[6.9.2] Extremely Slow Preclear Post-Read

[DiagnostiX]

I recently bought two 8TB Toshiba NAS drives and upon installing them started to preclear them both. They both ran pretty much in parallel for pre-read and write taking around 10 hours for each phase. But when the post-read started one finished in around 10 hours again, but the other drive started to read slower and slower. Speeds have dropped to 2MB/s. It is at 76% and has been running for 23 hours. SMART doesn't seem to report any issues but I can't get the process to complete any quicker. Is this an issue with the drive? Any help would be greatly appreciated.

 

####################################################################################################
#                            Unraid Server Preclear of disk 8120A00CFA3H                           #
#                            Cycle 1 of 1, partition start on sector 64.                           #
#                                                                                                  #
#   Step 1 of 5 - Pre-read verification:                  [10:52:04 @ 204 MB/s] SUCCESS            #
#   Step 2 of 5 - Zeroing the disk:                       [10:53:29 @ 204 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 in progress: (76% Done)                                                #
#                                                                                                  #
#   ** Time elapsed: 23:13:43 | Current speed: 3 MB/s | Average speed: 72 MB/s                     #
#                                                                                                  #
####################################################################################################
#       Cycle elapsed time: 44:59:36 | Total elapsed time: 44:59:36                                #
####################################################################################################

####################################################################################################
#   S.M.A.R.T. Status (device type: default)                                                       #
#                                                                                                  #
#   ATTRIBUTE                   INITIAL STATUS                                                     #
#   Reallocated_Sector_Ct       0       -                                                          #
#   Power_On_Hours              0       -                                                          #
#   Temperature_Celsius         26      -                                                          #
#   Reallocated_Event_Count     0       -                                                          #
#   Current_Pending_Sector      0       -                                                          #
#   Offline_Uncorrectable       0       -                                                          #
#   UDMA_CRC_Error_Count        0       -                                                          #
#                                                                                                  #
####################################################################################################
#   SMART overall-health self-assessment test result: PASSED                                       #
####################################################################################################

 

[ChatNoir]

1 hour ago, DiagnostiX said:

Any help would be greatly appreciated.

Your diagnostics might show something. Please attach the full zip in your next post.

[DiagnostiX]

50 minutes ago, ChatNoir said:

Your diagnostics might show something. Please attach the full zip in your next post.

 

Thanks, I've attached the zip.

tower-diagnostics-20220404-1520.zip