Re: Do I have a bad HDD?

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On 31 July 2011 19:05, Mathias Burén <mathias.buren@xxxxxxxxx> wrote:
> On 31 July 2011 18:59, Mathias Burén <mathias.buren@xxxxxxxxx> wrote:
>> On 31 July 2011 14:05, Mathias Burén <mathias.buren@xxxxxxxxx> wrote:
>>> Hi list,
>>>
>>> Here's the output of my weekly script:
>>>
>>> DEV     EVENTS  REALL   PEND    UNCORR  CRC     RAW     ZONE    END
>>> sdb1    6158767 0       0       0       2       0       0
>>> sdc1    6158767 0       0       0       0       0       0
>>> sdd1    6158767 0       0       0       0       0       0
>>> sde1    6158767 0       0       0       0       0       1
>>> sdf1    6158767 0       0       0       0       47      6
>>> sdg1    6158767 0       0       0       0       0       0
>>> sdh1    6158767 0       6       0       0       340     3
>>>
>>>
>>> Personalities : [raid6] [raid5] [raid4]
>>> md0 : active raid6 sdf1[5] sdh1[6] sdg1[0] sde1[7] sdc1[3] sdd1[4] sdb1[1]
>>>      9751756800 blocks super 1.2 level 6, 64k chunk, algorithm 2
>>> [7/7] [UUUUUUU]
>>>
>>> unused devices: <none>
>>>
>>>
>>> /dev/md0:
>>>        Version : 1.2
>>>  Creation Time : Tue Oct 19 08:58:41 2010
>>>     Raid Level : raid6
>>>     Array Size : 9751756800 (9300.00 GiB 9985.80 GB)
>>>  Used Dev Size : 1950351360 (1860.00 GiB 1997.16 GB)
>>>   Raid Devices : 7
>>>  Total Devices : 7
>>>    Persistence : Superblock is persistent
>>>
>>>    Update Time : Sun Jul 31 09:50:43 2011
>>>          State : clean
>>>  Active Devices : 7
>>> Working Devices : 7
>>>  Failed Devices : 0
>>>  Spare Devices : 0
>>>
>>>         Layout : left-symmetric
>>>     Chunk Size : 64K
>>>
>>>           Name : ion:0  (local to host ion)
>>>           UUID : e6595c64:b3ae90b3:f01133ac:3f402d20
>>>         Events : 6158767
>>>
>>>    Number   Major   Minor   RaidDevice State
>>>       0       8       97        0      active sync   /dev/sdg1
>>>       1       8       17        1      active sync   /dev/sdb1
>>>       4       8       49        2      active sync   /dev/sdd1
>>>       3       8       33        3      active sync   /dev/sdc1
>>>       5       8       81        4      active sync   /dev/sdf1
>>>       6       8      113        5      active sync   /dev/sdh1
>>>       7       8       65        6      active sync   /dev/sde1
>>>
>>> Here's the SMART data for sdh:
>>>
>>>
>>> smartctl 5.41 2011-06-09 r3365 [x86_64-linux-2.6.39-ck] (local build)
>>> Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
>>>
>>> === START OF INFORMATION SECTION ===
>>> Model Family:     SAMSUNG SpinPoint F4 EG (AFT)
>>> Device Model:     SAMSUNG HD204UI
>>> Serial Number:    S2HGJ1RZ800850
>>> LU WWN Device Id: 5 0024e9 003f1ebc9
>>> Firmware Version: 1AQ10003
>>> 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 6
>>> Local Time is:    Sun Jul 31 14:03:32 2011 IST
>>>
>>> ==> WARNING: Using smartmontools or hdparm with this
>>> drive may result in data loss due to a firmware bug.
>>> ****** THIS DRIVE MAY OR MAY NOT BE AFFECTED! ******
>>> Buggy and fixed firmware report same version number!
>>> See the following web pages for details:
>>> http://www.samsung.com/global/business/hdd/faqView.do?b2b_bbs_msg_id=386
>>> http://sourceforge.net/apps/trac/smartmontools/wiki/SamsungF4EGBadBlocks
>>>
>>> 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:      (  37) The self-test routine was interrupted
>>>                                        by the host with a hard or soft reset.
>>> Total time to complete Offline
>>> data collection:                (20640) 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:        ( 255) 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     0x002f   100   100   051    Pre-fail
>>> Always       -       340
>>>  2 Throughput_Performance  0x0026   055   053   000    Old_age
>>> Always       -       18989
>>>  3 Spin_Up_Time            0x0023   067   044   025    Pre-fail
>>> Always       -       10165
>>>  4 Start_Stop_Count        0x0032   100   100   000    Old_age
>>> Always       -       18
>>>  5 Reallocated_Sector_Ct   0x0033   252   252   010    Pre-fail
>>> Always       -       0
>>>  7 Seek_Error_Rate         0x002e   252   252   051    Old_age
>>> Always       -       0
>>>  8 Seek_Time_Performance   0x0024   252   252   015    Old_age
>>> Offline      -       0
>>>  9 Power_On_Hours          0x0032   100   100   000    Old_age
>>> Always       -       6447
>>>  10 Spin_Retry_Count        0x0032   252   252   051    Old_age
>>> Always       -       0
>>>  11 Calibration_Retry_Count 0x0032   252   252   000    Old_age
>>> Always       -       0
>>>  12 Power_Cycle_Count       0x0032   100   100   000    Old_age
>>> Always       -       20
