9 Feb
2016
9 Feb
'16
5:01 a.m.
On 02/08/2016 07:04 PM, Chris Adams wrote:
Once upon a time, Greg Bailey gbailey@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.
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