Once upon a time, Robert Nichols <rnicholsNOSPAM at comcast.net> said: > On 02/08/2016 07:04 PM, Chris Adams wrote: > >For that purpose, use something that can TRIM a VM image, like > >virt-sparsify. > > That's doing the same thing. > > virt-sparsify works by mounting the filesystem, filling it to capacity > with zeros, then performing a copy operation which skips over the > all-zero blocks, leaving them unallocated in the sparse destination > file. Well, that's the slow method that copies the image. There's also the in-place method, which just does a TRIM that pokes holes in the original image (much faster and uses no extra disk space). -- Chris Adams <linux at cmadams.net>