>>> 181 Program_Fail_Cnt_Total  0x0022   100   100   000    Old_age
>>> Always       -       10117271
>>> 191 G-Sense_Error_Rate      0x0022   100   100   000    Old_age
>>> Always       -       1
>>> 192 Power-Off_Retract_Count 0x0022   252   252   000    Old_age
>>> Always       -       0
>>> 194 Temperature_Celsius     0x0002   064   057   000    Old_age
>>> Always       -       35 (Min/Max 16/43)
>>> 195 Hardware_ECC_Recovered  0x003a   100   100   000    Old_age
>>> Always       -       0
>>> 196 Reallocated_Event_Count 0x0032   252   252   000    Old_age
>>> Always       -       0
>>> 197 Current_Pending_Sector  0x0032   100   100   000    Old_age
>>> Always       -       6
>>> 198 Offline_Uncorrectable   0x0030   252   252   000    Old_age
>>> Offline      -       0
>>> 199 UDMA_CRC_Error_Count    0x0036   200   200   000    Old_age
>>> Always       -       0
>>> 200 Multi_Zone_Error_Rate   0x002a   100   100   000    Old_age
>>> Always       -       3
>>> 223 Load_Retry_Count        0x0032   252   252   000    Old_age
>>> Always       -       0
>>> 225 Load_Cycle_Count        0x0032   100   100   000    Old_age
>>> Always       -       21
>>>
>>> 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    Interrupted (host reset)      50%      6408         -
>>> # 2  Extended offline    Completed without error       00%      6317         -
>>> # 3  Extended offline    Completed without error       00%      6260         -
>>> # 4  Extended offline    Completed without error       00%      6232         -
>>> # 5  Extended offline    Completed without error       00%      6170         -
>>> # 6  Extended offline    Completed without error       00%      6064         -
>>> # 7  Extended offline    Completed without error       00%      6029         -
>>> # 8  Extended offline    Completed without error       00%      5898         -
>>> # 9  Extended offline    Aborted by host               60%      5893         -
>>> #10  Extended offline    Completed without error       00%      5728         -
>>> #11  Extended offline    Completed without error       00%      5706         -
>>> #12  Extended offline    Interrupted (host reset)      40%      5701         -
>>> #13  Extended offline    Interrupted (host reset)      90%      5666         -
>>> #14  Extended offline    Completed without error       00%      5560         -
>>> #15  Extended offline    Completed without error       00%      5527         -
>>> #16  Extended offline    Completed without error       00%      5392         -
>>> #17  Extended offline    Completed without error       00%      5357         -
>>> #18  Extended offline    Completed without error       00%      5250         -
>>> #19  Extended offline    Completed without error       00%      4272         -
>>> #20  Extended offline    Completed without error       00%      4017         -
>>> #21  Extended offline    Completed without error       00%      3935         -
>>>
>>> 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  Interrupted [50% left] (0-65535)
>>>    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.
>>>
>>>
>>> It has 6 pending sectors. Why are they not reallocated? Can I force
>>> this somehow? (a scrub did not reallocate them) Is this enough to
>>> replace the HDD?
>>>
>>> Thanks,
>>> Mathias
>>>
>>
>> Uh oh, I did another scrub, and here's the status:
>>
>> DEV     EVENTS  REALL   PEND    UNCORR  CRC     RAW     ZONE    END
>> sdb1    6158767 0       0       0       2       0       0
>> sdc1    6158767 0       0       0       0       0       0
>> sdd1    6158767 0       0       0       0       0       0
>> sde1    6158767 0       0       0       0       0       1
>> sdf1    6158768 0       0       0       0       47      6
>> sdg1    6158767 0       0       0       0       0       0
>> sdh1    6158767 0       8       1       0       341     3
>>
>>
>> Personalities : [raid6] [raid5] [raid4]
>> md0 : active raid6 sdh1[6] sdg1[0] sdf1[5] sde1[7] sdd1[4] sdb1[1] sdc1[3]
>>      9751756800 blocks super 1.2 level 6, 64k chunk, algorithm 2
>> [7/7] [UUUUUUU]
>>
>> unused devices: <none>
>>
>>
>> /dev/md0:
>>        Version : 1.2
>>  Creation Time : Tue Oct 19 08:58:41 2010
>>     Raid Level : raid6
>>     Array Size : 9751756800 (9300.00 GiB 9985.80 GB)
>>  Used Dev Size : 1950351360 (1860.00 GiB 1997.16 GB)
>>   Raid Devices : 7
>>  Total Devices : 7
>>    Persistence : Superblock is persistent
>>
>>    Update Time : Sun Jul 31 18:51:58 2011
>>          State : clean
>>  Active Devices : 7
>> Working Devices : 7
>>  Failed Devices : 0
>>  Spare Devices : 0
>>
>>         Layout : left-symmetric
>>     Chunk Size : 64K
>>
>>           Name : ion:0  (local to host ion)
>>           UUID : e6595c64:b3ae90b3:f01133ac:3f402d20
