Do I have a failing disk

[gerhard911]

After upgrading my server from beta 13 to RC4 (edit-it was 5.0-RC8a) I ran a parity check. No sync errors were found but immediately after the check finished unRaid red balled disk 7 (of nine). I left the disk in the server but removed it from the array, rebooted the server and restarted the array with disk 7 unassigned. The array came up in unprotected mode and looked fine from a data standpoint.

 

I stopped the array and attempted to reassign the original disk 7 but it showed as unformatted and unRaid had the Format option greyed out. So I decided to run a preclear on the disk (it had been precleared before being initially added to the array). Here are the results:

============================================================= 1.12

=                unRAID server Pre-Clear disk /dev/sde

=              cycle 1 of 1, partition start on sector 1

= Disk Pre-Clear-Read completed                                DONE

= Step 1 of 10 - Copying zeros to first 2048k bytes            DONE

= Step 2 of 10 - Copying zeros to remainder of disk to clear it DONE

= Step 3 of 10 - Disk is now cleared from MBR onward.          DONE

= Step 4 of 10 - Clearing MBR bytes for partition 2,3 & 4      DONE

= Step 5 of 10 - Clearing MBR code area                        DONE

= Step 6 of 10 - Setting MBR signature bytes                    DONE

= Step 7 of 10 - Setting partition 1 to precleared state        DONE

= Step 8 of 10 - Notifying kernel we changed the partitioning  DONE

= Step 9 of 10 - Creating the /dev/disk/by* entries            DONE

= Step 10 of 10 - Verifying if the MBR is cleared.              DONE

= Disk Post-Clear-Read completed                                DONE

Disk Temperature: 37C, Elapsed Time:  62:40:10

========================================================================1.12

==  WDC WD30EZRX-00MMMB0    WD-WCAWZ2393453

== Disk /dev/sde has been successfully precleared

== with a starting sector of 1

============================================================================

** Changed attributes in files: /tmp/smart_start_sde  /tmp/smart_finish_sde

                ATTRIBUTE  NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS      RAW_VALUE

      Raw_Read_Error_Rate =  172    200          51        ok          28610

            Spin_Up_Time =  253    225          21        ok          3108

          Seek_Error_Rate =  100    200            0        ok          0

      Temperature_Celsius =  115    116            0        ok          37

No SMART attributes are FAILING_NOW

 

0 sectors were pending re-allocation before the start of the preclear.

6 sectors were pending re-allocation after pre-read in cycle 1 of 1.

0 sectors were pending re-allocation after zero of disk in cycle 1 of 1.

1 sector is pending re-allocation at the end of the preclear,

    a change of 1 in the number of sectors pending re-allocation.

0 sectors had been re-allocated before the start of the preclear.

0 sectors are re-allocated at the end of the preclear,

    the number of sectors re-allocated did not change.

 

I am concerned about the sectors pending reallocation. I have a second preclear running now but wanted to get some feedback from those with more knowledge. TIA

 

 

[Joe L.]

I would use the most recent version of the preclear script.  You are using an older version.  It may not write a proper preclear signature on drives > 2.2TB.

 

Now, that will not be an issue when re-constructing an existing drive, but it will be an issue if adding a disk to an existing array..

 

A sector pending re-allocation that shows up in the post-read is an issue to be dealt with by an additional preclear.  If the disk keeps on having additional sectors pending re-allocation, it is a candidate for RMA, even if not yet failed.

[gerhard911]

Thanks for the response, Joe. I restarted the second preclear (it was still in pre-read) using v1.13.

 

So where my first preclear ended with "1 sector is pending re-allocation at the end of the preclear" I am looking for the next run to show "0 sectors pending re-allocation at the end of the preclear". Fingers crossed.

 

edit:

 

I just realized I indicated I upgraded to unRaid 5.0-RC4. I have no idea where that came from, it was RC8a. I did not try any of the previous release candidates.