[Sheepdog] [PATCH] sheep: use hash value for vdi attribute object id

[MORITA Kazutaka]

At Wed, 3 Aug 2011 15:41:31 +0100,
Chris Webb wrote:
> 
> Chris Webb <chris at arachsys.com> writes:
> 
> > MORITA Kazutaka <morita.kazutaka at lab.ntt.co.jp> writes:
> > 
> > > Let me clarify some points.
> > > 
> > > In this approach, when we rename a vdi, we specify the vdi 'id' and
> > > change the attribute of the vdi, yes?
> > > 
> > > What is specified in the qemu command line option as a Sheepdog volume
> > > name?  Is it vdi 'name' (an attribute of the vdi) or vdi 'id' (the 32
> > > bit integer)?
> > 
> > I was imagining that the vdi was internally addressed by its 'id' and the
> > name was just an attribute for user convenience, a bit like we fundamentally
> > identify snapshots by their vid but might one day give them a convenience
> > tag name as qcow2 snapshots have. I'm already using the vdi 'name' in this
> > way inside our management system, allocating a unique value to it rather
> > than setting it to the user-provided drive name.
> 
> ...and thus the 'id' is what's passed on the qemu command line.

Thanks for your explanation.  This is a good use case for Sheepdog vdi
attributes.

Kazutaka