Hello, I just noticed that the Pool Status of my NAS is unhealthy, telling me one of the four disks has errors.
The Disk in question shows:
Checksum Errors: 2
The output of smartctl is attached below.
I am not well versed in interpreting said output, therefore I’d highly appreciate it, if someone could offer further assistance in the matter and tell me, if the hard drive needs to be replaced, which would be rather sad, since it is the newest disk in the array.
root@freenas[~]# smartctl -a /dev/sdd
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: Toshiba MG08ACA... Enterprise Capacity HDD
Device Model: TOSHIBA MG08ACA16TE
Serial Number: 41R0A1M3F57H
LU WWN Device Id: 5 000039 ad8d356d2
Firmware Version: 4002
User Capacity: 16,000,900,661,248 bytes [16.0 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 7200 rpm
Form Factor: 3.5 inches
Device is: In smartctl database 7.3/5528
ATA Version is: ACS-3 T13/2161-D revision 5
SATA Version is: SATA 3.3, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Mon Mar 9 10:43:37 2026 CET
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: ( 120) 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: ( 2) minutes.
Extended self-test routine
recommended polling time: (1462) 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 100 100 050 Pre-fail Always - 0
2 Throughput_Performance 0x0005 100 100 050 Pre-fail Offline - 0
3 Spin_Up_Time 0x0027 100 100 001 Pre-fail Always - 8112
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 32
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0
7 Seek_Error_Rate 0x000b 100 100 050 Pre-fail Always - 0
8 Seek_Time_Performance 0x0005 100 100 050 Pre-fail Offline - 0
9 Power_On_Hours 0x0032 039 039 000 Old_age Always - 24564
10 Spin_Retry_Count 0x0033 100 100 030 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 32
23 Helium_Condition_Lower 0x0023 100 100 075 Pre-fail Always - 0
24 Helium_Condition_Upper 0x0023 100 100 075 Pre-fail Always - 0
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 - 27
193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 48
194 Temperature_Celsius 0x0022 100 100 000 Old_age Always - 41 (Min/Max 11/48)
196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
220 Disk_Shift 0x0002 100 100 000 Old_age Always - 286392333
222 Loaded_Hours 0x0032 041 041 000 Old_age Always - 23967
223 Load_Retry_Count 0x0032 100 100 000 Old_age Always - 0
224 Load_Friction 0x0022 100 100 000 Old_age Always - 0
226 Load-in_Time 0x0026 100 100 000 Old_age Always - 523
240 Head_Flying_Hours 0x0001 100 100 001 Pre-fail 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% 24482 -
# 2 Short offline Completed without error 00% 23738 -
# 3 Extended offline Completed without error 00% 23184 -
# 4 Short offline Completed without error 00% 22994 -
# 5 Short offline Completed without error 00% 22274 -
# 6 Short offline Completed without error 00% 21530 -
# 7 Short offline Completed without error 00% 20810 -
# 8 Extended offline Completed without error 00% 20256 -
# 9 Short offline Completed without error 00% 20066 -
#10 Short offline Completed without error 00% 19322 -
#11 Short offline Completed without error 00% 18601 -
#12 Short offline Completed without error 00% 17857 -
#13 Short offline Completed without error 00% 17326 -
#14 Short offline Completed without error 00% 16925 -
#15 Short offline Completed without error 00% 16471 -
#16 Short offline Completed without error 00% 15799 -
#17 Short offline Completed without error 00% 15054 -
#18 Extended offline Completed without error 00% 14501 -
#19 Short offline Completed without error 00% 13705 -
#20 Short offline Completed without error 00% 12960 -
#21 Short offline Completed without error 00% 12240 -
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