On 02/08/2016 07:04 PM, Chris Adams wrote: > Once upon a time, Greg Bailey <gbailey at lxpro.com> said: >> Wes didn't say the reason he wanted to zero unused blocks, but I >> always do this in kickstart scripts when constructing VM images as >> the image size is considerably reduced by doing this... > > 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. -- Bob Nichols "NOSPAM" is really part of my email address. Do NOT delete it.