Preclear failed - more information?


PeterB

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I am running preclear (gfjardim's plugin) to test two new drives for use as parity drives.  One of the drives has just produced this:

############################################################################################################################
#                                                                                                                          #
#                                        unRAID Server Preclear of disk V9GXAXWL                                           #
#                                       Cycle 1 of 1, partition start on sector 64.                                        #
#                                                                                                                          #
#                                                                                                                          #
#   Step 1 of 5 - Pre-read verification:                                                   [8:28:17 @ 196 MB/s] SUCCESS    #
#   Step 2 of 5 - Zeroing the disk:                                                        [8:11:26 @ 203 MB/s] SUCCESS    #
#   Step 3 of 5 - Writing unRAID's Preclear signature:                                                          SUCCESS    #
#   Step 4 of 5 - Verifying unRAID's Preclear signature:                                                        SUCCESS    #
#   Step 5 of 5 - Post-Read verification:                                                                          FAIL    #
#                                                                                                                          #
#                                                                                                                          #
#                                                                                                                          #
#                                                                                                                          #
#                                                                                                                          #
#                                                                                                                          #
#                                                                                                                          #
############################################################################################################################
#                              Cycle elapsed time: 19:58:40 | Total elapsed time: 19:58:40                                 #
############################################################################################################################


############################################################################################################################
#                                                                                                                          #
#                                        S.M.A.R.T. Status (device type: default)                                          #
#                                                                                                                          #
#                                                                                                                          #
#   ATTRIBUTE                    INITIAL  STATUS                                                                           #
#   5-Reallocated_Sector_Ct      0        -                                                                                #
#   9-Power_On_Hours             0        -                                                                                #
#   194-Temperature_Celsius      39       -                                                                                #
#   196-Reallocated_Event_Count  0        -                                                                                #
#   197-Current_Pending_Sector   0        -                                                                                #
#   198-Offline_Uncorrectable    0        -                                                                                #
#   199-UDMA_CRC_Error_Count     0        -                                                                                #
#                                                                                                                          #
#                                                                                                                          #
#                                                                                                                          #
#                                                                                                                          #
#                                                                                                                          #
############################################################################################################################
#   SMART overall-health self-assessment test result: PASSED                                                               #
############################################################################################################################

--> FAIL: Post-Read verification failed. Your drive is not zeroed.

 Is the system log the only way to get any more information about the failure?

 

I attach extracts from the system log file for all the relevant entries I can find.

PreclearLogEntries

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8 minutes ago, trurl said:

Post-read verification failed can be caused by bad RAM. Happened to me.

So, is there any way I can determine what caused the failure?

Do I just re-run the Preclear?

 

The other drive is still running the Post-Read, at 58%.

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Here's an interesting thought ....

Part of the reason for urgent replacement of parity drives is that my Parity2 drive appears to have failed.  The parity drive which has failed (a relatively new drive), and this new drive which has failed Preclear are both on the same SATA disk interface card - a two port generic Asmedia device, purchased from China.  Perhaps the issue is with the SATA interface?

I think I should try moving both of these drives to other SATA ports.

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