[NCLUG] badblocks and smartctl?
John Gilmore
j.arthur.gilmore at gmail.com
Mon May 26 06:54:56 MDT 2014
I've got a Hard drive that smartctl is reporting 1 offline
uncorrectable sector on. I get an email about it per day, and it says:
>The following warning/error was logged by the smartd daemon:
>
>Device: /dev/sda [SAT], 1 Currently unreadable (pending) sectors
So, I figure I'll write to that sector and force a remapping, right?
Well which sector? Here's the output from badblocks:
>%sudo badblocks -b 512 -c 256 -e 5 -sv /dev/sda
>Checking blocks 0 to 3907029167
>Checking for bad blocks (read-only test): done
>Pass completed, 0 bad blocks found. (0/0/0 errors)
So there are no bad blocks? Maybe it was corrected? So below find the
output from smartctl -a, which *still* shows an uncorrectable sector
(not that the raw_value of "Current_Pending_Sector" and
"Offline_Uncorrectable" is 1)
Also note that the error log says "UNC at LBA = 0x0fffffff =
268435455" which *is* in the range that badblocks scanned. I'd go
ahead with the assumption that it's accurate, and use dd to touch that
sector (I'm using zfs with a mirror, so I can just scrub and any
corruption will be corrected afterwards, I don't have to worry about
damaging my data)
However, I'm concerned about doing that because "0x0fffffff" is just
such a nice round number that I suspect it's inaccurate, or that
something else is going on. I suppose that there'd be no real harm in
touching that sector anyway. I could even use dd to read it first. but
the badblocks results make no sense to me, wouldn't badblocks have
found it first if it was really bad?
I'm getting kind of tired of these constant emails about this issue.
It's like the boy who cried wolf - I really don't want to be in the
habit of ignoring emails from smartd!
%sudo smartctl -a /dev/sda
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.2.0-4-amd64] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Model Family: Seagate Barracuda Green (Adv. Format)
Device Model: ST2000DL003-9VT166
Serial Number: 5YD4XZER
LU WWN Device Id: 5 000c50 03d353474
Firmware Version: CC32
User Capacity: 2,000,398,934,016 bytes [2.00 TB]
Sector Size: 512 bytes logical/physical
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: ATA-8-ACS revision 4
Local Time is: Mon May 26 06:42:07 2014 MDT
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: ( 612) 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 106 099 006 Pre-fail
Always - 116640
3 Spin_Up_Time 0x0003 093 092 000 Pre-fail
Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age
Always - 91
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail
Always - 0
7 Seek_Error_Rate 0x000f 080 060 030 Pre-fail
Always - 26561998355
9 Power_On_Hours 0x0032 076 076 000 Old_age
Always - 21478
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail
Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age
Always - 139
183 Runtime_Bad_Block 0x0032 001 001 000 Old_age
Always - 260
184 End-to-End_Error 0x0032 100 100 099 Old_age
Always - 0
187 Reported_Uncorrect 0x0032 099 099 000 Old_age
Always - 1
188 Command_Timeout 0x0032 100 091 000 Old_age
Always - 74
189 High_Fly_Writes 0x003a 100 100 000 Old_age
Always - 0
190 Airflow_Temperature_Cel 0x0022 069 051 045 Old_age
Always - 31 (Min/Max 31/36)
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 - 109
193 Load_Cycle_Count 0x0032 100 100 000 Old_age
Always - 139
194 Temperature_Celsius 0x0022 031 049 000 Old_age
Always - 31 (0 15 0 0)
195 Hardware_ECC_Recovered 0x001a 018 006 000 Old_age
Always - 116640
197 Current_Pending_Sector 0x0012 100 100 000 Old_age
Always - 1
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age
Offline - 1
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age
Always - 0
240 Head_Flying_Hours 0x0000 100 253 000 Old_age
Offline - 50281182155357
241 Total_LBAs_Written 0x0000 100 253 000 Old_age
Offline - 763897891
242 Total_LBAs_Read 0x0000 100 253 000 Old_age
Offline - 4164416946
SMART Error Log Version: 1
ATA Error Count: 36 (device log contains only the most recent five errors)
CR = Command Register [HEX]
FR = Features Register [HEX]
SC = Sector Count Register [HEX]
SN = Sector Number Register [HEX]
CL = Cylinder Low Register [HEX]
CH = Cylinder High Register [HEX]
DH = Device/Head Register [HEX]
DC = Device Command Register [HEX]
ER = Error register [HEX]
ST = Status register [HEX]
Powered_Up_Time is measured from power on, and printed as
DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,
SS=sec, and sss=millisec. It "wraps" after 49.710 days.
