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List:       libvirt-users
Subject:    Re: [libvirt-users] vol-wipe and delete
From:       Eric Blake <eblake () redhat ! com>
Date:       2012-04-11 14:49:45
Message-ID: 4F859A09.6060708 () redhat ! com
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On 04/10/2012 06:20 PM, Shawn Davis wrote:
> Hello all,
> 
>  
> 
> I know libvirt has the following two commands:
> 
>  
> 
> vol-wipe

calls virStorageVolWipe or virStorageVolWipePattern (depending on
arguments), which overwrites the existing data with all 0 or with a
specific pattern.  The file stays intact, but future uses of the file
will no longer see the data that had been there previously.

> 
>  
> 
> vol-delete

calls virStorageVolDelete, which removes the file but does not wipe it
(so the data is still present on the backing storage device).

> 
>  
> 
> Can someone please explain to me how these function?  Do these only remove
> previous session data so that a new virtual instance cannot see it or does
> it remove it at the physical level level too so that the data cannot be
> found anywhere on the physical drive?

If you want the data removed at the physical layer, use vol-wipe.

-- 
Eric Blake   eblake@redhat.com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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