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XFS/EXT4: Why is actual file size on disk larger than apparent size? Clarification

On a CentOS 7.1.1503 (3.10.0-229.el7.x86_64) system running KVM/qemu on an XFS filesystem, I'm attempting to work out what specifically is adding additional space to a VM diskimage file. $ ls -ls ...
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Reduce xen image disk usage

Two cases: 1.If making hdd image using dd and copy it trough nfs to another server: mount -o ro,remount / dd if=/dev/sda bs=64K | gzip -c > /share/test.img.gz then after gunzip I get 20Gb (for ...