Error 36 occurred at disk power-on lifetime: 935 hours (38 days + 23 hours)
When the command that caused the error occurred, the device was
active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 03:34:18.087 READ DMA EXT
27 00 00 00 00 00 e0 00 03:34:18.086 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 03:34:18.078 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 03:34:18.046 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 03:34:18.046 READ NATIVE MAX ADDRESS EXT
Error 35 occurred at disk power-on lifetime: 935 hours (38 days + 23 hours)
When the command that caused the error occurred, the device was
active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 03:34:18.087 READ DMA EXT
27 00 00 00 00 00 e0 00 03:34:18.086 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 03:34:18.078 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 03:34:18.046 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 03:34:18.046 READ NATIVE MAX ADDRESS EXT
Error 34 occurred at disk power-on lifetime: 935 hours (38 days + 23 hours)
When the command that caused the error occurred, the device was
active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 03:34:17.623 READ DMA EXT
27 00 00 00 00 00 e0 00 03:34:17.622 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 03:34:17.614 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 03:34:17.582 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 03:34:17.582 READ NATIVE MAX ADDRESS EXT
Error 33 occurred at disk power-on lifetime: 935 hours (38 days + 23 hours)
When the command that caused the error occurred, the device was
active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 03:34:17.623 READ DMA EXT
27 00 00 00 00 00 e0 00 03:34:17.622 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 03:34:17.614 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 03:34:17.582 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 03:34:17.582 READ NATIVE MAX ADDRESS EXT
Error 32 occurred at disk power-on lifetime: 935 hours (38 days + 23 hours)
When the command that caused the error occurred, the device was
active or idle.
After command completion occurred, registers were:
ER ST SC SN CL CH DH
-- -- -- -- -- -- --
40 51 00 ff ff ff 0f Error: UNC at LBA = 0x0fffffff = 268435455
Commands leading to the command that caused the error were:
CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name
-- -- -- -- -- -- -- -- ---------------- --------------------
25 00 08 ff ff ff ef 00 03:34:17.155 READ DMA EXT
27 00 00 00 00 00 e0 00 03:34:17.154 READ NATIVE MAX ADDRESS EXT
ec 00 00 00 00 00 a0 00 03:34:17.146 IDENTIFY DEVICE
ef 03 46 00 00 00 a0 00 03:34:17.114 SET FEATURES [Set transfer mode]
27 00 00 00 00 00 e0 00 03:34:17.114 READ NATIVE MAX ADDRESS EXT
SMART Self-test log structure revision number 1
Num Test_Description Status Remaining
LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed without error 00% 21475 -
# 2 Short offline Completed without error 00% 21451 -
# 3 Extended offline Completed without error 00% 21432 -
# 4 Short offline Completed without error 00% 21403 -
# 5 Extended offline Interrupted (host reset) 90% 21393 -
# 6 Short offline Completed without error 00% 21386 -
# 7 Short offline Completed without error 00% 21362 -
# 8 Extended offline Completed without error 00% 21343 -
# 9 Short offline Completed without error 00% 21314 -
#10 Extended offline Completed without error 00% 21313 -
#11 Short offline Completed without error 00% 21124 -
#12 Short offline Completed without error 00% 21100 -
#13 Short offline Completed without error 00% 21076 -
#14 Extended offline Completed without error 00% 21057 -
#15 Short offline Completed without error 00% 21028 -
#16 Short offline Completed without error 00% 21004 -
#17 Short offline Completed without error 00% 20980 -
#18 Short offline Completed without error 00% 20956 -
#19 Short offline Completed without error 00% 20936 -
#20 Short offline Interrupted (host reset) 00% 20925 -
#21 Short offline Completed without error 00% 20909 -
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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