As to the first question: with qubes 4.0 it is a bit difficult to effectively 
wipe free space in the default thin pool.

One can create a thin volume and write to it until the thin pool reaches some 
saturation level (99.5%), then hit that volume with blkdiscard before invoking 
lvremove. Because you should not go to 100% the user may still be rolling the 

Lvm doesn’t like hitting 100% and one can permanently corrupt the system if you 
fill the lvm all the way.

It’s possible the lvm tool chain in 4.1 may have more capabilities once dom0 is 
on a much more recent fedora version.

It’d also be nice to have dom0 in a different pool than the templates/ 
reduce catastrophic failures.


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