On Mon, Oct 01, 2001 at 01:48:50PM +0530, Kingsly John wrote:
> On Mon, 1 Oct 2001, H.S.Rai wrote:
>
> |With passage of time the percentage of non-contiguous on
> |various partitions go on increasing. Is there any upper
> |acceptable limit for this, and what is the harm of high
> value?
>
> it's about the same as fragmentation in the windoze world
> ... but fragmentation on ext2fs is pretty limited because
> its a *smart* file system as compared to FAT.
>
> It'll make you system slower as the value keeps increasing
> ... esp. if the files that you are using are heavily frag-
> mented.
>
> |Is there any way to reset this equal to zero.
>
> One sure fire way to do it...
>
> move all the contents of that partition to another partit-
> ion (make the original partition empty (except for lost+
> found)) and then move the contents back to the original
> partion... this will make the system 100% unfragmented.
>
---end quoted text---
I agree with you here, Kingsly, that best way is to start on
clean slate. Just a few points (from personal experience):
a) If at the time of creating a file partition with mke2fs,
if you keep the block size small (viz 1024 instead of the
default 4096), fragmentation reduces subsequently.
b) There will hardly be any significant drop of speed till
the fragmentation level crosses about 10-12 %
c) Fragmentation for the first 4-5% comes pretty fast, but
takes a long time to reach 10%.
d) Unless it crosses 10%, do not bother ...
My 2p !
Bish.
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