Re: [linux-lvm] Snapshots and disk re-use

[Jonathan Tripathy <jonnyt abpni co uk>]

On 24/02/11 00:37, Jonathan Tripathy wrote:
> On 24/02/11 00:32, Stuart D. Gathman wrote:
> > On Thu, 24 Feb 2011, Jonathan Tripathy wrote:
> >
> > > So I'm guessing then, that when a snapshot is created for an origin, 
> > > then
> > > there are 2 physical copies of the data on disk? (Albeit only one is
> > > accessible at the regular filesystem level)
> > NO, NO, NO.  There is still only *one* physical copy of the data
> > after creating a snapshot.  You have simply created a "branch point"
> > which can now diverge as each branch is written to.
> Then why was it suggested that I should zero my new customer LVs upon 
> creation? Please remember that my snapshots will not be written to
However the origin will be written to as it will be in use...