>>         Events : 6158767
>>
>>    Number   Major   Minor   RaidDevice State
>>       0       8       97        0      active sync   /dev/sdg1
>>       1       8       17        1      active sync   /dev/sdb1
>>       4       8       49        2      active sync   /dev/sdd1
>>       3       8       33        3      active sync   /dev/sdc1
>>       5       8       81        4      active sync   /dev/sdf1
>>       6       8      113        5      active sync   /dev/sdh1
>>       7       8       65        6      active sync   /dev/sde1
>>
>> smartctl 5.41 2011-06-09 r3365 [x86_64-linux-2.6.39-ck] (local build)
>> Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
>>
>> === START OF INFORMATION SECTION ===
>> Model Family:     SAMSUNG SpinPoint F4 EG (AFT)
>> Device Model:     SAMSUNG HD204UI
>> Serial Number:    S2HGJ1RZ800850
>> LU WWN Device Id: 5 0024e9 003f1ebc9
>> Firmware Version: 1AQ10003
>> 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 6
>> Local Time is:    Sun Jul 31 18:51:59 2011 IST
>>
>> ==> WARNING: Using smartmontools or hdparm with this
>> drive may result in data loss due to a firmware bug.
>> ****** THIS DRIVE MAY OR MAY NOT BE AFFECTED! ******
>> Buggy and fixed firmware report same version number!
>> See the following web pages for details:
>> http://www.samsung.com/global/business/hdd/faqView.do?b2b_bbs_msg_id=386
>> http://sourceforge.net/apps/trac/smartmontools/wiki/SamsungF4EGBadBlocks
>>
>> 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:  (0x80) Offline data collection activity
>>                                        was never started.
>>                                        Auto Offline Data Collection: Enabled.
>> Self-test execution status:      ( 118) The previous self-test completed having
>>                                        the read element of the test failed.
>> Total time to complete Offline
>> data collection:                (20640) 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:        ( 255) 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     0x002f   100   100   051    Pre-fail
>> Always       -       341
>>  2 Throughput_Performance  0x0026   055   053   000    Old_age
>> Always       -       18989
>>  3 Spin_Up_Time            0x0023   067   044   025    Pre-fail
>> Always       -       10165
>>  4 Start_Stop_Count        0x0032   100   100   000    Old_age
>> Always       -       18
>>  5 Reallocated_Sector_Ct   0x0033   252   252   010    Pre-fail
>> Always       -       0
>>  7 Seek_Error_Rate         0x002e   252   252   051    Old_age
>> Always       -       0
>>  8 Seek_Time_Performance   0x0024   252   252   015    Old_age
>> Offline      -       0
>>  9 Power_On_Hours          0x0032   100   100   000    Old_age
>> Always       -       6452
>>  10 Spin_Retry_Count        0x0032   252   252   051    Old_age
>> Always       -       0
>>  11 Calibration_Retry_Count 0x0032   252   252   000    Old_age
>> Always       -       0
>>  12 Power_Cycle_Count       0x0032   100   100   000    Old_age
>> Always       -       20
>> 181 Program_Fail_Cnt_Total  0x0022   100   100   000    Old_age
>> Always       -       10121757
>> 191 G-Sense_Error_Rate      0x0022   100   100   000    Old_age
>> Always       -       1
>> 192 Power-Off_Retract_Count 0x0022   252   252   000    Old_age
>> Always       -       0
>> 194 Temperature_Celsius     0x0002   064   057   000    Old_age
>> Always       -       31 (Min/Max 16/43)
>> 195 Hardware_ECC_Recovered  0x003a   100   100   000    Old_age
>> Always       -       0
>> 196 Reallocated_Event_Count 0x0032   252   252   000    Old_age
>> Always       -       0
>> 197 Current_Pending_Sector  0x0032   100   100   000    Old_age
>> Always       -       8
>> 198 Offline_Uncorrectable   0x0030   100   100   000    Old_age
>> Offline      -       1
>> 199 UDMA_CRC_Error_Count    0x0036   200   200   000    Old_age
>> Always       -       0
>> 200 Multi_Zone_Error_Rate   0x002a   100   100   000    Old_age
>> Always       -       3
>> 223 Load_Retry_Count        0x0032   252   252   000    Old_age
>> Always       -       0
>> 225 Load_Cycle_Count        0x0032   100   100   000    Old_age
>> Always       -       21
>>
>> 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       60%      6452
>>      1519520304
>> # 2  Extended offline    Interrupted (host reset)      50%      6408         -
>> # 3  Extended offline    Completed without error       00%      6317         -
>> # 4  Extended offline    Completed without error       00%      6260         -
>> # 5  Extended offline    Completed without error       00%      6232         -
>> # 6  Extended offline    Completed without error       00%      6170         -
