help regarding ext4 extend and multiblock allocation

[Mulyadi Santosa]

Hi Swapnil...

On Thu, Dec 29, 2011 at 10:42, Swapnil Gaikwad <swapnilgaik72 at gmail.com> wrote:
> How the extend is different from block allocation?

The way I see extent is: it's like doing cluster allocation. Meaning,
you don't allocate it one by one, but as a whole.

For example, with extent size 1 MB and block size 4 KB, it means
filesystem allocate 256 blocks at once.

Although it sounds like multi block allocation or read ahead, I think
the underlying implementation is a bit different. Sorry, this is the
best I know

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

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