Difference between revisions of "Qemu-img create"
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* <code>qemu-img create -f [[qcow2]] MY_IMAGE_NAME.[[qcow2]] 10G</code> | * <code>qemu-img create -f [[qcow2]] MY_IMAGE_NAME.[[qcow2]] 10G</code> | ||
* <code>qemu-img create -f raw MY_IMAGE_NAME.img</code> | * <code>qemu-img create -f raw MY_IMAGE_NAME.img</code> | ||
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* <code>qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img</code> | * <code>qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img</code> | ||
:::<code>lazy_refcounts=on</code> Reference count updates are postponed with the goal of avoiding metadata I/O and improving performance. Particularly interesting with cache=writethrough. | :::<code>lazy_refcounts=on</code> Reference count updates are postponed with the goal of avoiding metadata I/O and improving performance. Particularly interesting with cache=writethrough. | ||
Revision as of 07:52, 5 August 2020
qemu-img create -f qcow2 -o preallocation=metadata,compat=1.1,lazy_refcounts=on MY_IMAGE_NAME.img
lazy_refcounts=onReference count updates are postponed with the goal of avoiding metadata I/O and improving performance. Particularly interesting with cache=writethrough.
qemu-img create -f qcow2 MY_IMAGE_NAME.img 10G
qemu-img create -f qcow2 MY_IMAGE_NAME.qcow2 20G Formatting 'MY_IMAGE_NAME.qcow2', fmt=qcow2 size=21474836480 cluster_size=65536 lazy_refcounts=off refcount_bits=16
qemu-img create -f qcow2 MY_IMAGE_NAME.img qemu-img: MY_IMAGE_NAME.img: Image creation needs a size parameter
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