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From: Joe Thornber <thornber@redhat.com>
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Date: Wed, 23 Feb 2011 14:16:04 +0000
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Subject: Re: [linux-lvm] Snapshots and disk re-use
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On Wed, 2011-02-23 at 13:57 +0000, Jonathan Tripathy wrote:

> The snapshot will be done in the Xen host, so the Xen host will see the 
> snapshot. The VM will only see the "normal" LV (and continue to use it 
> as normal). My concern is what happens when I remove the snapshot and 
> later on I create a new additional LV for a new customer.

When you remove the snapshot the exception store will have bits of the
origin device on it.  Zero it before you use the space to provision a
volume for a new customer.

- Joe