zvol (interface) does not just  'export raw device' but rather
implements volume  abstraction and integrates volume management into
file-system.

Regards,
Andrey



On Sun, Apr 12, 2009 at 11:26 AM, Sébastien Wacquiez <s...@enix.org> wrote:
> Hi,
>
> A nice feature is ZFS is the "ZVOL" layer, that permit you to export
> (directly) a raw device from your zfs pool of disc, with the benefit of
> powerful (growing!) snapshot and easy raid management from zfs. It's
> particulary usefull when you use it with virtual server, allowing you to
> centralize all your backup problematic, etc
>
> Does btrfs plan to support this kind of feature ? (please, don't tell me
> that lvm do, lvm just sucks when you make a snapshot of your disk, and lack
> of the "growing", commit, rollback, diffsend feature).
>
> Thanks !
>
>
> Sébastien Wacquiez
>
> PS : see http://opensolaris.org/os/community/zfs/source/zfstour.png if you
> don't know what zvol do.
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