Ext3 File System: Dynamic Reorganization

Christopher Chan christopher.chan at bradbury.edu.hk
Fri Feb 19 02:05:13 UTC 2010

On Friday, February 19, 2010 09:33 AM, MirJafar Ali wrote:
> Hello,
> I am wondering why this is not implemented and available, when there are
> so many articles written in late 90's showing great performance
> improvements.

Are you referring to articles about dumb filesystems such as fat? You 
still have not given an example of a filesystem that actually implements 
what you were asking for. Maybe it is not such a fantastic idea afterall.

> I was thinking because I could not find any de-fragmentation tool for
> Linux similar to windows, so I was assumings that probably Linux file
> systems are smart and they must be reorganizing behind the hood.

Your assumption about file systems under Linux being smart is correct 
but not in the way you imagine. They are, in fact, so much smarter that 
they do not need to do any defragmentation...most of them anyway.

> Thanks
> Mir
> On Thu, Feb 18, 2010 at 7:03 PM, Christopher Chan
> <christopher.chan at bradbury.edu.hk
> <mailto:christopher.chan at bradbury.edu.hk>> wrote:
>     On Friday, February 19, 2010 08:16 AM, MirJafar Ali wrote:
>      > Hello,
>      >
>      > I have one question regarding ext3/ext4 filesystem. I have some
>     expert
>      > will answer it.
>      >
>      > Does ext3/ext4 filesystem perform dynamic disk reorganization for
>      > frequently access data ?
>     Name me one filesystem that does that. The closest thing that I can
>     think of is online defragmentation on XFS but that is not automatic
>     which is what I think you are alluding to as well.
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