On Mar 26, 2010, at 23:37, David Dyer-Bennet <d...@dd-b.net> wrote:
On Fri, March 26, 2010 14:25, Malte Schirmacher wrote:
Bob Friesenhahn wrote:
Except that ZFS does not support RAID0. I don't know why you guys
persist with these absurd claims and continue to use wrong and
misleading terminology.
What is the main difference between RAID0 and striping (what zfs
really
does, i guess?)
RAID creates fixed, absolute, patterns of spreading blocks, bytes, and
bits around the various disks; ZFS does not, it makes on-the-fly
decisions
about where things should go at some levels. In RAID1, a block will
go
the same physical place on each drive; in a ZFS mirror it won't, it'll
just go *somewhere* on each drive.
This is not correct. In ZFS mirror a block will go to the same offset
within data area on both submirrors.
But if you set up your mirrored slices starting at different offsets
you can arrange for blocks on submirrors to have different physical
offsets ;-)
In the end, RAID produces a block device that you then run a
filesystem
on, whereas ZFS includes the filesystem (and other things; including
block
devices you can run other filesystems on).
--
David Dyer-Bennet, d...@dd-b.net; http://dd-b.net/
Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/
Photos: http://dd-b.net/photography/gallery/
Dragaera: http://dragaera.info
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