vol-wipe and delete

["Shawn Davis" <sdavis17@xxxxxxxxxxxx>]

Hello all,

 

I know libvirt has the following two commands:

 

vol-wipe

 

vol-delete

 

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?  I know Eucalyptus and KVM use sparse files upon instance creation and the instance thinks the ephemeral space is all zeroes even though it is just sparse.   I appreciate any insight in how the two virsh commands work and if they use zeroes, sparse, or some other method.

 

Thanks,

Shawn