Re: New filesystem for Linux

[Mikulas Patocka]

> Re: New filesystem for Linux
>
> kangur@xxxxxxxxxx, mikulas@xxxxxxxxxxxxxxxxxxxxxxxx,
> linux-kernel@xxxxxxxxxxxxxxx
>
>
> Grzegorz Kulewski writes:
> > On Thu, 2 Nov 2006, Mikulas Patocka wrote:
> > > As my PhD thesis, I am designing and writing a filesystem,
> > > and it's now in a state that it can be released. You can
> > > download it from http://artax.karlin.mff.cuni.cz/~mikulas/spadfs/
> >
> > "Disk that can atomically write one sector (512 bytes) so that
> > the sector contains either old or new content in case of crash."
>
> New drives will soon use 4096-byte sectors. This is a better
> match for the normal (non-VAX!) page size and reduces overhead.

The drive (IDE model, SCSI can have larger sector size) will do 
read-modify-write for smaller writes. So there should be no compatibility 
issues. (this possibility is in new ATA standard and there is a way how to 
detect physical sector size)

But how will fdisk deal with it? Fdisk by default aligns partitions on 
63-sector boundary, so it will make all sectors misaligned and seriously 
kill performance even if filesystem uses proper 8-sector aligned accesses.

Mikulas
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