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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