01
User Capacity: 1,000,204,886,016 bytes [1.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Device is: In smartctl database 7.3/5528
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: Mon Feb 16 16:09:57 2026 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: (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: (13980) 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: ( 159) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x303d) 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 136 134 021 Pre-fail Always - 4183
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 69
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 069 069 000 Old_age Always - 22713
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 - 67
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 61
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 7
194 Temperature_Celsius 0x0022 113 099 000 Old_age Always - 30
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 - 646
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% 22708 -
# 2 Short offline Completed without error 00% 22697 -
# 3 Extended offline Completed without error 00% 22696 -
# 4 Short offline Completed without error 00% 22673 -
# 5 Short offline Completed without error 00% 22649 -
# 6 Short offline Completed without error 00% 22625 -
# 7 Short offline Completed without error 00% 22602 -
# 8 Short offline Completed without error 00% 22578 -
# 9 Short offline Completed without error 00% 22554 -
#10 Short offline Completed without error 00% 22530 -
#11 Short offline Completed without error 00% 22506 -
#12 Short offline Completed without error 00% 22482 -
#13 Short offline Completed without error 00% 22458 -
#14 Short offline Completed without error 00% 22434 -
#15 Short offline Completed without error 00% 22410 -
#16 Short offline Completed without error 00% 22386 -
#17 Short offline Completed without error 00% 22362 -
#18 Short offline Completed without error 00% 22338 -
#19 Short offline Completed without error 00% 22314 -
#20 Short offline Completed without error 00% 22290 -
#21 Short offline Completed without error 00% 22266 -
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.
The above only provides legacy SMART information - try 'smartctl -x' for more
I started the test at about 10 am, and it now about 4pm in the UK
ZFS Info:
Read Errors:
310
Write Errors:
0
Checksum Errors:
284
Because the disc is degraded and there so many errors, I want to remove it, format it and use for something else.
As TrueNAS won’t let me offline or replace it, can I just disconnect it, as that seems to be the only way I can think of.
Thanks
That amounts to destroying the pool, which may be acceptable if the content is only CCTV records.
Yes I thought as much but is there a better way
That error usually appears when the pool has no redundancy left. Since your pool only has two disks and one is already failing, TrueNAS won’t let you offline it because there isn’t a valid replica to keep the data safe.
Before removing anything, make sure you back up any important footage. After that, you can shut the system down and replace the failing drive, then use the replace/resilver option to rebuild the pool. If the pool was created without mirroring, you may need to recreate it after swapping the disk.
Ok thanks, but I removed the disk then used the 2Tb disc for the same pool. I then created the datasets as I had before.
The data isn’t or wasn’t important, as it is just local footage around my property