>> # 7  Extended offline    Completed without error       00%      6064         -
>> # 8  Extended offline    Completed without error       00%      6029         -
>> # 9  Extended offline    Completed without error       00%      5898         -
>> #10  Extended offline    Aborted by host               60%      5893         -
>> #11  Extended offline    Completed without error       00%      5728         -
>> #12  Extended offline    Completed without error       00%      5706         -
>> #13  Extended offline    Interrupted (host reset)      40%      5701         -
>> #14  Extended offline    Interrupted (host reset)      90%      5666         -
>> #15  Extended offline    Completed without error       00%      5560         -
>> #16  Extended offline    Completed without error       00%      5527         -
>> #17  Extended offline    Completed without error       00%      5392         -
>> #18  Extended offline    Completed without error       00%      5357         -
>> #19  Extended offline    Completed without error       00%      5250         -
>> #20  Extended offline    Completed without error       00%      4272         -
>> #21  Extended offline    Completed without error       00%      4017         -
>>
>> 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  Completed_read_failure [60% left] (0-65535)
>>    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 do have a bad HDD. RMA is already in progress, I need to take out
>> the drive and ship it to Samsung in Holland. Will print labels at work
>> on Tuesday.
>>
>> Questions:
>>
>> * How do I remove this HDD without causing damage to the array? Is
>> this the correct way?:
>> mdadm --manage /dev/md0 --fail /dev/sdh1 # fail the device
>> mdadm --manage /dev/md0 --remove /dev/sdh1 # remove the device
>> * (shut down the system gracefully)
>> * (remove the HDD)
>> * (install new HDD)
>> * (start system)
>> sfdisk -d /dev/sde | sfdisk /dev/sdh # partition the new HDD
>> mdadm --manage /dev/md0 --add /dev/sdh1 # add the partition to the array
>>
>> * After removing the HDD, should I do another scrub?
>>
>> Thanks a lot in advance!
>>
>> /Mathias
>>
>
> I think I need to hurry up:
>
> [13957.348692] ata10.00: exception Emask 0x0 SAct 0x3 SErr 0x0 action 0x6 frozen
> [13957.348704] ata10.00: failed command: READ FPDMA QUEUED
> [13957.348716] ata10.00: cmd 60/08:00:00:ab:5a/00:00:e1:00:00/40 tag 0
> ncq 4096 in
> [13957.348719]          res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask
> 0x4 (timeout)
> [13957.348724] ata10.00: status: { DRDY }
> [13957.348730] ata10.00: failed command: WRITE FPDMA QUEUED
> [13957.348741] ata10.00: cmd 61/08:08:a8:e7:8d/00:00:2e:00:00/40 tag 1
> ncq 4096 out
> [13957.348743]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
> 0x4 (timeout)
> [13957.348749] ata10.00: status: { DRDY }
> [13957.348759] ata10: hard resetting link
> [13962.835319] ata10: link is slow to respond, please be patient (ready=0)
> [13967.368679] ata10: SRST failed (errno=-16)
> [13967.368693] ata10: hard resetting link
> [13970.988699] ata10: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> [13971.002394] ata10.00: configured for UDMA/133
> [13971.002407] ata10.00: device reported invalid CHS sector 0
> [13971.002413] ata10.00: device reported invalid CHS sector 0
> [13971.002427] ata10: EH complete
> [14001.358848] ata10.00: exception Emask 0x0 SAct 0x2 SErr 0x0 action 0x6 frozen
> [14001.358862] ata10.00: failed command: READ FPDMA QUEUED
> [14001.358887] ata10.00: cmd 60/08:08:00:ab:5a/00:00:e1:00:00/40 tag 1
> ncq 4096 in
> [14001.358890]          res 40/00:00:00:00:00/00:00:00:00:00/00 Emask
> 0x4 (timeout)
> [14001.358898] ata10.00: status: { DRDY }
> [14001.358913] ata10: hard resetting link
> [14006.845324] ata10: link is slow to respond, please be patient (ready=0)
> [14011.378656] ata10: SRST failed (errno=-16)
> [14011.378669] ata10: hard resetting link
> [14016.865323] ata10: link is slow to respond, please be patient (ready=0)
> [14021.398640] ata10: SRST failed (errno=-16)
> [14021.398652] ata10: hard resetting link
> [14026.885310] ata10: link is slow to respond, please be patient (ready=0)
> [14029.925349] ata10: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> [14029.939048] ata10.00: configured for UDMA/133
> [14029.939061] ata10.00: device reported invalid CHS sector 0
> [14029.939078] ata10: EH complete
> [14060.345358] ata10.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
> [14060.345371] ata10.00: failed command: READ FPDMA QUEUED
> [14060.345384] ata10.00: cmd 60/08:00:00:ab:5a/00:00:e1:00:00/40 tag 0
> ncq 4096 in
> [14060.345387]          res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask
> 0x4 (timeout)
> [14060.345394] ata10.00: status: { DRDY }
