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@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Bob Hepple Sent: 27 January 2014 08:11 To: centos@centos.org Subject: [CentOS] 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
03 Spin_Up_Time 0x0027 114 107 021 Pre-fail
Always
72834 Start_Stop_Count 0x0032 091 091 000 Old_age
Always
97645 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail
Always
07 Seek_Error_Rate 0x002e 200 200 000 Old_age
Always
09 Power_On_Hours 0x0032 080 080 000 Old_age
Always
1490710 Spin_Retry_Count 0x0032 100 100 000 Old_age
Always
011 Calibration_Retry_Count 0x0032 100 100 000 Old_age
Always
012 Power_Cycle_Count 0x0032 100 100 000 Old_age
Always
181192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age
Always
82193 Load_Cycle_Count 0x0032 186 186 000 Old_age
Always
44531194 Temperature_Celsius 0x0022 098 083 000 Old_age
Always
49196 Reallocated_Event_Count 0x0032 200 200 000 Old_age
Always
0197 Current_Pending_Sector 0x0032 192 192 000 Old_age
Always
1423198 Offline_Uncorrectable 0x0030 196 196 000 Old_age
Offline
700199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age
Always
0200 Multi_Zone_Error_Rate 0x0008 001 001 000 Old_age
Offline
793265SMART 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.
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
This email and any attachments to it may be confidential and are intended solely for the use of the individual to whom it is addressed. If you are not the intended recipient of this email, you must neither take any action based upon its contents, nor copy or show it to anyone. Please contact the sender if you believe you have received this email in error. QinetiQ may monitor email traffic data and also the content of email for the purposes of security. QinetiQ Limited (Registered in England & Wales: Company Number: 3796233) Registered office: Cody Technology Park, Ively Road, Farnborough, Hampshire, GU14 0LX http://www.qinetiq.com.