For a lot of reasons, it may be convenient to detach or attach live disks to a running VM without having to reboot it. Sure, you can use some network based storage, but when performance counts, attaching a new virtual disk will usually give you better throughput and lower latency in a quick testing situation.
drive_add 0 if=virtio,file=/tmp/vm.qcow2,if=virtio,format=qcow2,id=rtt
Can't hot-add drive to type 7
We achieve this by setting if=none so it has no physical interface but we make QEMU aware that the virtual disk does exist.
drive_add 0 if=virtio,file=/tmp/vm.qcow2,if=none,format=qcow2,id=rtt
There should be no output which means it is all good now!
Congrats, you've now hotadded a virtual drive to QEMU without having to restart
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