Are one of the disks beginning to fail?

These messages appeared in the kern log file the other day:

Jun 21 22:06:06  enterprise kernel: [282015] (ada1:ahcich1:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61 18 38 ce 72 40 0b 00 00 00 00 00
Jun 21 22:06:06  enterprise kernel: [282015] (ada1:ahcich1:0:0:0): CAM status: Uncorrectable parity/CRC error
Jun 21 22:06:06  enterprise kernel: [282015] (ada1:ahcich1:0:0:0): Retrying command
Jun 21 22:06:06  enterprise kernel: [282015] (ada1:ahcich1:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61 60 58 ce 72 40 0b 00 00 00 00 00
Jun 21 22:06:06  enterprise kernel: [282015] (ada1:ahcich1:0:0:0): CAM status: Uncorrectable parity/CRC error
Jun 21 22:06:06  enterprise kernel: [282015] (ada1:ahcich1:0:0:0): Retrying command
Jun 21 22:06:06  enterprise kernel: [282015] (ada1:ahcich1:0:0:0): WRITE_FPDMA_QUEUED. ACB: 61 08 b8 cf 72 40 0b 00 00 00 00 00
Jun 21 22:06:06  enterprise kernel: [282015] (ada1:ahcich1:0:0:0): CAM status: Uncorrectable parity/CRC error
Jun 21 22:06:06  enterprise kernel: [282015] (ada1:ahcich1:0:0:0): Retrying command

The disk announces itself as:

ada1 at ahcich1 bus 0 scbus1 target 0 lun 0
ada1: <ST500DM002-1BD142 KC45> ATA-8 SATA 3.x device
ada1: 600.000MB/s transfers (SATA 3.x, UDMA6, PIO 8192bytes)
ada1: Command Queueing enabled
ada1: 476940MB (976773168 512 byte sectors: 16H 63S/T 16383C)
ada1: quirks=0x1<4K>
ada1: Previously was known as ad6

Elsewhere on the Net I’ve been reading about faulty SATA cables and insufficient power. I doubt the 850 W power supply is to blame, unless there’s a faulty wiring. Maybe it’s a faulty SATA cable.

ZFS still hasn’t detected anything wrong, neither when running the last scrub or in the meantime.

root@enterprise:~>zpool status enterprise_zroot
  pool: enterprise_zroot
 state: ONLINE
  scan: scrub repaired 0 in 0h37m with 0 errors on Thu Jun 20 05:40:49 2013
config:

        NAME              STATE     READ WRITE CKSUM
        enterprise_zroot  ONLINE       0     0     0
          mirror-0        ONLINE       0     0     0
            ada0p3        ONLINE       0     0     0
            ada1p3        ONLINE       0     0     0

errors: No known data errors

Nothing was revealed by running a short nor a long S.M.A.R.T. self-test. The result is presented below.

root@enterprise:~>smartctl -x /dev/ada1
smartctl 6.1 2013-03-16 r3800 [FreeBSD 9.1-STABLE amd64] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Seagate Barracuda 7200.14 (AF)
Device Model:     ST500DM002-1BD142
Serial Number:    [withheld]
LU WWN Device Id: 5 000c50 03f5711f2
Firmware Version: KC45
User Capacity:    500.107.862.016 bytes [500 GB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 4
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is:    Tue Jun 25 14:17:49 2013 CEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
AAM level is:     208 (intermediate), recommended: 208
APM feature is:   Unavailable
Rd look-ahead is: Enabled
Write cache is:   Enabled
ATA Security is:  Disabled, NOT FROZEN [SEC1]

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

General SMART Values:
Offline data collection status:  (0x82) Offline data collection activity
                                        was completed without error.
                                        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:                (  600) 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:        (   1) minutes.
Extended self-test routine
recommended polling time:        (  83) minutes.
Conveyance self-test routine
recommended polling time:        (   2) 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: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAGS    VALUE WORST THRESH FAIL RAW_VALUE
  1 Raw_Read_Error_Rate     POSR--   108   099   006    -    705688
  3 Spin_Up_Time            PO----   100   100   000    -    0
  4 Start_Stop_Count        -O--CK   100   100   020    -    27
  5 Reallocated_Sector_Ct   PO--CK   100   100   036    -    0
  7 Seek_Error_Rate         POSR--   083   060   030    -    231608890
  9 Power_On_Hours          -O--CK   086   086   000    -    12747
 10 Spin_Retry_Count        PO--C-   100   100   097    -    0
 12 Power_Cycle_Count       -O--CK   100   100   020    -    27
183 Runtime_Bad_Block       -O--CK   100   100   000    -    0
184 End-to-End_Error        -O--CK   100   100   099    -    0
187 Reported_Uncorrect      -O--CK   100   100   000    -    0
188 Command_Timeout         -O--CK   100   100   000    -    0 0 1
189 High_Fly_Writes         -O-RCK   100   100   000    -    0
190 Airflow_Temperature_Cel -O---K   069   053   045    -    31 (Min/Max 29/33)
194 Temperature_Celsius     -O---K   031   047   000    -    31 (0 19 0 0 0)
195 Hardware_ECC_Recovered  -O-RC-   045   032   000    -    705688
197 Current_Pending_Sector  -O--C-   100   100   000    -    0
198 Offline_Uncorrectable   ----C-   100   100   000    -    0
199 UDMA_CRC_Error_Count    -OSRCK   200   200   000    -    2
240 Head_Flying_Hours       ------   100   253   000    -    12747h+21m+34.951s
241 Total_LBAs_Written      ------   100   253   000    -    1783851522
242 Total_LBAs_Read         ------   100   253   000    -    3452084216
                            ||||||_ K auto-keep
                            |||||__ C event count
                            ||||___ R error rate
                            |||____ S speed/performance
                            ||_____ O updated online
                            |______ P prefailure warning

