Re: Fixing a crashed disk

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On 10/26/2012 07:51 PM, Robert Nichols wrote:
> On 10/26/2012 06:29 PM, Steven Stern wrote:
>> I quite stupidly unplugged my computer today when my foot got tangled in
>> the power strip.  On reboot, I was notified
>>
>> Device: /dev/sda [SAT], 8 Offline uncorrectable sectors
>>
>> Smartctl tells me the problem is at LBA 2014551336 (this is a 2TB disk).
>>
>>
>> Following the info here
>>
>> http://kaivanov.blogspot.com/2010/09/fixing-disk-problems-under-linux-with.html
>>
>>
>> I'm not able to determine what file might be sitting on this block.
>>
>> tune2fs -l /dev/sda5 |grep Block
>> Block count:              472552448
>> Block size:               4096
>> Blocks per group:         32768
>> [root@sds-desk-2 ~]# debugfs
>> debugfs 1.42.3 (14-May-2012)
>> debugfs:  open /dev/sda5
>> debugfs:  icheck 235992741
>> Block   Inode number
>> 235992741       8
>> debugfs:  ncheck 8
>> Inode   Pathname
>>
>> This suggests that the problem is not in a currently extant file.
>>
>> I'm now trying the suggestion of writing from /dev/zero to a file in
>> /home while in single users mode.  Given that I have 1.5TB to fill,
>> this could take a while.
>>
>> Here's the question:  If I just reformat and restore /home from a
>> recent backup, will the disk automatically deal with the sectors
>> pending reallocation?
> 
> The pending sectors will be reallocated only when they are written to. 
> Unless
> invoked with the very slow "-cc" option, mke{2,3,4}fs will write only to
> the
> metadata areas, and restoring /home will of course not write to any
> remaining
> free space.
> 

The gods of stupidity have been good to me.  I had a backup of
everything on /home that wasn't stored in the cloud, so I cleared all
the files on /home, restored from my backups, and smartctl reports the
sectors have been moved; 0 sectors are pending reallocation.

I got lucky.

-- 
-- Steve
-- 
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