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Olis
Apprentice
Joined: 29 Sep 2004
Posts: 177
Location: Germany
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 Posted: Sat Apr 09, 2011 5:10 pm Post subject: Is my disk dying? |
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Hi everybody,
two days ago smartd sent me an email:
| Code: | The following warning/error was logged by the smartd daemon:
Device: /dev/sda [SAT], 1 Currently unreadable (pending) sectors |
So I ran a long selftest on /dev/sda. I'm doing the long selftest weekly and never saw any problems. Same today...
| Code: | ~ # smartctl -a /dev/sda
smartctl 5.40 2010-10-16 r3189 [i686-pc-linux-gnu] (local build)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Model Family: SAMSUNG SpinPoint T166 series
Device Model: SAMSUNG HD501LJ
Serial Number: S10NJ1KP714345
Firmware Version: CR100-10
User Capacity: 500,107,862,016 bytes
Device is: In smartctl database [for details use: -P show]
ATA Version is: 8
ATA Standard is: ATA-8-ACS revision 3b
Local Time is: Sat Apr 9 16:27:15 2011 CEST
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: (9114) seconds.
Offline data collection
capabilities: (0x5b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
No 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: ( 155) minutes.
SCT capabilities: (0x003f) SCT Status supported.
SCT Error Recovery Control 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 0x000f 100 100 051 Pre-fail Always - 9
3 Spin_Up_Time 0x0007 100 100 015 Pre-fail Always - 7552
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 128
5 Reallocated_Sector_Ct 0x0033 253 253 010 Pre-fail Always - 0
7 Seek_Error_Rate 0x000f 253 253 051 Pre-fail Always - 0
8 Seek_Time_Performance 0x0025 253 253 015 Pre-fail Offline - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 30708
10 Spin_Retry_Count 0x0033 253 253 051 Pre-fail Always - 0
11 Calibration_Retry_Count 0x0012 253 100 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 103
187 Reported_Uncorrect 0x0032 253 253 000 Old_age Always - 655360
188 Command_Timeout 0x0032 253 253 000 Old_age Always - 0
190 Airflow_Temperature_Cel 0x0022 064 055 000 Old_age Always - 36
194 Temperature_Celsius 0x0022 130 103 000 Old_age Always - 36
195 Hardware_ECC_Recovered 0x001a 100 100 000 Old_age Always - 840177878
196 Reallocated_Event_Count 0x0032 253 253 000 Old_age Always - 0
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 1
198 Offline_Uncorrectable 0x0030 253 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x000a 100 100 000 Old_age Always - 0
201 Soft_Read_Error_Rate 0x000a 100 100 000 Old_age Always - 0
202 Data_Address_Mark_Errs 0x0032 253 253 000 Old_age Always - 0
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 without error 00% 30700 -
# 2 Short offline Completed without error 00% 30675 -
# 3 Extended offline Completed without error 00% 30539 -
# 4 Extended offline Completed without error 00% 30367 -
# 5 Extended offline Completed without error 00% 30198 -
# 6 Extended offline Completed without error 00% 30029 -
# 7 Extended offline Completed without error 00% 29863 -
# 8 Extended offline Completed without error 00% 29701 -
# 9 Extended offline Completed without error 00% 29525 -
#10 Extended offline Completed without error 00% 29357 -
#11 Extended offline Completed without error 00% 29189 -
#12 Extended offline Completed without error 00% 29021 -
#13 Extended offline Completed without error 00% 28853 -
#14 Extended offline Completed without error 00% 28685 -
#15 Extended offline Completed without error 00% 28516 -
#16 Extended offline Completed without error 00% 28349 -
#17 Extended offline Completed without error 00% 28182 -
#18 Extended offline Completed without error 00% 28031 -
#19 Extended offline Completed without error 00% 27844 -
#20 Extended offline Completed without error 00% 27677 -
#21 Extended offline Completed without error 00% 27509 -
Note: selective self-test log revision number (0) not 1 implies that no selective self-test has ever been run
SMART Selective self-test log data structure revision number 0
Note: revision number not 1 implies that no selective self-test has ever been run
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. |
I also ran "badblocks -s -c 256 /dev/sda" but again it found no problems.
Nevertheless the smartmon daemon is logging 1 unreadable sector every half an hour.
| Code: | Apr 9 17:22:35 frodo smartd[8608]: Device: /dev/sda [SAT], 1 Currently unreadable (pending) sectors
Apr 9 17:52:35 frodo smartd[8608]: Device: /dev/sda [SAT], 1 Currently unreadable (pending) sectors
Apr 9 18:22:35 frodo smartd[8608]: Device: /dev/sda [SAT], 1 Currently unreadable (pending) sectors
Apr 9 18:52:35 frodo smartd[8608]: Device: /dev/sda [SAT], 1 Currently unreadable (pending) sectors |
I think I will replace the drive since the data on it is much more expensive than a new drive. Nevertheless I'm asking myself if there's really a problem with my drive.
Oliver |
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Hypnos
Advocate
Joined: 18 Jul 2002
Posts: 2889
Location: Omnipresent
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| Posted: Sat Apr 09, 2011 10:03 pm Post subject: Re: Is my disk dying? |
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| Olis wrote: | | I think I will replace the drive since the data on it is much more expensive than a new drive. |
So this means you have a full backup on another disk, right?
As for your question, I don't know either, since all your tools report everything OK. It may be that your hard disk controller is running a check that your generic Linux software does not/cannot, and you should use the manufacturer's specialized software tools to investigate further. In any event, I agree that it's wise to replace the disk.
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Personal overlay | Simple backup scheme |
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Olis
Apprentice
Joined: 29 Sep 2004
Posts: 177
Location: Germany
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| Posted: Sat Apr 09, 2011 11:12 pm Post subject: Re: Is my disk dying? |
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| Hypnos wrote: | | Olis wrote: | | I think I will replace the drive since the data on it is much more expensive than a new drive. |
So this means you have a full backup on another disk, right?
As for your question, I don't know either, since all your tools report everything OK. It may be that your hard disk controller is running a check that your generic Linux software does not/cannot, and you should use the manufacturer's specialized software tools to investigate further. In any event, I agree that it's wise to replace the disk. |
Yes, I have a full backup on another disk and I have the same model as a replacement.
I was just wondering why smartmontools report an unreadable error, while the same tool doesn't find a defective block during the long selftest.
badblocks reads the whole disk sector by sector. And it also didn't find a problem. So I mirrored the (probably) defective disk using dd to my spare disk and then replaced it. The replacement disk is now running fine and smartd doesn't report any errors. |
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Hypnos
Advocate
Joined: 18 Jul 2002
Posts: 2889
Location: Omnipresent
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| Posted: Sun Apr 10, 2011 4:17 am Post subject: |
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If you're curious, try the tools directly from the hard disk manufacturer, see if that can catch anything.
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Mad Merlin
Veteran
Joined: 09 May 2005
Posts: 1155
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| Posted: Wed Apr 13, 2011 3:31 pm Post subject: |
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Disks reserve a small number of sectors for remapping bad sectors. Next time you write to that sector, it will be transparently remapped to a different sector and no errors will be reported back to the host OS. Eventually, you'll run out of extra sectors, and you'll want to replace the disk before that time, but a single bad sector is generally nothing to worry about. When the number starts rising steadily, it's time to chuck the drive. Don't count on having more than a few dozen reserved sectors though.
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