When should I be concern with the SMART results?

[codenamezero]

Hi guys,

Kind a new here, I'd like to know when do i need to worry about the health of my disk and when I should replace it (possibly before it fails)?

I ran the command on one of my disk, but not really sure how to interpret the result.

Code:

freenas# smartctl -a /dev/ada1
smartctl 5.40 2010-10-16 r3189 [FreeBSD 8.2-RELEASE-p1 amd64] (local build)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net

=== START OF INFORMATION SECTION ===
Device Model:     ST2000DL003-9VT166
Serial Number:    5YD33RP5
Firmware Version: CC32
User Capacity:    2,000,398,934,016 bytes
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   8
ATA Standard is:  ATA-8-ACS revision 4
Local Time is:    Sun Dec  4 13:54:12 2011 EST
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:  (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:                 ( 623) 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:        ( 255) minutes.
Conveyance self-test routine
recommended polling time:        (   2) minutes.
SCT capabilities:              (0x30b7) SCT Status 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          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x000f   119   099   006    Pre-fail  Always       -       226580152
  3 Spin_Up_Time            0x0003   092   092   000    Pre-fail  Always       -       0
  4 Start_Stop_Count        0x0032   100   100   020    Old_age   Always       -       41
  5 Reallocated_Sector_Ct   0x0033   100   100   036    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x000f   065   060   030    Pre-fail  Always       -       3456725
  9 Power_On_Hours          0x0032   098   098   000    Old_age   Always       -       2254
 10 Spin_Retry_Count        0x0013   100   100   097    Pre-fail  Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   020    Old_age   Always       -       49
183 Runtime_Bad_Block       0x0032   100   100   000    Old_age   Always       -       0
184 End-to-End_Error        0x0032   100   100   099    Old_age   Always       -       0
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
188 Command_Timeout         0x0032   100   100   000    Old_age   Always       -       0
189 High_Fly_Writes         0x003a   099   099   000    Old_age   Always       -       1
190 Airflow_Temperature_Cel 0x0022   067   060   045    Old_age   Always       -       33 (Min/Max 28/39)
191 G-Sense_Error_Rate      0x0032   100   100   000    Old_age   Always       -       0
192 Power-Off_Retract_Count 0x0032   100   100   000    Old_age   Always       -       28
193 Load_Cycle_Count        0x0032   100   100   000    Old_age   Always       -       46
194 Temperature_Celsius     0x0022   033   040   000    Old_age   Always       -       33 (0 25 0 0)
195 Hardware_ECC_Recovered  0x001a   023   007   000    Old_age   Always       -       226580152
197 Current_Pending_Sector  0x0012   100   100   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0010   100   100   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x003e   200   200   000    Old_age   Always       -       0
240 Head_Flying_Hours       0x0000   100   253   000    Old_age   Offline      -       171519518968015
241 Total_LBAs_Written      0x0000   100   253   000    Old_age   Offline      -       369852950
242 Total_LBAs_Read         0x0000   100   253   000    Old_age   Offline      -       3759858796

 

[kbarb]

I found this post on a search for something else, but I have a few links that might help.
I have to say I find the SMART output a bit mysterious and unnecessarily cryptic but remembered an article I read - four pages worth actually:

Monitoring Hard Disks with SMART
http://www.linuxjournal.com/magazine/monitoring-hard-disks-smart

Also the Wikipedia article has a nice list of all the output attributes, their meaning, and also highlights in red the ones that are actually of significance.
http://en.wikipedia.org/wiki/S.M.A.R.T.

If you figure anything out please let us know.

 

[joeschmuck]

Your drive appears to have a lot of read errors (looking at items 1, 7, 195) but the problem is this drive is not in in this version of smartd so those values could be incorrect but I doubt it. The fly head hours is of course way off. You could run the following command: smartctl -t s /dev/ada1 then wait about 2 minutes and run smartctl -a /dev/ada1 and see what the test results were. You could run a long test after that if you don't see a failure, use the same command above but replace the "s" with a "l" (lower case L) and come back a few hours later and check it again.

If you are running this in a Zpool, run a scrub and see if any failures occur. If you doubt the drive, replace it. SMART testing can only tell you so much and typically, in my experience, tells you after you have a serious failure.

Hope this helps some.