Problem with storage unreadable sectors but check complete with no errors

ldevac · Dec 7, 2017

Dear,

are a couple of days that an our storage give us a problem on the alert box, that exists some sectors that are not readable:

Code:

Dec 7 08:54:16 storage smartd[2619]: Device /dev/ada4, 16 Currently unreadable (pending) sectors
Dec 7 08:54:16 storage smartd[2619]: Device /dev/ada4, 16 Currently unreadable (pending) sectors
Dec 7 08:54:17 storage smartd[2619]: Device /dev/ada4, 16 Currently unreadable (pending) sectors
Dec 7 08:54:18 storage smartd[2619]: Device /dev/ada4, 16 Currently unreadable (pending) sectors
Dec 7 08:54:19 storage smartd[2619]: Device /dev/ada4, 16 Currently unreadable (pending) sectors

and so on.
Se we have made a smartd short and long test on /dev/ada4, but contrarily to what was expect give us no errors reported:

Code:

SMART Self-test log structure revision number 1																					 
Num  Test_Description	Status				  Remaining  LifeTime(hours)  LBA_of_first_error									 
[...]													
# 8  Extended offline	Completed without error	   00%	   383		 -													 
# 9  Extended offline	Completed without error	   00%	   357		 -													 
#10  Extended offline	Completed without error	   00%	   120		 -													 
#11  Extended offline	Completed without error	   00%		94		 -

So, no LBA_of_first_error filled and the result of the check was fine too:

Code:

Self-test execution status:	  (   0) The previous self-test routine completed without error or no self-test has ever been run

But the errors quoted before continue again and again.
Actually we have no more idea of what we can do in order to check that disk.
Someone here, can give us some glue?

Thank you in advanced.

Johnnie Black · Dec 7, 2017

Sometimes reported pending sectors are "false positives", in my experience this happens mostly with WD drives, though I just recently had a Toshiba doing the same, a full write of zeros to the disk may clear them, but if the extended SMART test passes without a read failure there's no harm on keeping it like that, just ignore the warnings and make sure extended SMART test are scheduled regularly.

danb35 · Dec 7, 2017

ldevac said:
Se we have made a smartd short and long test on /dev/ada4, but contrarily to what was expect give us no errors reported:

What you showed there were the 8th- through 11th- most recent SMART tests on that disk. What about the most recent ones? Actually, make it easy on us and you--what's the full output of smartctl -a /dev/ada4?

ldevac · Dec 7, 2017

Dear,

thank you to take the time to reply me.
Here you will find a full report of ada4:

Code:

smartctl 6.5 2016-05-07 r4318 [FreeBSD 11.0-STABLE amd64] (local build)															
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org														
																																  
=== START OF INFORMATION SECTION ===																							  
Model Family:	 HGST Ultrastar 7K6000																							
Device Model:	 HGST HUS726060ALE610																							
Serial Number:	K1H4S2VD																										
LU WWN Device Id: 5 000cca 255d03fac																							  
Firmware Version: APGNT907																										
User Capacity:	6,001,175,126,016 bytes [6.00 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:   ACS-2, ATA8-ACS T13/1699-D revision 4																			
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)																		  
Local Time is:	Thu Dec  7 14:33:03 2017 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:				(  113) 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:		( 791) 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   138   138   054	Pre-fail  Offline	  -	   100										
  3 Spin_Up_Time			0x0007   100   100   024	Pre-fail  Always	   -	   0										  
  4 Start_Stop_Count		0x0012   100   100   000	Old_age   Always	   -	   9										  
  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   128   128   020	Pre-fail  Offline	  -	   18										  
  9 Power_On_Hours		  0x0012   100   100   000	Old_age   Always	   -	   6653										
 10 Spin_Retry_Count		0x0013   100   100   060	Pre-fail  Always	   -	   0										  
 12 Power_Cycle_Count	   0x0032   100   100   000	Old_age   Always	   -	   9										  
192 Power-Off_Retract_Count 0x0032   100   100   000	Old_age   Always	   -	   251										
193 Load_Cycle_Count		0x0012   100   100   000	Old_age   Always	   -	   251										
194 Temperature_Celsius	 0x0002   113   113   000	Old_age   Always	   -	   53 (Min/Max 24/60)						  
196 Reallocated_Event_Count 0x0032   100   100   000	Old_age   Always	   -	   0										  
197 Current_Pending_Sector  0x0022   100   100   000	Old_age   Always	   -	   16										  
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																										
ATA Error Count: 2																												
		CR = Command Register [HEX]																								
		FR = Features Register [HEX]																							  
		SC = Sector Count Register [HEX]																						  
		SN = Sector Number Register [HEX]																						  
		CL = Cylinder Low Register [HEX]																						  
		CH = Cylinder High Register [HEX]																						  
		DH = Device/Head Register [HEX]	  
	   DC = Device Command Register [HEX]																						
		ER = Error register [HEX]																								  
		ST = Status register [HEX]																								
Powered_Up_Time is measured from power on, and printed as																		  
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,																			  
SS=sec, and sss=millisec. It "wraps" after 49.710 days.																			
																																  
