Create & modify Qemu and Raw disk images:
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To create images:

This example creates a qcow2 image with a maximum size of 8GB:
qemu-img create -f qcow2 disk1.qcow2 8G

This example creates a RAW image with a maximum size of 8GB:
qemu-img create -f raw disk1.img 8G

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To view Image properties:

This example displays attributes of a qcow2 image:
qemu-img info disk1.qcow2

This example displays attributes of a RAW image:
qemu-img info disk1.img

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To increase virtual disk size:

This example increases the size of a qcow2 image:
qemu-img resize disk1.qcow2 16G

This example increases the size of a RAW image
qemu-img resize -f raw disk1.img 16G


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Source: https://www.ibm.com/docs/en/linux-on-systems?topic=commands-examples-use-qemu-img-command
Date: June 5th 2021