Failed Drive?

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rfvgyhn

Dabbler
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Nov 26, 2014
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I'm getting the following critical errors when logging into FreeNAS:
Code:
Device: /dev/ada0, 1 Currently unreadable (pending) sectors
Device: /dev/ada0, 2 Offline uncorrectable sectors

smartctl -q noserial -a /dev/ada0 says PASSED but it also shows read failures. A fresh scrub shows everything is online with no errors which I would expect there to be some sort of error info.

It seems like my drive is failing/failed, but the output seems contradictory to me. Do I need to replace my drive?

Code:
pool: storage
state: ONLINE
  scan: scrub repaired 0 in 8h9m with 0 errors on Thu Nov  9 00:12:11 2017
config:

	NAME											STATE	 READ WRITE CKSUM
	storage										 ONLINE	   0	 0	 0
	  raidz2-0									  ONLINE	   0	 0	 0
		gptid/bf0771be-7fbd-11e4-abfb-d050995afcdc  ONLINE	   0	 0	 0
		gptid/c017582f-7fbd-11e4-abfb-d050995afcdc  ONLINE	   0	 0	 0
		gptid/c11b84bf-7fbd-11e4-abfb-d050995afcdc  ONLINE	   0	 0	 0
		gptid/c228158d-7fbd-11e4-abfb-d050995afcdc  ONLINE	   0	 0	 0
		gptid/c33aac95-7fbd-11e4-abfb-d050995afcdc  ONLINE	   0	 0	 0
		gptid/c44078bc-7fbd-11e4-abfb-d050995afcdc  ONLINE	   0	 0	 0

errors: No known data errors


Code:
=== 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:		 (51720) 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:	 ( 517) minutes.
Conveyance self-test routine
recommended polling time:	 (   5) minutes.
SCT capabilities:			(0x7035)	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	   -	   24
  3 Spin_Up_Time			0x0027   194   176   021	Pre-fail  Always	   -	   7275
  4 Start_Stop_Count		0x0032   100   100   000	Old_age   Always	   -	   61
  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   067   067   000	Old_age   Always	   -	   24289
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	   -	   61
192 Power-Off_Retract_Count 0x0032   200   200   000	Old_age   Always	   -	   31
193 Load_Cycle_Count		0x0032   200   200   000	Old_age   Always	   -	   388
194 Temperature_Celsius	 0x0022   118   104   000	Old_age   Always	   -	   34
196 Reallocated_Event_Count 0x0032   200   200   000	Old_age   Always	   -	   0
197 Current_Pending_Sector  0x0032   200   200   000	Old_age   Always	   -	   1
198 Offline_Uncorrectable   0x0030   200   200   000	Old_age   Offline	  -	   2
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	  -	   2

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: read failure	   90%	 24267		 3519065096
# 2  Short offline	   Completed: read failure	   90%	 24242		 3519065096
# 3  Short offline	   Completed: read failure	   90%	 24194		 3519065096
# 4  Short offline	   Completed: read failure	   90%	 24193		 3519065096
# 5  Short offline	   Completed: read failure	   90%	 24145		 3519065096
# 6  Short offline	   Completed: read failure	   90%	 24097		 3519065096
# 7  Short offline	   Completed: read failure	   60%	 24073		 3519065096
# 8  Short offline	   Completed: read failure	   90%	 24025		 3519065096
# 9  Short offline	   Completed: read failure	   90%	 23977		 3519065096
#10  Short offline	   Completed: read failure	   90%	 23929		 3519065096
#11  Short offline	   Completed: read failure	   90%	 23881		 3519065096
#12  Extended offline	Completed: read failure	   10%	 23868		 3519065096
#13  Short offline	   Completed: read failure	   10%	 23833		 3519065096
#14  Short offline	   Completed: read failure	   20%	 23785		 3519065096
#15  Short offline	   Completed: read failure	   10%	 23738		 3519065096
#16  Short offline	   Completed: read failure	   90%	 23690		 3519065096
#17  Short offline	   Completed: read failure	   90%	 23642		 3519065096
#18  Short offline	   Completed: read failure	   60%	 23594		 3519065096
#19  Short offline	   Completed: read failure	   60%	 23546		 3519065096
#20  Extended offline	Completed: read failure	   10%	 23532		 3519065096
#21  Short offline	   Completed: read failure	   60%	 23498		 3519065096

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.
 
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Joined
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Chris Moore

Hall of Famer
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May 2, 2015
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says PASSED but it also shows read failures. A fresh scrub shows everything is online with no errors which I would expect there to be some sort of error info.

It seems like my drive is failing/failed, but the output seems contradictory to me. Do I need to replace my drive?
The scrub is about a data error in the stored data, not a hardware error in the mechanical drive.
You can have a bad drive and a clean scrub and that spot where the SMART test says it PASSED is often totally a lie, don't even look at that.

This right here:
Code:
197 Current_Pending_Sector 0x0032 200 200 000	Old_age Always	 -	 1
198 Offline_Uncorrectable 0x0030 200 200 000	Old_age Offline	 -	 2

SMART Self-test log structure revision number 1
Num Test_Description	Status				 Remaining LifeTime(hours) LBA_of_first_error
# 1 Extended offline	Completed: read failure	 90%	24267		3519065096

Tells us that there is a block of data that cannot be read. The drive is failed and needs to be replaced. If it is under warranty, send it back. It is only about 2.8 years of power on hours. Depending on the manufacture date and model of drive, it could still be under warranty.
 
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