Qemu-img

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qemu-img[1] allows you to create, convert and modify images offline, It can handle all image formats supported by QEMU.


  • qemu-img create
    • qemu-img create -f qcow2 MY_IMAGE_NAME.img 3G
    • qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img
lazy_refcounts=on Reference count updates are postponed with the goal of avoiding metadata I/O and improving performance. Particularly interesting with cache=writethrough.
  • Create a snapshot: qemu-img create -f qcow2 -o backing_file=original snapshot.qcow[3]
  • qemu-img snapshot (See also: lvcreate --snapshot for LVM snapshots)


Activities

See also

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Source: wikiversity

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