Re: Blatant layering violations (was Re: ext4 features)

Tom Vier
2006-07-06T20:05:11Z

On Wed, Jul 05, 2006 at 05:36:39PM -0700, Valerie Henson wrote:
> On Mon, Jul 03, 2006 at 10:55:23PM +0200, Tomasz Torcz wrote:
> >
> > ZFS was already called ,,blatant layering violation''. ;)

It buys you some preformance. Someone here already mentioned variable stripe
sizes. ZFS doesn't just add a checksum sector after each block (something
i've been planning to write an md module for, for a couple years). It writes
the checksum at the end of the tree member, inode, dirent, whatever. So
there's no read-modify-write when you write < 1 checksum block size.

One thing i noticed about zfs that surprised me: it's using indirect blocks,
from what i saw.

--
Tom Vier <tmv@comcast.net>
DSA Key ID 0x15741ECE