I recently removed and replaced a disk from my array that had growing UDMA_CRC_ERROR_Count.  With the disk now unassigned I could dispose it.  Instead I thought I'd replace the SATA cable, run a pre-clear, learn a few things, and decide what to do afterwards. 

 

The disk did not complete pre-clear.  It appears like it had no I/O at all.   Is this what a pre-clear fail is supposed to look like?

 

Here's a portion of the log file: 

Nov 06 11:10:41 preclear_disk_S377J9FGA01094_634: Pre-read: pre-read verification started 5 of 5 retries...
Nov 06 11:10:41 preclear_disk_S377J9FGA01094_634: Continuing disk read from byte 124670705664
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records out
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0 bytes copied, 246.101 s, 0.0 kB/s
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: dd: error reading '/dev/sdf': Input/output error
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records in
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records out
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0 bytes copied, 246.101 s, 0.0 kB/s
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: dd: error reading '/dev/sdf': Input/output error
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records in
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records out
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0 bytes copied, 246.101 s, 0.0 kB/s
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: dd: error reading '/dev/sdf': Input/output error
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records in
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records out
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0 bytes copied, 246.101 s, 0.0 kB/s
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: dd: error reading '/dev/sdf': Input/output error
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records in
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records out
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0 bytes copied, 246.101 s, 0.0 kB/s
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: dd: error reading '/dev/sdf': Input/output error
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records in
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records out
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0 bytes copied, 246.102 s, 0.0 kB/s
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: dd: error reading '/dev/sdf': Input/output error
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records in
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records out
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0 bytes copied, 246.102 s, 0.0 kB/s
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: dd: error reading '/dev/sdf': Input/output error
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records in
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0+0 records out
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-Read: dd output: 0 bytes copied, 246.102 s, 0.0 kB/s
Nov 06 11:15:00 preclear_disk_S377J9FGA01094_634: Pre-read: pre-read verification failed!
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.: Error:
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.:
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.: ATTRIBUTE                  INITIAL    NOW    STATUS
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.: Reallocated_Sector_Ct      0          -
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.: Power_On_Hours             24668      -
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.: Temperature_Celsius        33         -
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.: Reallocated_Event_Count    0          -
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.: Current_Pending_Sector     0          -
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.: Offline_Uncorrectable      0          -
Nov 06 11:15:02 preclear_disk_S377J9FGA01094_634: S.M.A.R.T.: UDMA_CRC_Error_Count       439        -

56 minutes ago, stolat01 said:

UDMA_CRC_ERROR_Count

This indicates a bad connection

 

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