![]() Sparse disk images can be implemented using sparse files on the host, or you can use a format like qcow2 which inherently supports sparse files. A sparse virtual disk image is the same sort of thing: blocks that the guest hasn’t written to yet are not stored by the host, and read as all zeroes. ![]() Update: libguestfs ≥ 1.14 includes a new tool called virt-sparsify which can make guests sparse (thin-provisioned).Ī sparse file is one where file blocks that would contain all zeroes are omitted from the file (and don’t take up any space in the filesystem).
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