KVM : Storage Migration2023/06/20 |
This is the example to use Storage Migration feature for Virtual Machines.
The different point of Storage Migration from the Common Live Migration is that
Storage Migration does not need a Storage server that has Virtual Machine images,
when executing Storage Migration, Virtual Machine image on a KVM host is migrated on another KVM host like follows.
Storage Migration <-------------------> +----------------------+ +----------------------+ | [ KVM Host #1 ] |10.0.0.21 10.0.0.22| [ KVM Host #2 ] | | +---------------------+ | | kvm01.srv.world | | kvm02.srv.world | +----------------------+ +----------------------+ |
[1] |
Configure 2 KVM Host Server and Create a Virtual Machine on a KVM Host.
Configure DNS or hosts to resolve names or IP addresses normally, first. |
[2] | Confirm the file size of a Virtual Machine image like follows on a KVM host, and next, move to another KVM host to create an empty disk image like follows. |
# show the size of Virtual machine root@kvm01:~# qemu-img info /var/kvm/images/debian12.img image: /var/kvm/images/debian12.img file format: qcow2 virtual size: 20 GiB (21474836480 bytes) disk size: 6.37 GiB cluster_size: 65536 Format specific information: compat: 1.1 compression type: zlib lazy refcounts: true refcount bits: 16 corrupt: false extended l2: false ### on another KVM host ### # create a disk which is the same size of a Virtual Machine root@kvm02:~# qemu-img create -f qcow2 -o preallocation=falloc /var/kvm/images/debian12.img 21474836480 |
[3] | That's OK, Run Storage Migration like follows. |
root@kvm01:~# virsh list Id Name State -------------------------- 1 debian12 running
root@kvm01:~#
root@kvm01:~# virsh migrate --live --copy-storage-all debian12 qemu+ssh://10.0.0.22/system virsh list Id Name State -------------------------- # VM migrated
### on another KVM host ### root@kvm02:~# virsh list Id Name State -------------------------- 1 debian12 running |
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