One of my unRaid machines has a disk with a little red X -- I don't know how long that has been there I just found it this morning.

 

The disk with the X is the newest HD in the array -- it is a WD 6TB Red and less than 3 months old.

 

I ran both the short and the long test and there are no errors reported.

 

I then tried to rebuild the array by taking the drive offline and then reassigning it as a new drive -- as soon as I start the reconstruction process there is a bunch of errors.

 

Test the drive again just with the short test -- again no errors.

 

What am I doing wrong? 

Check the SATA and power cables to the disks. If that doesn't help post your diagnostics. https://lime-technology.com/forum/index.php?topic=39257.0

 

The case has 4 trays -- I thought it might be the connection as well so I took the drive out but problem persists. I guess it could be something with connection on that tray.

 

This is the short test results. I'll start the long test

 

=== 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: 		( 7424) 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: 	 ( 727) 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   100   253   021    Pre-fail  Always       -       0
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       4
  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   099   099   000    Old_age   Always       -       1143
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       -       2
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       0
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       387
194 Temperature_Celsius     0x0022   119   114   000    Old_age   Always       -       33
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       -       2
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%      1143         -
# 2  Short offline       Aborted by host               90%      1140         -
# 3  Short offline       Completed without error       00%      1140         -
# 4  Extended offline    Completed without error       00%      1139         -
# 5  Short offline       Completed without error       00%      1126         -

 

 

If that doesn't help post your diagnostics.

 

 

Sorry I thought the diagnostics was just the SMART test. I read the link and now I realize it is more.

 

After reading John_M's suggestion I tried the resetting all the connections again even though I had already done that. The drive is 48% reconstructed which is much further into the process then it ever got before. Hopefully it is just a connection issue. If the issues returns I'll post the diagnostics following the instructions in the link provided.