> [14060.345407] ata10: hard resetting link
> [14065.831985] ata10: link is slow to respond, please be patient (ready=0)
> [14070.365333] ata10: SRST failed (errno=-16)
> [14070.365345] ata10: hard resetting link
> [14074.625347] ata10: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> [14074.639043] ata10.00: configured for UDMA/133
> [14074.639056] ata10.00: device reported invalid CHS sector 0
> [14074.639088] ata10: EH complete
> [14105.358687] ata10.00: NCQ disabled due to excessive errors
> [14105.358700] ata10.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x6 frozen
> [14105.358712] ata10.00: failed command: READ FPDMA QUEUED
> [14105.358729] ata10.00: cmd 60/08:00:00:ab:5a/00:00:e1:00:00/40 tag 0
> ncq 4096 in
> [14105.358732]          res 40/00:00:00:4f:c2/00:00:00:00:00/00 Emask
> 0x4 (timeout)
> [14105.358741] ata10.00: status: { DRDY }
> [14105.358754] ata10: hard resetting link
> [14110.845314] ata10: link is slow to respond, please be patient (ready=0)
> [14115.378674] ata10: SRST failed (errno=-16)
> [14115.378689] ata10: hard resetting link
> [14119.372023] ata10: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
> [14119.385704] ata10.00: configured for UDMA/133
> [14119.385716] ata10.00: device reported invalid CHS sector 0
> [14119.385743] ata10: EH complete
> [14121.527814] ata10.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
> [14121.527824] ata10.00: edma_err_cause=00000084 pp_flags=00000001,
> dev error, EDMA self-disable
> [14121.527832] ata10.00: failed command: READ DMA EXT
> [14121.527844] ata10.00: cmd 25/00:08:00:ab:5a/00:00:e1:00:00/e0 tag 0
> dma 4096 in
> [14121.527846]          res 51/89:08:00:ab:5a/89:00:e1:00:00/e0 Emask
> 0x10 (ATA bus error)
> [14121.527852] ata10.00: status: { DRDY ERR }
> [14121.527857] ata10.00: error: { ICRC }
> [14121.527867] ata10: hard resetting link
> [14127.011973] ata10: link is slow to respond, please be patient (ready=0)
> [14131.545295] ata10: SRST failed (errno=-16)
> [14131.545307] ata10: hard resetting link
> [14137.031984] ata10: link is slow to respond, please be patient (ready=0)
> [14141.565306] ata10: SRST failed (errno=-16)
> [14141.565317] ata10: hard resetting link
> [14147.051993] ata10: link is slow to respond, please be patient (ready=0)
> [14161.032035] INFO: task jbd2/dm-0-8:613 blocked for more than 120 seconds.
> [14161.032044] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [14161.032050] jbd2/dm-0-8     D ffffffff81823020     0   613      2 0x00000000
> [14161.032060]  ffff8800c91e11a0 0000000000000046 0000000000000000
> ffff8800cf0697c0
> [14161.032070]  ffff8800cf069780 ffff8800cf069780 ffff8800c93bdfd8
> ffff8800c93bdfd8
> [14161.032079]  ffff8800c91e13d8 0000000000004000 ffff880094ed19c0
> ffff8800c97e0688
> [14161.032087] Call Trace:
> [14161.032106]  [<ffffffff81204c67>] ? generic_make_request+0x2f7/0x570
> [14161.032116]  [<ffffffff81133200>] ? __wait_on_buffer+0x30/0x30
> [14161.032124]  [<ffffffff814262e7>] ? io_schedule+0x57/0x80
> [14161.032131]  [<ffffffff8113320a>] ? sleep_on_buffer+0xa/0x20
> [14161.032137]  [<ffffffff81426a2f>] ? __wait_on_bit+0x4f/0x80
> [14161.032143]  [<ffffffff81133200>] ? __wait_on_buffer+0x30/0x30
> [14161.032150]  [<ffffffff81426add>] ? out_of_line_wait_on_bit+0x7d/0xa0
> [14161.032159]  [<ffffffff81059300>] ? autoremove_wake_function+0x30/0x30
> [14161.032168]  [<ffffffff811b680e>] ?
> jbd2_journal_commit_transaction+0x155e/0x16f0
> [14161.032176]  [<ffffffff810592d0>] ? abort_exclusive_wait+0xb0/0xb0
> [14161.032183]  [<ffffffff8142968e>] ? apic_timer_interrupt+0xe/0x20
> [14161.032191]  [<ffffffff811baddd>] ? kjournald2+0xad/0x210
> [14161.032198]  [<ffffffff810592d0>] ? abort_exclusive_wait+0xb0/0xb0
> [14161.032205]  [<ffffffff811bad30>] ? commit_timeout+0x10/0x10
> [14161.032212]  [<ffffffff81058a0f>] ? kthread+0x7f/0x90
> [14161.032219]  [<ffffffff81429a54>] ? kernel_thread_helper+0x4/0x10
> [14161.032226]  [<ffffffff81058990>] ? kthread_worker_fn+0x180/0x180
> [14161.032233]  [<ffffffff81429a50>] ? gs_change+0xb/0xb
> [14161.032261] INFO: task squid:1659 blocked for more than 120 seconds.
> [14161.032264] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
> disables this message.
> [14161.032269] squid           D ffffffff81823020     0  1659   1657 0x00000000
> [14161.032277]  ffff8800c9179d60 0000000000000082 ffff8800c97b0688
> ffffffff812bf074
> [14161.032285]  ffff880012b818c0 ffffffff81823020 ffff8800c22c5fd8
> ffff8800c22c5fd8
> [14161.032293]  ffff8800c9179f98 0000000000004000 ffff8800c22c5fd8
> 0000000000000000
> [14161.032301] Call Trace:
>
>
> :-/
>
> Currently shutting down all daemons that access the filesystem on the
> array, in attempt to umount the fs.
>

