On Jul 23, 2010, at 7:14 PM, Edward Ned Harvey <sh...@nedharvey.com> wrote:
>> From: Arne Jansen [mailto:sensi...@gmx.net] >>> >>> Can anyone else confirm or deny the correctness of this statement? >> >> As I understand it that's the whole point of raidz. Each block is its >> own >> stripe. > > Nope, that doesn't count for confirmation. It is at least theoretically > possible to implement raidz using techniques that would (a) unintelligently > stripe all blocks (even small ones) across multiple disks, thus hurting > performance on small operations, or I think you will find that for writes, especially small writes (<32k or so) the method used by raid performs much better than raid-5. > (b) implement raidz such that striping > of blocks behaves differently for small operations (plus parity). So the > confirmation I'm looking for would be somebody who knows the actual source > code, and the actual architecture that was chosen to implement raidz in this > case. http://src.OpenSolaris.org -- richard > _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
