Re: UC smartctl: is my disc dying?

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I've seen similar cases where a USB drive appears to fail but the SMART
reports success.  The most recent was a 500 GB disk which had internally
a Seagate Barracuda SATA drive.  It appeared to work well until I sent
it
a largish (7GB) tarball.  As well as SMART I ran a surface check and
exercise,
all passed.  The tar kept failing.

I can't test further, the disk has been broken up for destruction, but I
wonder if the problem is the disk or the USB/SATA conversion board?  If
there is some sort of buffer in the interface that is filling, then the
behaviour you describe makes sense.   I have no proof or details, it's
just a thought that occurred to me as I was breaking it up.

>-----Original Message-----
>From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On
>Behalf Of Bob Hepple
>Sent: 27 January 2014 08:11
>To: centos@xxxxxxxxxx
>Subject:  smartctl: is my disc dying?
>
>I've got a 1Tb USB disc that appears to be dying - eg it took about 10
days
>(!) to run 'badblocks -nsv /dev/sdc' and it only did less than 2% in
that time.
>Read access became _really_ slow.
>
>So there's definitely something amiss and I've got it offline.
>
>There's no drama about the content as I have other backups and I'm
resigned
>to junking the thing, but I'm curious about the fact that smartctl
doesn't seem
>to report any errors. I tried a short and a long test but nothing in
there seems
>to be alarming - in fact it says PASSED!! - but the output is pretty
opaque and
>maybe I've been foxed by ambiguity. Anyone care to comment on it?
>
>Here it is:
>
>[root@nina bhepple]# smartctl /dev/sdc -a smartctl 5.43 2012-06-30
r3573
>[i686-linux-2.6.32-358.23.2.el6.i686] (local
>build)
>Copyright (C) 2002-12 by Bruce Allen,
http://smartmontools.sourceforge.net
>
>=== START OF INFORMATION SECTION ===
>Model Family:     Western Digital Caviar Green
>Device Model:     WDC WD10EAVS-00M4B0
>Serial Number:    WD-WCAV5A574187
>LU WWN Device Id: 5 0014ee 2aef3c352
>Firmware Version: 01.00A01
>User Capacity:    1,000,204,886,016 bytes [1.00 TB]
>Sector Size:      512 bytes logical/physical
>Device is:        In smartctl database [for details use: -P show]
>ATA Version is:   8
>ATA Standard is:  Exact ATA specification draft version not indicated
>Local Time is:    Mon Jan 27 17:43:33 2014 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:  (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:                (18780) 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:        ( 217) minutes.
>Conveyance self-test routine
>recommended polling time:        (   5) minutes.
>SCT capabilities:              (0x3037) SCT Status 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   114   107   021    Pre-fail
Always
>   -       7283
>  4 Start_Stop_Count        0x0032   091   091   000    Old_age
Always
>   -       9764
>  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail
Always
>   -       0
>  7 Seek_Error_Rate         0x002e   200   200   000    Old_age
Always
>   -       0
>  9 Power_On_Hours          0x0032   080   080   000    Old_age
Always
>   -       14907
> 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   100   100   000    Old_age
Always
>   -       181
>192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age
Always
>   -       82
>193 Load_Cycle_Count        0x0032   186   186   000    Old_age
Always
>   -       44531
>194 Temperature_Celsius     0x0022   098   083   000    Old_age
Always
>   -       49
>196 Reallocated_Event_Count 0x0032   200   200   000    Old_age
Always
>   -       0
>197 Current_Pending_Sector  0x0032   192   192   000    Old_age
Always
>   -       1423
>198 Offline_Uncorrectable   0x0030   196   196   000    Old_age
Offline
>   -       700
>199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age
Always
>   -       0
>200 Multi_Zone_Error_Rate   0x0008   001   001   000    Old_age
Offline
>   -       793265
>
>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  Extended offline    Completed: read failure       90%     14545
> 1141581559
># 2  Short offline       Completed: read failure       90%     14545
> 1141577005
>
>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.
>
>
>
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