Sorry for spamming like this, it's happening in realtime. While I was
shutting down daemons it looks like MD took out the failing HDD
itself, see:

[14401.032600] INFO: task flush-253:0:25632 blocked for more than 120 seconds.
[14401.032604] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs"
disables this message.
[14401.032608] flush-253:0     D ffffffff81823020     0 25632      2 0x00000000
[14401.032615]  ffff88003c02bac0 0000000000000046 ffffffff81425a7f
ffff8800cf06f5c0
[14401.032623]  ffff8800cf06f580 ffffffff81823020 ffff88001666ffd8
ffff88001666ffd8
[14401.032632]  ffff88003c02bcf8 0000000000004000 ffff88001666ffd8
ffff88003c02bd00
[14401.032639] Call Trace:
[14401.032645]  [<ffffffff81425a7f>] ? schedule+0x49f/0xcb0
[14401.032653]  [<ffffffff8105f465>] ? sched_clock_local+0x15/0x80
[14401.032662]  [<ffffffff81343287>] ? get_active_stripe+0x307/0x6f0
[14401.032669]  [<ffffffff81032ab0>] ? try_to_wake_up+0x210/0x210
[14401.032676]  [<ffffffff81346b38>] ? make_request+0x198/0x660
[14401.032683]  [<ffffffff8135b4fa>] ? __map_bio+0x4a/0x1d0
[14401.032690]  [<ffffffff810592d0>] ? abort_exclusive_wait+0xb0/0xb0
[14401.032697]  [<ffffffff8134d563>] ? md_make_request+0x103/0x250
[14401.032704]  [<ffffffff81204c67>] ? generic_make_request+0x2f7/0x570
[14401.032710]  [<ffffffff810f7399>] ? kmem_cache_alloc+0x169/0x180
[14401.032718]  [<ffffffff8135bff4>] ? dm_get_live_table+0x44/0x60
[14401.032724]  [<ffffffff81360225>] ? linear_merge+0x45/0x50
[14401.032731]  [<ffffffff81204f4d>] ? submit_bio+0x6d/0x100
[14401.032738]  [<ffffffff8118296c>] ? ext4_io_submit+0x1c/0x50
[14401.032744]  [<ffffffff81182ac1>] ? ext4_bio_write_page+0x121/0x370
[14401.032751]  [<ffffffff8117c137>] ? mpage_da_submit_io+0x347/0x450
[14401.032759]  [<ffffffff81180eae>] ? mpage_da_map_and_submit+0x1ce/0x420
[14401.032766]  [<ffffffff81181920>] ? ext4_da_writepages+0x340/0x620
[14401.032774]  [<ffffffff812071f7>] ? blk_flush_plug_list+0xa7/0x250
[14401.032782]  [<ffffffff8112c41e>] ? writeback_single_inode+0x10e/0x270
[14401.032789]  [<ffffffff8112c801>] ? writeback_sb_inodes+0xf1/0x1b0
[14401.032796]  [<ffffffff814297ee>] ? reschedule_interrupt+0xe/0x20
[14401.032803]  [<ffffffff8112d36b>] ? writeback_inodes_wb+0x7b/0x150
[14401.032810]  [<ffffffff8112d8d3>] ? wb_writeback+0x493/0x4f0
[14401.032818]  [<ffffffff8111fec2>] ? get_nr_inodes+0x42/0x60
[14401.032825]  [<ffffffff8112d9c7>] ? wb_check_old_data_flush+0x97/0xa0
[14401.032832]  [<ffffffff8112db3f>] ? wb_do_writeback+0x16f/0x210
[14401.032839]  [<ffffffff81046dd0>] ? init_timer_deferrable_key+0x10/0x10
[14401.032846]  [<ffffffff8112dc5b>] ? bdi_writeback_thread+0x7b/0x310
[14401.032852]  [<ffffffff8102d149>] ? __wake_up_common+0x49/0x80
[14401.032860]  [<ffffffff8112dbe0>] ? wb_do_writeback+0x210/0x210
[14401.032866]  [<ffffffff81058a0f>] ? kthread+0x7f/0x90
[14401.032873]  [<ffffffff81429a54>] ? kernel_thread_helper+0x4/0x10
[14401.032880]  [<ffffffff81058990>] ? kthread_worker_fn+0x180/0x180
[14401.032887]  [<ffffffff81429a50>] ? gs_change+0xb/0xb
[14404.915260] ata10: link is slow to respond, please be patient (ready=0)
[14409.448594] ata10: SRST failed (errno=-16)
[14409.448604] ata10: hard resetting link
[14414.935260] ata10: link is slow to respond, please be patient (ready=0)
[14431.895309] ata10: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[14431.909004] ata10.00: configured for UDMA/33
[14431.909026] ata10: EH complete
[14434.040581] ata10.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6
[14434.040589] ata10.00: edma_err_cause=00000084 pp_flags=00000001,
dev error, EDMA self-disable
[14434.040597] ata10.00: failed command: READ DMA EXT
[14434.040609] ata10.00: cmd 25/00:08:10:e0:59/00:00:b2:00:00/e0 tag 0
dma 4096 in
[14434.040612]          res 51/89:08:10:e0:59/89:00:b2:00:00/e0 Emask
0x10 (ATA bus error)
[14434.040617] ata10.00: status: { DRDY ERR }
[14434.040622] ata10.00: error: { ICRC }
[14434.040631] ata10: hard resetting link
[14439.525256] ata10: link is slow to respond, please be patient (ready=0)
[14444.058589] ata10: SRST failed (errno=-16)
[14444.058600] ata10: hard resetting link
[14449.545254] ata10: link is slow to respond, please be patient (ready=0)
[14454.078594] ata10: SRST failed (errno=-16)
[14454.078604] ata10: hard resetting link
[14459.565256] ata10: link is slow to respond, please be patient (ready=0)
[14476.525289] ata10: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[14476.579007] ata10.00: configured for UDMA/33
[14476.579038] sd 9:0:0:0: [sdh] Device not ready
[14476.579043] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_OK
driverbyte=DRIVER_SENSE
[14476.579049] sd 9:0:0:0: [sdh]  Sense Key : Not Ready [current] [descriptor]
[14476.579057] Descriptor sense data with sense descriptors (in hex):
[14476.579061]         72 02 04 00 00 00 00 0c 00 0a 80 00 00 00 00 00
[14476.579076]         b2 59 e0 10
[14476.579083] sd 9:0:0:0: [sdh]  Add. Sense: Logical unit not ready,
cause not reportable
[14476.579091] sd 9:0:0:0: [sdh] CDB: Read(10): 28 00 b2 59 e0 10 00 00 08 00
[14476.579106] end_request: I/O error, dev sdh, sector 2992234512
[14476.579147] ata10: EH complete
[14484.352060] ata10.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
[14484.352070] ata10.00: failed command: SMART
[14484.352082] ata10.00: cmd b0/d8:00:00:4f:c2/00:00:00:00:00/00 tag 0
[14484.352084]          res 40/00:08:10:e0:59/89:00:b2:00:00/e0 Emask
0x4 (timeout)
[14484.352090] ata10.00: status: { DRDY }
[14484.352099] ata10: hard resetting link
