Offline uncorrectable sectors

[ilaurens]

Hallo,

Recently I'm getting this errors:

Apr 1 18:11:05 server smartd[5286]: Device: /dev/ada0, 20 Currently unreadable (pending) sectors
Apr 1 18:11:05 server smartd[5286]: Device: /dev/ada0, 22 Offline uncorrectable sectors
Apr 1 18:41:05 server smartd[5286]: Device: /dev/ada0, 20 Currently unreadable (pending) sectors
Apr 1 18:41:05 server smartd[5286]: Device: /dev/ada0, 22 Offline uncorrectable sectors

Does anyone know more about it, can it cause problems? there are 2x WDC WD20EARX-008FB0 mirroring each other. Can this error be ignored?

Code: Select all

server:~# smartctl -A /dev/ada0
smartctl 6.0 2012-10-10 r3643 [FreeBSD 9.1-RELEASE amd64] (local build)
Copyright (C) 2002-12, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   184   183   021    Pre-fail  Always       -       5800
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       42
  5 Reallocated_Sector_Ct   0x0033   193   193   140    Pre-fail  Always       -       322
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       377
 10 Spin_Retry_Count        0x0032   100   253   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       42
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       14
193 Load_Cycle_Count        0x0032   200   200   000    Old_age   Always       -       196
194 Temperature_Celsius     0x0022   118   109   000    Old_age   Always       -       32
196 Reallocated_Event_Count 0x0032   199   199   000    Old_age   Always       -       1
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       20
198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       22
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       33

[dnar]

I just fixed a similar problem with one of my RAIDZ2 members.

The drive has detected back sectors. For the drive to mark these off, you must write zeros to the bad sectors.

IF the bad sectors have no files then the fix is easy, fill the remaining disk with a large file filled with zeros. ie. I did this: dd if=/dev/zero of=/mnt/MyPool/share/wayne/bigfile.zeros count=1234567

were count is your free space divided by 512 (assuming 512 blocks)

If the bad sectors contain files, then the easiest way is to pull the drive and low level format it, then add it back to N4F.

I low level format drives on a Linux box with: dd if=/dev/zero of=/dev/sdc bs=1M

This will completely fill the drive with zeros, you loose all data and the process takes hours.

With either method, Smart will show 0 errors, yet if they continue to return, ditch the drive.

I hope this makes sense. Above all, dont try these unless your data is backed up!!!!

[shakky4711]

Hi,

Only 377 hours and 322 damaged sectors and 20 pending sectors ????? Other values are bad likewise...
Wipe the drive when it is filled with private data and RMA this terrible piece of scrap

I would not trust this drive any more...

Shakky