Re: [Xen-devel] [RFC V10 0/4] domain snapshot document

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 30/01/2015 14:38, Wei Liu ha scritto:
> On Thu, Jan 29, 2015 at 04:36:43PM +0000, Ian Campbell wrote:
> > On Mon, 2015-01-26 at 11:25 +0800, Chunyan Liu wrote:
> > > Changes to V9:
> > This looks good to me, thanks.
> >
> > Ian/Wei do you have any comments? xapi folks?
> Looks good to me.
>
> Wei.
I looked to the project of domain snapshot and seems good.

I have only a question.
I saw this:
> Disk snapshot can be created by many external tools, like qemu-img,
> vhd-util and lvm, etc.
Wouldn't it be good to also use btrfs for external disks snapshot?
Even if btrfs snapshots works on subvolumes (directories) it is possible 
to atomically creates a copy-on-write snapshot of a file (with domUs 
disks on file, including raw) with btrfs clone operation (reflink 
systemcall, eg: cp --reflink source dest)

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