Mirror degraded, in need of advice

[lukeren]

I've got a simple mirror that's degraded. After reading up on the errors I got (host reset smart test, bunch of SCSI CAM errors), I tried changing the SAS->SATA fanout cable and powersupply.
When I booted it back up, it failed again pretty quickly and started running a scrub. The scrub ran for a long time with the below status.

Code:

gptid/b3d78fb2-779a-11e7-85fe-941882081dee  ONLINE	   0	 0	 0
gptid/b4990800-779a-11e7-85fe-941882081dee  DEGRADED	 0	 0   691  too many errors (repairing)

There has been no further SCSI CAM errors in /var/log/messages.

After it was done, zpool status had the status of "scrub repaired 5.08M in 0 days 23:56:04 with 0 errors on Sun Apr 22 20:25:56 2018", but it's still degraded.
I'm currently running a long smart test, which seems to complete without errors. If it does, what should be my next move? zpool clear?

 

[gpsguy]

Post the results of the long test in code tags.

Even though it completes the test, by looking at the raw data, we might see that the drive is failing. Do you have a spare on hand?

 

[lukeren]

No spare, but I've got the data backed up.
I'll post the results when it finishes.

 

[lukeren]

Code:

smartctl 6.6 2017-11-05 r4594 [FreeBSD 11.1-STABLE amd64] (local build)
Copyright (C) 2002-17, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:	 Seagate Archive HDD
Device Model:	 ST8000AS0002-1NA17Z
Serial Number:	Z840Y4XF
LU WWN Device Id: 5 000c50 0a1da97b0
Firmware Version: AR17
User Capacity:	8,001,563,222,016 bytes [8.00 TB]
Sector Sizes:	 512 bytes logical, 4096 bytes physical
Rotation Rate:	5980 rpm
Device is:		In smartctl database [for details use: -P show]
ATA Version is:   ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:	Mon Apr 23 14:11:19 2018 CEST
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:				(	0) 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:		(   1) minutes.
Extended self-test routine
recommended polling time:		( 964) minutes.
Conveyance self-test routine
recommended polling time:		(   2) minutes.
SCT capabilities:			  (0x30b5) SCT Status supported.
										SCT Feature Control supported.
										SCT Data Table supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME		  FLAG	 VALUE WORST THRESH TYPE	  UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate	 0x000f   119   099   006	Pre-fail  Always	   -	   208987424
  3 Spin_Up_Time			0x0003   094   090   000	Pre-fail  Always	   -	   0
  4 Start_Stop_Count		0x0032   100   100   020	Old_age   Always	   -	   45
  5 Reallocated_Sector_Ct   0x0033   100   100   010	Pre-fail  Always	   -	   0
  7 Seek_Error_Rate		 0x000f   081   060   030	Pre-fail  Always	   -	   161342022
  9 Power_On_Hours		  0x0032   093   093   000	Old_age   Always	   -	   6468
 10 Spin_Retry_Count		0x0013   100   100   097	Pre-fail  Always	   -	   0
 12 Power_Cycle_Count	   0x0032   100   100   020	Old_age   Always	   -	   45
183 Runtime_Bad_Block	   0x0032   100   100   000	Old_age   Always	   -	   0
184 End-to-End_Error		0x0032   100   100   099	Old_age   Always	   -	   0
187 Reported_Uncorrect	  0x0032   100   100   000	Old_age   Always	   -	   0
188 Command_Timeout		 0x0032   100   100   000	Old_age   Always	   -	   0
189 High_Fly_Writes		 0x003a   100   100   000	Old_age   Always	   -	   0
190 Airflow_Temperature_Cel 0x0022   063   058   045	Old_age   Always	   -	   37 (Min/Max 32/39)
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	   -	   459
193 Load_Cycle_Count		0x0032   100   100   000	Old_age   Always	   -	   502
194 Temperature_Celsius	 0x0022   037   042   000	Old_age   Always	   -	   37 (0 22 0 0 0)
195 Hardware_ECC_Recovered  0x001a   119   099   000	Old_age   Always	   -	   208987424
197 Current_Pending_Sector  0x0012   100   100   000	Old_age   Always	   -	   0
198 Offline_Uncorrectable   0x0010   100   100   000	Old_age   Offline	  -	   0
199 UDMA_CRC_Error_Count	0x003e   200   200   000	Old_age   Always	   -	   0
240 Head_Flying_Hours	   0x0000   100   253   000	Old_age   Offline	  -	   6453 (22 30 0)
241 Total_LBAs_Written	  0x0000   100   253   000	Old_age   Offline	  -	   75649419732
242 Total_LBAs_Read		 0x0000   100   253   000	Old_age   Offline	  -	   149597440680