Error 2 occurred at disk power-on lifetime: 6476 hours (269 days + 20 hours)													  
  When the command that caused the error occurred, the device was doing SMART Offline or Self-test.								
																																  
  After command completion occurred, registers were:																			  
  ER ST SC SN CL CH DH																											
  -- -- -- -- -- -- --																											
  40 41 00 00 00 00 00  Error: UNC at LBA = 0x00000000 = 0																		
																																  
  Commands leading to the command that caused the error were:																	  
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name																  
  -- -- -- -- -- -- -- --  ----------------  --------------------																  
  60 10 00 10 f4 75 40 08   3d+22:04:32.667  READ FPDMA QUEUED																	
  60 08 08 78 83 9b 40 08   3d+22:04:30.114  READ FPDMA QUEUED																	
  60 10 f8 c8 f1 75 40 08   3d+22:04:29.760  READ FPDMA QUEUED																	
  60 10 f0 80 ef 75 40 08   3d+22:04:29.750  READ FPDMA QUEUED																	
  60 20 e8 90 68 73 40 08   3d+22:04:29.749  READ FPDMA QUEUED																	
																																  
Error 1 occurred at disk power-on lifetime: 6440 hours (268 days + 8 hours)														
  When the command that caused the error occurred, the device was doing SMART Offline or Self-test.								
																																  
  After command completion occurred, registers were:																			  
  ER ST SC SN CL CH DH																											
  -- -- -- -- -- -- --																											
  40 41 00 00 00 00 00  Error: UNC at LBA = 0x00000000 = 0																		
																																  
  Commands leading to the command that caused the error were:																	  
  CR FR SC SN CL CH DH DC   Powered_Up_Time  Command/Feature_Name																  
  -- -- -- -- -- -- -- --  ----------------  --------------------																  
  60 20 30 38 49 8f 40 08   2d+09:51:23.776  READ FPDMA QUEUED  
  61 88 a0 e0 db b3 40 08   2d+09:51:22.086  WRITE FPDMA QUEUED																	
  61 d0 98 10 db b3 40 08   2d+09:51:22.085  WRITE FPDMA QUEUED																	
  61 00 90 10 da b3 40 08   2d+09:51:22.083  WRITE FPDMA QUEUED																	
  61 88 88 88 d9 b3 40 08   2d+09:51:22.082  WRITE FPDMA QUEUED																	
																																  
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%	  6638		 -													
# 2  Short offline	   Completed without error	   00%	  6551		 -													
# 3  Short offline	   Completed without error	   00%	  6531		 -													
# 4  Short offline	   Completed without error	   00%	  6478		 -													
# 5  Short offline	   Completed without error	   00%	  6461		 -													
# 6  Extended offline	Aborted by host			   70%	  6461		 -													
# 7  Extended offline	Aborted by host			   90%	  6441		 -													
# 8  Extended offline	Completed without error	   00%	   383		 -													
# 9  Extended offline	Completed without error	   00%	   357		 -													
#10  Extended offline	Completed without error	   00%	   120		 -													
#11  Extended offline	Completed without error	   00%		94		 -													
																																  
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'm fine, or there is more checks that are better to try?

ty

ldevac · Dec 12, 2017

danb35 said:
What you showed there were the 8th- through 11th- most recent SMART tests on that disk. What about the most recent ones? Actually, make it easy on us and you--what's the full output of smartctl -a /dev/ada4?

Hey danb35, have you seen my last reply with the full report?
What do you think about?

ty

Pitfrr · Dec 12, 2017

Your disk is running pretty hot: 53°C!
And I presume the other disks have the same temperature. You should cool them down. A good practice is to keep them under 40°C if you want to maximise their lifetime.

Also, it seems that you don't have SMART test scheduled regularly (or maybe you scheduled them recently since their 6400h then it's ok) and that too is a good practice.

As Johnnie Black said, I wouldn't worry much about the pending sectors, just keep an eye on it to be sure it doesn't evolve too much and that other IDs (like 196, 198) stay at 0.

Regarding error 1 and 2 occurring during the SMART test, I'll let some other more experienced members react.

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Problem with storage unreadable sectors but check complete with no errors

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