Re: bad block management

[Edward Shishkin <edward.shishkin@gmail.com>]

Jeff Mahoney wrote:

> Ric Wheeler wrote:
>
> >Christian Kujau wrote:
>
> >>On Mon, 31 Mar 2008, kgp wrote:
> >>
> >>>How ReiserFS manages bad blocks?
> >>
> >>Is reiserfsck's --badblocks option helpful?
> >>
> >>>If it is not supporting bad block management, plz tell me the
> >>>approches we
> >>>can use to implement bad block management in any file system. I am
> >>>implementing bad block manager for UDF. I want some inputs
> >>
> >>Doesn't "Spared UDF" already provide some kind of bad block management?
> >>
> >>C.
>
> >I am not sure what you want to do with bad block management.
>
> >With most modern disk drives, they will remap bad disk sectors
> >dynamically for you so the file system layer can stay out of the bad
> >block mapping business entirely.
>
>
> He's asking about UDF, though, so I'd imagine he's talking about optical
> media. It's even cheaper than disk though, so I guess I don't see the
> benefit.
>
> Reiserfs handles bad blocks by allocating the blocks input as "known
> bad" to special file that's inaccessible. It does _not_ do this
> automatically, and reiserfsck/mkreiserfs must be passed a list of blocks
> to allocate to that file. It also doesn't recover files that have been
> corrupted to the block failure.


Here are the instructions:
http://chichkin_i.zelnet.ru/bad-block-handling.html

>
> Ric's right about disk drives, though. They'll remap the bad sectors
> automatically at the hardware level. When you start to see bad sectors
> at the file system level, it means that the sectors reserved for
> remapping have been exhausted and you should replace the disk.
>
> -Jeff
>
> --
> Jeff Mahoney
> SUSE Labs

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