Re: icheck and ncheck on ReiserFS to convert bad sector numbers to filenames

[Edward Shishkin <edward@namesys.com>]

Chris Witham wrote:

> I have a hard drive which has failed.  I posted about it here[1], and
> was referred to ddrescue[2] to create an image of the failed disk.
> This was successful, and I now have an image of the drive, including
> the 1688 bad sectors that couldn't be read.  The logfile lists all the
> the bad sectors, and I was referred to these[3] instructions to
> convert the bad sector numbers into filenames that are corrupted.
>

Make sure that blocksize for copy operation performed by dd_rescue
was specified as Reiserfs blocksize (4096) and bad block images were
zeroed, then run reiserfsck on the backup.

> Unfortunately, those instructions involve debugfs, which is
> ext2/ext3-specific.  What little information I was able to find online
> about the icheck and ncheck commands used in the instructions and
> ReiserFS has led me to either complaints that they are not implemented
> for ReiserFS, or some variant of a post[4] to this mailing list that
> suggests using 'find / -type f -exec cat {} > /dev/null \;' at
> watching for the filenames that fail.
>
> That seems like a complete brute force method (scanning over 110GB to
> locate 800kB of bad data!), and will almost certainly return
> inaccurate results because the drive is continuing to fail and will
> return more problems than it experienced initially when the drive
> image was made.  (Not to mention stress the disk further and make any
> more work I may need to do on it more difficult.)
>
> Is there any way to do the equivalent of icheck or ncheck in ReiserFS?
> If not now, are there plans to implement this functionality anytime
> soon?
>
>
> [1] http://www.linuxquestions.org/questions/showthread.php?t=485322
> [2] http://savannah.gnu.org/projects/ddrescue/
> [3] http://smartmontools.sourceforge.net/BadBlockHowTo.txt
> [4] http://marc.theaimsgroup.com/?l=reiserfs&m=114425109321290&w=2
>
>