[14489.838590] ata10: link is slow to respond, please be patient (ready=0)
[14494.371940] ata10: SRST failed (errno=-16)
[14494.371951] ata10: hard resetting link
[14499.858587] ata10: link is slow to respond, please be patient (ready=0)
[14504.391923] ata10: SRST failed (errno=-16)
[14504.391933] ata10: hard resetting link
[14509.878583] ata10: link is slow to respond, please be patient (ready=0)
[14536.995640] nfsd: last server has exited, flushing export cache
[14539.425250] ata10: SRST failed (errno=-16)
[14539.425263] ata10: hard resetting link
[14544.431917] ata10: SRST failed (errno=-16)
[14544.431926] ata10: reset failed, giving up
[14544.431932] ata10.00: disabled
[14544.431973] ata10: EH complete
[14544.432042] sd 9:0:0:0: [sdh] Unhandled error code
[14544.432062] sd 9:0:0:0: [sdh] Unhandled error code
[14544.432080] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.432111] sd 9:0:0:0: [sdh]
[14544.432126] sd 9:0:0:0: [sdh] CDB: Read(10)Result:
hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[14544.432163] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 e1 5a ab 00 00 00 08
[14544.432216] sd 9:0:0:0: [sdh] Unhandled error code
[14544.432232]  00
[14544.432240] sd 9:0:0:0: [sdh]
[14544.432253] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[14544.432272] end_request: I/O error, dev sdh, sector 3780815616
[14544.432290] sd 9:0:0:0: [sdh] CDB:
[14544.432305] md/raid:md0: Disk failure on sdh1, disabling device.
[14544.432321] md/raid:md0: Operation continuing on 6 devices.
[14544.432336] Write(10): 2a 00 e1 5a ef 78 00 00 80 00
[14544.432389] end_request: I/O error, dev sdh, sector 3780833144
[14544.432412] : 28 00 b2 33 44 80 00 00 08 00
[14544.432433] end_request: I/O error, dev sdh, sector 2989704320
[14544.432453] sd 9:0:0:0: [sdh] Unhandled error code
[14544.432471] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.432498] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 e1 5a ef f8 00 00 80 00
[14544.432553] end_request: I/O error, dev sdh, sector 3780833272
[14544.432618] sd 9:0:0:0: [sdh] Unhandled error code
[14544.432639] sd 9:0:0:0: [sdh] Unhandled error code
[14544.432659] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.432687] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 b2 59 e0 10 00 00 08 00
[14544.432749] end_request: I/O error, dev sdh, sector 2992234512
[14544.432774] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.432785] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00
[14544.432800] sd 9:0:0:0: [sdh] Unhandled error code
[14544.432820] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.432849] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 e1 5a eb 00 00 00 80 00
[14544.432910] end_request: I/O error, dev sdh, sector 3780832000
[14544.432933]  e1 5a f0 78 00 00 80 00
[14544.432949] end_request: I/O error, dev sdh, sector 3780833400
[14544.432965] sd 9:0:0:0: [sdh] Unhandled error code
[14544.432972] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.432982] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 e1 5a ef 00 00 00 78 00
[14544.433002] end_request: I/O error, dev sdh, sector 3780833024
[14544.433012] sd 9:0:0:0: [sdh] Unhandled error code
[14544.433033] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.433062] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 e1 5a f0 f8 00 00 80 00
[14544.433121] end_request: I/O error, dev sdh, sector 3780833528
[14544.433205] sd 9:0:0:0: [sdh] Unhandled error code
[14544.433227] sd 9:0:0:0: [sdh] Unhandled error code
[14544.433247] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.433276] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 e1 5a f1 78 00 00 80 00
[14544.433333] end_request: I/O error, dev sdh, sector 3780833656
[14544.433357] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.433366] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 2e 8d e7 b0 00 00 28 00
[14544.433387] end_request: I/O error, dev sdh, sector 781051824
[14544.433399] sd 9:0:0:0: [sdh] Unhandled error code
[14544.433408] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.433419] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 e1 5a f1 f8 00 00 80 00
[14544.433440] end_request: I/O error, dev sdh, sector 3780833784
[14544.433487] sd 9:0:0:0: [sdh] Unhandled error code
[14544.433493] sd 9:0:0:0: [sdh]  Result: hostbyte=DID_BAD_TARGET
driverbyte=DRIVER_OK
[14544.433502] sd 9:0:0:0: [sdh] CDB: Write(10): 2a 00 e1 5a f2 78 00 00 08 00
[14544.433523] end_request: I/O error, dev sdh, sector 3780833912
[14544.488761] RAID conf printout:
[14544.488772]  --- level:6 rd:7 wd:6
[14544.488779]  disk 0, o:1, dev:sdg1
[14544.488783]  disk 1, o:1, dev:sdb1
[14544.488788]  disk 2, o:1, dev:sdd1
[14544.488793]  disk 3, o:1, dev:sdc1
[14544.488797]  disk 4, o:1, dev:sdf1
[14544.488801]  disk 5, o:0, dev:sdh1
[14544.488805]  disk 6, o:1, dev:sde1
[14544.515279] RAID conf printout:
[14544.515289]  --- level:6 rd:7 wd:6
[14544.515295]  disk 0, o:1, dev:sdg1
[14544.515299]  disk 1, o:1, dev:sdb1
[14544.515304]  disk 2, o:1, dev:sdd1
[14544.515308]  disk 3, o:1, dev:sdc1
[14544.515313]  disk 4, o:1, dev:sdf1
[14544.515317]  disk 6, o:1, dev:sde1
[14570.639011] nvidia 0000:00:03.5: PCI INT B disabled
[14570.639441] nvidia 0000:03:00.0: PCI INT A disabled
[14591.505699] HDA Intel 0000:00:08.0: PCI INT A disabled
 ~ $ dmesg > /srv/http/dmesg-failing-harddrive.log
 ~ $ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid6 sdh1[6](F) sdg1[0] sdf1[5] sde1[7] sdd1[4] sdb1[1] sdc1[3]
      9751756800 blocks super 1.2 level 6, 64k chunk, algorithm 2
[7/6] [UUUUU_U]