General Purpose Log Directory Version 1
SMART           Log Directory Version 1 [multi-sector log support]
Address    Access  R/W   Size  Description
0x00       GPL,SL  R/O      1  Log Directory
0x01           SL  R/O      1  Summary SMART error log
0x02           SL  R/O      5  Comprehensive SMART error log
0x03       GPL     R/O      5  Ext. Comprehensive SMART error log
0x06           SL  R/O      1  SMART self-test log
0x07       GPL     R/O      1  Extended self-test log
0x09           SL  R/W      1  Selective self-test log
0x10       GPL     R/O      1  NCQ Command Error log
0x11       GPL     R/O      1  SATA Phy Event Counters
0x21       GPL     R/O      1  Write stream error log
0x22       GPL     R/O      1  Read stream error log
0x80-0x9f  GPL,SL  R/W     16  Host vendor specific log
0xa1       GPL,SL  VS      20  Device vendor specific log
0xa2       GPL     VS    2248  Device vendor specific log
0xa8       GPL,SL  VS     129  Device vendor specific log
0xa9       GPL,SL  VS       1  Device vendor specific log
0xab       GPL     VS       1  Device vendor specific log
0xb0       GPL     VS    2928  Device vendor specific log
0xbd       GPL     VS     252  Device vendor specific log
0xbe-0xbf  GPL     VS   65535  Device vendor specific log
0xc0       GPL,SL  VS       1  Device vendor specific log
0xe0       GPL,SL  R/W      1  SCT Command/Status
0xe1       GPL,SL  R/W      1  SCT Data Transfer

SMART Extended Comprehensive Error Log Version: 1 (5 sectors)
No Errors Logged

SMART Extended Self-test Log Version: 1 (1 sectors)
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%     12747         -
# 2  Short offline       Completed without error       00%     12745         -
# 3  Extended offline    Completed without error       00%      3721         -
# 4  Short offline       Completed without error       00%      3719         -
# 5  Extended offline    Completed without error       00%      3363         -
# 6  Short offline       Completed without error       00%      3361         -
# 7  Extended offline    Completed without error       00%      3000         -
# 8  Short offline       Completed without error       00%      2999         -
# 9  Extended offline    Completed without error       00%      1451         -
#10  Extended offline    Completed without error       00%      1311         -
#11  Extended offline    Completed without error       00%       613         -
#12  Extended offline    Completed without error       00%       550         -
#13  Short offline       Completed without error       00%       548         -
#14  Extended offline    Completed without error       00%       260         -
#15  Conveyance offline  Completed without error       00%       134         -
#16  Extended offline    Completed without error       00%        14         -
#17  Short offline       Completed without error       00%        12         -

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.

SCT Status Version:                  3
SCT Version (vendor specific):       522 (0x020a)
SCT Support Level:                   1
Device State:                        Active (0)
Current Temperature:                    31 Celsius
Power Cycle Min/Max Temperature:     29/34 Celsius
Lifetime    Min/Max Temperature:     19/47 Celsius
Under/Over Temperature Limit Count:   0/0
SCT Temperature History Version:     2
Temperature Sampling Period:         1 minute
Temperature Logging Interval:        59 minutes
Min/Max recommended Temperature:     14/55 Celsius
Min/Max Temperature Limit:           10/60 Celsius
Temperature History Size (Index):    128 (72)

Index    Estimated Time   Temperature Celsius
  73    2013-06-20 08:51    30  ***********
 ...    ..(  6 skipped).    ..  ***********
  80    2013-06-20 15:44    30  ***********
  81    2013-06-20 16:43    31  ************
 ...    ..(  6 skipped).    ..  ************
  88    2013-06-20 23:36    31  ************
  89    2013-06-21 00:35    30  ***********
 ...    ..( 25 skipped).    ..  ***********
 115    2013-06-22 02:09    30  ***********
 116    2013-06-22 03:08    32  *************
 117    2013-06-22 04:07    32  *************
 118    2013-06-22 05:06    30  ***********
 ...    ..( 27 skipped).    ..  ***********
  18    2013-06-23 08:38    30  ***********
  19    2013-06-23 09:37    31  ************
  20    2013-06-23 10:36    30  ***********
 ...    ..( 25 skipped).    ..  ***********
  46    2013-06-24 12:10    30  ***********
  47    2013-06-24 13:09    29  **********
  48    2013-06-24 14:08    29  **********
  49    2013-06-24 15:07    29  **********
  50    2013-06-24 16:06    30  ***********
 ...    ..(  9 skipped).    ..  ***********
  60    2013-06-25 01:56    30  ***********
  61    2013-06-25 02:55    32  *************
  62    2013-06-25 03:54    30  ***********
 ...    ..(  5 skipped).    ..  ***********
  68    2013-06-25 09:48    30  ***********
  69    2013-06-25 10:47    29  **********
  70    2013-06-25 11:46    30  ***********
  71    2013-06-25 12:45    32  *************
  72    2013-06-25 13:44    31  ************

SCT Error Recovery Control:
           Read: Disabled
          Write: Disabled

Device Statistics (GP Log 0x04) not supported

SATA Phy Event Counters (GP Log 0x11)
ID      Size     Value  Description
0x000a  2           43  Device-to-host register FISes sent due to a COMRESET
0x0001  2            1  Command failed due to ICRC error
0x0003  2            0  R_ERR response for device-to-host data FIS
0x0004  2            1  R_ERR response for host-to-device data FIS
0x0006  2            0  R_ERR response for device-to-host non-data FIS
0x0007  2            0  R_ERR response for host-to-device non-data FIS

The S.M.A.R.T. attribute 199 has increased from 1 to 2 during the last year and a half. I better keep an eye on this value.