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List:       smartmontools-support
Subject:    [smartmontools-support] pending sector: bad blocks howto doesnt work
From:       Juergen Bausa <Juergen.Bausa () web ! de>
Date:       2009-06-27 20:25:19
Message-ID: 1009646794 () web ! de
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I use debian lenny on my system and have enabled smartmon testing. For some days now 
I receive emails telling me that there are pending sectors:

Device: /dev/sda, 1 Offline uncorrectable sectors

Thus, I read the 'Bad block HOWTO for smartmontools' and tried to correct the \
problem.  However, it does not work. Here is what I did:

I listed the selftest errors inorder to find out the bad block:

> lisa:/home/jba/comp/hardware/harddisks/HD103UI# smartctl -l selftest /dev/sda
> smartctl version 5.38 [i686-pc-linux-gnu] Copyright (C) 2002-8 Bruce Allen
> Home page is http://smartmontools.sourceforge.net/
> 
> === START OF READ SMART DATA SECTION ===
> SMART Self-test log structure revision number 1
> Num  Test_Description    Status                  Remaining  LifeTime(hours)  \
> LBA_of_first_error # 1  Short offline       Completed: read failure       20%      \
> 2363         1116720298 # 2  Short offline       Completed: read failure       20%  \
> 2351         1116720298 # 3  Short offline       Completed without error       00%  \
>                 2329         -
> ...

Ok, error is on LBA 1116720298. I then looked into fdisk to find out, to which \
partition  the LBA belongs:

> lisa:/home/jba/comp/hardware/harddisks/HD103UI# fdisk -lu /dev/sda
> 
> Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
> 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Disk identifier: 0x000da0a1
> 
> Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *          63    78140159    39070048+   c  W95 FAT32 (LBA)
> /dev/sda2        78140160    82060019     1959930   82  Linux swap / Solaris
> /dev/sda3        82060020   199270259    58605120   83  Linux
> /dev/sda4       199270260  1953520064   877124902+   5  Extended
> /dev/sda5       199270323  1566466019   683597848+  83  Linux
> /dev/sda6      1566466083  1953520064   193526991   83  Linux

The bad LBA is in sda5. The I looked for the block size:

> lisa:/home/jba/comp/hardware/harddisks/HD103UI# tune2fs -l /dev/sda5 | grep Block
> Block count:              170899462
> Block size:               4096
> Blocks per group:         32768

Block size is 4096. Thus, the bad block calulates as

b = (int)((L-S)*512/B)  = (int) (1116720298 - 199270323) * 512 / 4096 = (int) \
114681246.88 = 114681246

This should be the block number.

> lisa:/home/jba/comp/hardware/harddisks/HD103UI# debugfs
> debugfs 1.41.3 (12-Oct-2008)
> debugfs:  open /dev/sda5
> debugfs:  icheck 114681246
> Block   Inode number
> 114681246       <block not found>

But debugfs does not find a corresponding Inode for this block. What does this mean?

It seems that the buggy sector isnt used at all. But why does smart report an error \
then?  Could it be, that the block was used before for, but the file was erased in \
the meantime?

What shoul I do? just overwriting the block with dd (dd if=/dev/zero of=/dev/hda3 \
bs=4096 count=1 seek=114681246)?

Juergen










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