SMART shows Current_Pending_Sector greater zero but no errors

[adalbert]

Hi there,

WebUI shows an alert for /dev/ada0: Device: /dev/ada0, 3 Currently unreadable (pending) sectors.

I ran a long / extended SMART test for that disk. The result showed no errors.
After the test run i scrubed the whole pool -> no known data errors, pool is ONLINE.

A couple of hours later i ran another SMART long test. This is the result:

Code:

[root@midgard] ~# smartctl -a /dev/ada0
smartctl 6.3 2014-07-26 r3976 [FreeBSD 9.3-RELEASE-p25 amd64] (local build)
Copyright (C) 2002-14, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Caviar Green
Device Model:     WDC WD15EADS-00P8B0
Serial Number:    WD-WMAVU0093944
LU WWN Device Id: 5 0014ee 0017c9170
Firmware Version: 01.00A01
User Capacity:    1,500,301,910,016 bytes [1.50 TB]
Sector Size:      512 bytes logical/physical
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS (minor revision not indicated)
SATA Version is:  SATA 2.6, 3.0 Gb/s
Local Time is:    Sat Feb 13 20:45:33 2016 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x84) Offline data collection activity
                                        was suspended by an interrupting command from host.
                                        Auto Offline Data Collection: Enabled.
Self-test execution status:      (   0) The previous self-test routine completed
                                        without error or no self-test has ever
                                        been run.
Total time to complete Offline
data collection:                (32400) seconds.
Offline data collection
capabilities:                    (0x7b) SMART execute Offline immediate.
                                        Auto Offline data collection on/off support.
                                        Suspend Offline collection upon new
                                        command.
                                        Offline surface scan supported.
                                        Self-test supported.
                                        Conveyance Self-test supported.
                                        Selective Self-test supported.
SMART capabilities:            (0x0003) Saves SMART data before entering
                                        power-saving mode.
                                        Supports SMART auto save timer.
Error logging capability:        (0x01) Error logging supported.
                                        General Purpose Logging supported.
Short self-test routine
recommended polling time:        (   2) minutes.
Extended self-test routine
recommended polling time:        ( 370) minutes.
Conveyance self-test routine
recommended polling time:        (   5) minutes.
SCT capabilities:              (0x303f) SCT Status supported.
                                        SCT Error Recovery Control supported.
                                        SCT Feature Control supported.
                                        SCT Data Table supported.

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   171   169   021    Pre-fail  Always       -       6408
  4 Start_Stop_Count        0x0032   087   087   000    Old_age   Always       -       13409
  5 Reallocated_Sector_Ct   0x0033   195   195   140    Pre-fail  Always       -       35
  7 Seek_Error_Rate         0x002e   100   253   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   075   075   000    Old_age   Always       -       18599
10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
12 Power_Cycle_Count       0x0032   098   098   000    Old_age   Always       -       2287
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       540
193 Load_Cycle_Count        0x0032   162   162   000    Old_age   Always       -       115983
194 Temperature_Celsius     0x0022   114   094   000    Old_age   Always       -       36
196 Reallocated_Event_Count 0x0032   198   198   000    Old_age   Always       -       2
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       4
198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       0
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      -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%     18599         -
# 2  Short offline       Completed without error       00%     18597         -
# 3  Extended offline    Completed without error       00%     18595         -
# 4  Short offline       Completed without error       00%     18590         -
# 5  Extended offline    Completed without error       00%     18562         -

SMART Selective self-test log data structure revision number 1
SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

Still no errors ("Completed without error").

Code:

[root@midgard] ~# dmesg | tail -n 10
epair0b: link state changed to UP
re0: link state changed to DOWN
epair0a: promiscuous mode enabled
ng_ether_ifnet_arrival_event: can't re-name node epair0b
re0: link state changed to UP
ahcich0: Timeout on slot 16 port 0
ahcich0: is 00000000 cs 00010000 ss 00000000 rs 00010000 tfd c0 serr 00000000 cmd 0000d017
(ada0:ahcich0:0:0:0): FLUSHCACHE48. ACB: ea 00 00 00 00 40 00 00 00 00 00 00
(ada0:ahcich0:0:0:0): CAM status: Command timeout
(ada0:ahcich0:0:0:0): Retrying command

So do i need to replace that disk with a new one? This hdd is part of a mirror, not a raid(z).

Thanks for our help.

 

[SweetAndLow]

Your drive is on its way out. Make sure you have another ready because you will probably have to replace it soonish but not required just yet.

 

[Robert Trevellyan]

Still no errors ("Completed without error").

Completing a SMART test without error is independent of SMART monitoring status. In your case, attributes #5, #196, and #197 are cause for concern. The story they tell together is that 35 sectors were already remapped in the past, in two separate reallocation events, and there are more reallocations pending. I would replace the drive.