Re: e2fsck: HOWTO tutorial
On Tue, Jun 22, 2010 at 1:33 PM, Augustin <beginner2005@masquilier.org> wrote:
>
> Hello,
>
> I must learn to use e2fsck as I am having some I/O problems on some of
> my external drives.
> I checked all the existing documentation everywhere I could think of
> (including the Debian official documentation and existing HOWTOs from
> TLDP), but couldn't find anything that is detailed and explicit enough
> for my taste.
>
> I am left with some questions that I hope some of you will be able to
> answer.
>
> 1st, is there a way to run e2fsck in a strictly non-destructive but
> informative way, to check the health of a drive?
> (question asked here: http://linux.overshoot.tv/ticket/112 ).
-c
This option causes e2fsck to use badblocks(8) program to do a
read-only scan of the device in order to find any bad blocks. If any
bad blocks are found, they are added to the bad block inode to
prevent them from being allocated to a file or directory. If this
option is specified twice, then the bad block scan will be done using
a non-destructive read-write test.
is this what you want?
combine it with "-n" and check the exit code to see if errors are found.
> 2nd, to the dreaded question:
>
> # e2fsck -vfFC0 /dev/sdc1
> e2fsck 1.41.9 (22-Aug-2009)
> Pass 1: Checking inodes, blocks, and sizes
> Error reading block 34308186 (Attempt to read block from filesystem
> resulted in short read) while getting next inode from scan. Ignore
> error?
>
> What are the consequences of answering either way?
> As far as I can tell: answering yes will delete the inode, i.e. data
> will be lost. Answering no will leave the bad block in place and the
> problem will remain.
>
>
> I have more questions on the topic but this should be a start.
>
>
> All your answers will be used to compile hopefully the best available
> tutorial on this important topic for a Linux system administrator.
> This is barely more than a stub:
> http://linux.overshoot.tv/wiki/hardware/e2fsck_file_system_check
>
> Thanks for your help,
>
> Augustin.
Tao
--
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