Preclear Question


kennelm

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All,

 

I ran the preclear script on a spare Seagate 1TB drive 3 times, and I consistently get these results:

 

================================================================== 1.15
=                unRAID server Pre-Clear disk /dev/sdh
=               cycle 1 of 1, partition start on sector 63
=
= 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: 28C, Elapsed Time:  9:19:22
========================================================================1.15
== ST31000528AS   6VP240NB
== Disk /dev/sdh has been successfully precleared
== with a starting sector of 63
============================================================================
** Changed attributes in files: /tmp/smart_start_sdh  /tmp/smart_finish_sdh
                ATTRIBUTE   NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS      RAW_VALUE
      Raw_Read_Error_Rate =   109     118            6        ok          23022699
          Seek_Error_Rate =    65      64           30        ok          3226584
         Spin_Retry_Count =   100     100           97        near_thresh 0
         End-to-End_Error =   100     100           99        near_thresh 0
  Airflow_Temperature_Cel =    72      73           45        ok          28
      Temperature_Celsius =    28      27            0        ok          28
   Hardware_ECC_Recovered =    45      44            0        ok          23022699
No SMART attributes are FAILING_NOW
0 sectors were pending re-allocation before the start of the preclear.
0 sectors were pending re-allocation after zero of disk in cycle 1 of 1.
0 sectors are pending re-allocation at the end of the preclear,
    the number of sectors pending re-allocation did not change.
1067 sectors had been re-allocated before the start of the preclear.
1067 sectors are re-allocated at the end of the preclear,
    the number of sectors re-allocated did not change.
root@Tower:/usr/local/emhttp#

 

It consistently reports those 1067 sectors.

 

Is this drive OK to use? 

 

Larry

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In theory if the number of reallocated sectors stays constant it is safe to use.    However I would be very wary with such a high number of reallocated sectors.  I personally would not use it the array although I might be happy to add it to use it as a backup disk.  If you do decide to use it in the array make sure that you have notifications turned on so that you get proactively alerted if the value degrades.

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In theory if the number of reallocated sectors stays constant it is safe to use.    However I would be very wary with such a high number of reallocated sectors.  I personally would not use it the array although I might be happy to add it to use it as a backup disk.  If you do decide to use it in the array make sure that you have notifications turned on so that you get proactively alerted if the value degrades.

 

Thanks.  I think I'll play it safe and use this drive for something else. 

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