[linux-lvm] Snapshots and disk re-use

Stuart D. Gathman stuart at bmsi.com
Thu Feb 24 00:32:01 UTC 2011

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.

	      Stuart D. Gathman <stuart at bmsi.com>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flammis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.

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