Help me understand Why unraid says my disk is dead


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Hi!

 

First i would like to say i'm a beginner and i'm no authority on the subject.

I just find it hard do understand why unraid says the disk is faulty.

 

So i have this array on my home file server which use a bunch of miss match disks that i had just lying around.

Few days ago unraid told me one of my disk was disabled and the content was emulated, no big deal, it's only bound to happen I told myself.

 

I was a bit surprised when it turned out to be the most recent disk i had added to the array, a disk that only weeks ago I had used, and tested with the best of my knowledge. So i decided to investigate a bit more, ran a quick SMART Test, which the disk passed, ran a full SMART test, which it also passed (See at the bottom for the SMART Report). I then removed the disk and stopped the array while I get a new disk (For fear of loosing data). Since the smart report came back with a pass I decided to test the disk for a few days as an external hard drive thinking it might fail under working conditions. To my surprise however, I never encountered any problems, so i decided to format the disk and put it back in the array. Unraid recognized the disk and started rebuilding the disk using the parity, at 70% however it stopped and one again, said the device was faulty. I've since swapped Sata cables and unraid still continue to tell me the disk is faulty.

 

Is there anything I can do? i'm not saying unraid is wrong and the device hasn't failed, but it seems if I can use it as an external drive without any problem and the SMART status is ok the disk should be fine?

 

Quote

smartctl 6.5 2016-05-07 r4318 [x86_64-linux-4.4.19-unRAID] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Caviar Blue (SATA)
Device Model:     WDC WD5000AAKS-402AA0
Serial Number:    WD-WCAWFD953035
LU WWN Device Id: 5 0014ee 159a95845
Firmware Version: 06.01D02
User Capacity:    500,107,862,016 bytes [500 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    7200 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS (minor revision not indicated)
SATA Version is:  SATA 2.6, 3.0 Gb/s
Local Time is:    Fri Aug  4 09:18:17 2017 EDT
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:         ( 8400) 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:      ( 100) minutes.
Conveyance self-test routine
recommended polling time:      (   5) minutes.
SCT capabilities:            (0xb037)    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       -       0
  3 Spin_Up_Time            0x0027   143   140   021    Pre-fail  Always       -       3833
  4 Start_Stop_Count        0x0032   094   094   000    Old_age   Always       -       6767
  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   072   072   000    Old_age   Always       -       20501
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   096   096   000    Old_age   Always       -       4096
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       89
193 Load_Cycle_Count        0x0032   198   198   000    Old_age   Always       -       6677
194 Temperature_Celsius     0x0022   103   084   000    Old_age   Always       -       40
195 Hardware_ECC_Recovered  0x0036   200   200   000    Old_age   Always       -       0
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   200   200   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       223810
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  Extended offline    Completed without error       00%     20492         -
# 2  Short offline       Completed without error       00%     20488         -

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.

 

Edited by sloob
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Hi!
 
First i would like to say i'm a beginner and i'm no authority on the subject.
I just find it hard do understand why unraid says the disk is faulty.
 
So i have this array on my home file server which use a bunch of miss match disks that i had just lying around.
Few days ago unraid told me one of my disk was disabled and the content was emulated, no big deal, it's only bound to happen I told myself.
 
I was a bit surprised when it turned out to be the most recent disk i had added to the array, a disk that only weeks ago I had used, and tested with the best of my knowledge. So i decided to investigate a bit more, ran a quick SMART Test, which the disk passed, ran a full SMART test, which it also passed (See at the bottom for the SMART Report). I then removed the disk and stopped the array while I get a new disk (For fear of loosing data). Since the smart report came back with a pass I decided to test the disk for a few days as an external hard drive thinking it might fail under working conditions. To my surprise however, I never encountered any problems, so i decided to format the disk and put it back in the array. Unraid recognized the disk and started rebuilding the disk using the parity, at 70% however it stopped and one again, said the device was faulty. I've since swapped Sata cables and unraid still continue to tell me the disk is faulty.
 
Is there anything I can do? i'm not saying unraid is wrong and the device hasn't failed, but it seems if I can use it as an external drive without any problem and the SMART status is ok the disk should be fine?
Post your diagnostics before you reboot

Sent from my LG-D852 using Tapatalk

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4 minutes ago, Squid said:

Post your diagnostics before you reboot

Sent from my LG-D852 using Tapatalk
 

I'm not 100% sure what that means, I'm sorry.

 

I downloaded the Diagnostic .Zip but there is a bunch of stuff in there, which file should i post?

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3 minutes ago, johnnie.black said:

199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       223810

Replace the SATA cable.

You think i should do it again? because i've swapped the hard drive tray with another to see if it was the backplane/cables and it gave me the same drive as faulty

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3 minutes ago, sloob said:

and it gave me the same drive as faulty

 

That's normal, once a disk is disabled it remains disable until you replace or re-enable it, rebuild to the same disk and check if that attribute doesn't increase, an increase of 2 or more errors means there's still a problem.

 

https://wiki.lime-technology.com/Troubleshooting#Re-enable_the_drive

Edited by johnnie.black
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23 minutes ago, johnnie.black said:

 

That's normal, once a disk is disabled it remains disable until you replace or re-enable it, rebuild to the same disk and check if that attribute doesn't increase, an increase of 2 or more errors means there's still a problem.

 

https://wiki.lime-technology.com/Troubleshooting#Re-enable_the_drive

The array is now rebuilding the disk, let's see if it fails this time.. Thanks for the help guys

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