Re: [gentoo-user] [OT] Badblocks on my harddisk

[Volker Armin Hemmann <volkerarmin@googlemail.com>]

Am 26.07.2014 14:16, schrieb meino.cramer@gmx.de:
> Volker Armin Hemmann <volkerarmin@googlemail.com> [14-07-26 14:08]:
>> Am 26.07.2014 12:26, schrieb meino.cramer@gmx.de:
>>> Mick <michaelkintzios@gmail.com> [14-07-26 11:28]:
>>>> On Saturday 26 Jul 2014 02:49:15 meino.cramer@gmx.de wrote:
>>>>> Hi,
>>>>>
>>>>> After running smartctl for an extended offline test I got
>>>>> a badblock (information extracted from the report):
>>>>>
>>>>> 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%     14460         4288352511 197 Current_Pending_Sector  0x0032   200 
>>>>>  200   000    Old_age   Always       -       1
>>>>>
>>>>> I found a explanation to map the LBA to a partition here:
>>>>> http://smartmontools.sourceforge.net/badblockhowto.html
>>>>>
>>>>> My partition layout is:
>>>>> #> sudo fdisk -lu /dev/sda
>>>>>
>>>>> Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
>>>>> Units: sectors of 1 * 512 = 512 bytes
>>>>> Sector size (logical/physical): 512 bytes / 512 bytes
>>>>> I/O size (minimum/optimal): 512 bytes / 512 bytes
>>>>> Disklabel type: dos
>>>>> Disk identifier: 0x07ec16a2
>>>>>
>>>>> Device     Boot      Start        End    Blocks  Id System
>>>>> /dev/sda1  *          2048     104447     51200  83 Linux
>>>>> /dev/sda2           104448   12687359   6291456  82 Linux swap / Solaris
>>>>> /dev/sda3         12687360  222402559 104857600  83 Linux
>>>>> /dev/sda4        222402560 1953525167 865561304   5 Extended
>>>>> /dev/sda5        222404608  232890367   5242880  83 Linux
>>>>> /dev/sda6        232892416  442607615 104857600  83 Linux
>>>>> /dev/sda7        442609664  652324863 104857600  83 Linux
>>>>> /dev/sda8        652326912  862042111 104857600  83 Linux
>>>>> /dev/sda9        862044160 1071759359 104857600  83 Linux
>>>>> /dev/sda10      1071761408 1281476607 104857600  83 Linux
>>>>> /dev/sda11      1281478656 1491193855 104857600  83 Linux
>>>>> /dev/sda12      1491195904 1953525167 231164632  83 Linux
>>>>>                 4288352511  <<< The number reported by smartctl
>>>>>
>>>>>
>>>>> Following the linked document...
>>>>> It seems the bad LBA is not on the checked harddisk.
>>>>>
>>>>> Or (more obvious) I did something wrong...
>>>> You are probably comparing different units.  The Start and End of fdisk are 
>>>> reporting sectors, each sector being 512 bytes.  Therefore if the LBA is 
>>>> reported by smartctl in bytes, you have:
>>>>
>>>> 4,288,352,511 ÷ 512 = 8,375,688.5
>>>>
>>>> which would place it within your swap partition.
>>>>
>>>> I would do this:
>>>>
>>>>  swapoff /dev/sda2
>>>>
>>>>  dd if=/dev/zero of=/dev/sda2 bs=512 conv=notrunc
>>>>
>>>>  mkswap -L swap -c /dev/sda2
>>>>
>>>>  swapon /dev/sda2
>>>>
>>>> and hopefully the problem will be gone when you run the next smartctl test.
>>>>
>>>> -- 
>>>> Regards,
>>>> Mick
>>> Sorry for stuutering postings...overlocked this one:
>>> #>dd if=/dev/zero of=/dev/sda2 bs=512 conv=notrunc
>>> dd: error writing ‘/dev/sda2’: Input/output error
>>>
>>> Hrrrmpfff...
>>>
>>> Why does it nt remap those ones?
>>>
>>> Best regards,
>>> mcc
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>> smartctl -a /dev/sda
>>
>> without those information: crystal ball.
>>
>> that said: it is swap. You shouldn't have to do anything. Don't touch dd.
>>
>>
>>
>
> Hi Volker,
>
> what happens if swapped is used and the write access tapped on the
> bad area?

nothing. As soon as someone tries to write on that sector, the drive
will map it out.

That means 'pending'. Nobody tried to write on it yet, so the drive had
no reason to 'reallocate' it so far.

> Here is the output of smartctl:
>
>
> smartctl 6.1 2013-03-16 r3800 [x86_64-linux-3.14.13-RT] (local build)
> Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org
>
> === START OF INFORMATION SECTION ===
> Model Family:     Western Digital Caviar Green (AF)
> Device Model:     WDC WD10EARS-00Y5B1
> Serial Number:    WD-WMAV51276611
> LU WWN Device Id: 5 0014ee 001f5fb47
> Firmware Version: 80.00A80
> 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:   ATA8-ACS (minor revision not indicated)
> SATA Version is:  SATA 2.6, 3.0 Gb/s
> Local Time is:    Sat Jul 26 14:16:19 2014 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:  (0x84)	Offline data collection activity
> 					was suspended by an interrupting command from host.
> 					Auto Offline Data Collection: Enabled.
> Self-test execution status:      ( 121)	The previous self-test completed having
> 					the read element of the test failed.
> Total time to complete Offline 
> data collection: 		(19380) 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: 	 ( 223) minutes.
> Conveyance self-test routine
> recommended polling time: 	 (   5) minutes.
> SCT capabilities: 	       (0x3031)	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   129   113   021    Pre-fail  Always       -       6508
>   4 Start_Stop_Count        0x0032   097   097   000    Old_age   Always       -       3957
>   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   081   081   000    Old_age   Always       -       14476
>  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   097   097   000    Old_age   Always       -       3808
> 192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       324
> 193 Load_Cycle_Count        0x0032   196   196   000    Old_age   Always       -       14602
> 194 Temperature_Celsius     0x0022   115   101   000    Old_age   Always       -       32
> 196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
> 197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       1
> 198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       1
> 199 UDMA_CRC_Error_Count    0x0032   200   197   000    Old_age   Always       -       13300
> 200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       1

so you got one defective sector, the drive knows about it, it has 200
spares and will use one when the need arises.

>
> 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  Conveyance offline  Completed: read failure       90%     14472         4288352511
> # 2  Extended offline    Completed: read failure       90%     14460         4288352511
> # 3  Extended offline    Completed without error       00%     13954         -
> # 4  Short offline       Completed without error       00%     13935         -
> # 5  Extended offline    Completed without error       00%      7051         -
> # 6  Extended offline    Completed without error       00%      2205         -
> # 7  Short offline       Completed without error       00%       463         -
>
> 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.
>
>
> Best regards,
> mcc
>
>
>
>