unused devices: <none>
 ~ $

$ mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Tue Oct 19 08:58:41 2010
     Raid Level : raid6
     Array Size : 9751756800 (9300.00 GiB 9985.80 GB)
  Used Dev Size : 1950351360 (1860.00 GiB 1997.16 GB)
   Raid Devices : 7
  Total Devices : 7
    Persistence : Superblock is persistent

    Update Time : Sun Jul 31 19:07:25 2011
          State : clean, degraded
 Active Devices : 6
Working Devices : 6
 Failed Devices : 1
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 64K

           Name : ion:0  (local to host ion)
           UUID : e6595c64:b3ae90b3:f01133ac:3f402d20
         Events : 6158774

    Number   Major   Minor   RaidDevice State
       0       8       97        0      active sync   /dev/sdg1
       1       8       17        1      active sync   /dev/sdb1
       4       8       49        2      active sync   /dev/sdd1
       3       8       33        3      active sync   /dev/sdc1
       5       8       81        4      active sync   /dev/sdf1
       5       0        0        5      removed
       7       8       65        6      active sync   /dev/sde1

       6       8      113        -      faulty spare   /dev/sdh1

Shutting down the LV:

$ vgchange -an lvstorage
  /dev/sdh: read failed after 0 of 4096 at 0: Input/output error
  /dev/sdh: read failed after 0 of 4096 at 2000398843904: Input/output error
  /dev/sdh: read failed after 0 of 4096 at 2000398925824: Input/output error
  /dev/sdh: read failed after 0 of 4096 at 4096: Input/output error
  /dev/sdh1: read failed after 0 of 4096 at 2000397795328: Input/output error
  /dev/sdh1: read failed after 0 of 4096 at 2000397877248: Input/output error
  /dev/sdh1: read failed after 0 of 4096 at 0: Input/output error
  /dev/sdh1: read failed after 0 of 4096 at 4096: Input/output error
  0 logical volume(s) in volume group "lvstorage" now active

Removing the bad HDD:

$ mdadm --manage /dev/md0 --remove /dev/sdh1
mdadm: hot removed /dev/sdh1 from /dev/md0

$ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid6 sdg1[0] sdf1[5] sde1[7] sdd1[4] sdb1[1] sdc1[3]
      9751756800 blocks super 1.2 level 6, 64k chunk, algorithm 2
[7/6] [UUUUU_U]

unused devices: <none>

 $ mdadm -D /dev/md0
/dev/md0:
        Version : 1.2
  Creation Time : Tue Oct 19 08:58:41 2010
     Raid Level : raid6
     Array Size : 9751756800 (9300.00 GiB 9985.80 GB)
  Used Dev Size : 1950351360 (1860.00 GiB 1997.16 GB)
   Raid Devices : 7
  Total Devices : 6
    Persistence : Superblock is persistent

    Update Time : Sun Jul 31 19:13:02 2011
          State : clean, degraded
 Active Devices : 6
Working Devices : 6
 Failed Devices : 0
  Spare Devices : 0

         Layout : left-symmetric
     Chunk Size : 64K

           Name : ion:0  (local to host ion)
           UUID : e6595c64:b3ae90b3:f01133ac:3f402d20
         Events : 6158779

    Number   Major   Minor   RaidDevice State
       0       8       97        0      active sync   /dev/sdg1
       1       8       17        1      active sync   /dev/sdb1
       4       8       49        2      active sync   /dev/sdd1
       3       8       33        3      active sync   /dev/sdc1
       5       8       81        4      active sync   /dev/sdf1
       5       0        0        5      removed
       7       8       65        6      active sync   /dev/sde1

I'll shut down the system now and remove the HDD. I suppose I've just
one question to ask then; should I rescrub the array when it's up with
1 HDD removed?

Thanks again,
Mathias
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