Re: New filesystem for Linux
[email protected], [email protected],
[email protected]
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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