So I'm planning on moving 2x 1TB drives that have been in a Raid 5 array for some time to an unraid box. I decided to preclear the drive for easy/quick adding however after nearly 23 hours, both have come back saying the drive has NOT been precleared successfully.

 

Disks in question are Samsung F1 drives.

==
== Disk /dev/sda has NOT been precleared successfully
== skip=200 count=200 returned 26333 instead of 00000 skip=400 count=200 returned 32771 instead of 00000
============================================================================
S.M.A.R.T. error count differences detected after pre-clear
note, some 'raw' values may change, but not be an indication of a problem
69c69
< 190 Airflow_Temperature_Cel 0x0022   085   059   000    Old_age   Always       -       15 (Lifetime Min/Max 11/15)
---
> 190 Airflow_Temperature_Cel 0x0022   071   059   000    Old_age   Always       -       29 (Lifetime Min/Max 11/31)
76c76
< 201 Soft_Read_Error_Rate    0x000a   253   253   000    Old_age   Always       -       0
---
> 201 Soft_Read_Error_Rate    0x000a   100   100   000    Old_age   Always       -       0
============================================================================

 

and

 Disk /dev/sdb has NOT been precleared successfully
== skip=121200 count=200 returned 60214 instead of 00000 skip=121400 count=200 returned 39172 instead of 00000 skip=121401 count=200 returned 39172 instead of 00000
============================================================================
S.M.A.R.T. error count differences detected after pre-clear
note, some 'raw' values may change, but not be an indication of a problem
59c59
<   7 Seek_Error_Rate         0x000f   253   253   051    Pre-fail  Always       -       0
---
>   7 Seek_Error_Rate         0x000f   100   100   051    Pre-fail  Always       -       0
69c69
< 190 Airflow_Temperature_Cel 0x0022   084   056   000    Old_age   Always       -       16 (Lifetime Min/Max 13/16)
---
> 190 Airflow_Temperature_Cel 0x0022   070   056   000    Old_age   Always       -       30 (Lifetime Min/Max 13/32)
76c76
< 201 Soft_Read_Error_Rate    0x000a   253   253   000    Old_age   Always       -       0
---
> 201 Soft_Read_Error_Rate    0x000a   100   100   000    Old_age   Always       -       0
============================================================================

 

Should I run pre-clear again? Not trust these drives?

 

Edit, syslog attached. Both drives were precleared at the same time using a cheap syba add-in card on a nforce 2 based test rig. If memory serves, nforce 2s were known to be a bit funny with unraid. Maybe I should hook these up in my main unraid box and try preclearing there.

 

 

syslog-12-20-TestRig.txt

Those errors are where the post-read read back something other than zeros in the post-read phase. 

 

There have been a few cases where a specific drive returned bad values...  but with more than one disk acting up I'd look to either the motherboard, disk-controller, power-supply, or memory as being suspect rather than the disks themselves.

 

Start by checking to make sure your memory is good.  Perform an overnight memory test on it.  Expect no errors. 

 

You can certainly run the pre-clear script on those drives in a different unRAID box.  I'll be willing to bet they will not have the same problems.

 

Joe L.

Thanks for the input Joe. Towards the end of writing my post I was coming to the same conclusion. I'll throw them in my main rig tonight and see what happens.

 

Edit: So I've added a Promise TX4 which is known to be good in my main unraid box and have 3 1TB drives preclearing now. Will report back in the ~24+ hours when they are done.