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%	  6467		 -
# 2  Extended offline	Interrupted (host reset)	  00%	  6439		 -
# 3  Short offline	   Completed without error	   00%	  6426		 -
# 4  Short offline	   Interrupted (host reset)	  00%	  6426		 -
# 5  Extended offline	Completed without error	   00%	  4557		 -
# 6  Short offline	   Completed without error	   00%	  4517		 -
# 7  Extended offline	Completed without error	   00%	  3813		 -
# 8  Short offline	   Completed without error	   00%	  3773		 -
# 9  Extended offline	Completed without error	   00%	  3068		 -
#10  Short offline	   Completed without error	   00%	  3029		 -
#11  Extended offline	Completed without error	   00%	  2348		 -
#12  Short offline	   Completed without error	   00%	  2309		 -
#13  Extended offline	Completed without error	   00%	  1604		 -
#14  Short offline	   Completed without error	   00%	  1565		 -
#15  Extended offline	Completed without error	   00%	   883		 -
#16  Short offline	   Completed without error	   00%	   844		 -
#17  Short offline	   Completed without error	   00%	   138		 -
#18  Extended offline	Completed without error	   00%		15		 -
#19  Conveyance offline  Completed without error	   00%		 0		 -
#20  Short offline	   Completed without error	   00%		 0		 -

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.

 

[PhilipS]

I had an issue with a bad SATA connector that degraded the pool. Once I found the fault and moved to a different port and the scrub cleaned up the errors, I ran the following command:

zpool clear tank

tank being my pool name.

 

[lukeren]

Just tried zpool clear, the disk failed during scrub. It's going back.

 

[lukeren]

The scrub just finished, the pool now looks like this.
Can anyone explain the 17.4GB that was repaired with 0 errors? I don't get that. If there was 0 errors, how come it failed?

Code:

  pool: Storage
 state: DEGRADED
status: One or more devices has experienced an unrecoverable error.  An
		attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
		using 'zpool clear' or replace the device with 'zpool replace'.
   see: http://illumos.org/msg/ZFS-8000-9P
  scan: scrub repaired 17.4G in 0 days 10:13:40 with 0 errors on Tue Apr 24 18:26:06 2018
config:

		NAME											STATE	 READ WRITE CKSUM
		Storage										 DEGRADED	 0	 0	 0
		  mirror-0									  DEGRADED	 0	 0	 0
			gptid/b3d78fb2-779a-11e7-85fe-941882081dee  ONLINE	   0	 0	 0
			gptid/b4990800-779a-11e7-85fe-941882081dee  DEGRADED	 0	 0  140K  too many errors

 

[Stux]

There were no errors while repairing the 17GB?

 

[lukeren]

That's what it says. 1/3 through the scrub it failed the disk though.
I don't really understand what's going on here.

I've pulled the disk and I'm running SeaTools on it now, if that passes, I'm going to run a badblock run on it.

 

[lukeren]

Well, the disk passed SeaTools tests and a badblock -ws -b 4096 run.
I've replaced it with a WD Red 8TB which is currently resilvering.

It's a bummer to have an 8TB drive just gathering dust, but I don't trust it and without faults I can't really return it.