KVM : Storage Migration2022/04/28 |
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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 |
+----------------------+ +----------------------+
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| [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. |
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# show the size of Virtual machine root@kvm01:~# qemu-img info /var/kvm/images/ubuntu2204.img
image: /var/kvm/images/ubuntu2204.img
file format: qcow2
virtual size: 20 GiB (21474836480 bytes)
disk size: 8.01 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/ubuntu2204.img 21474836480 |
| [3] | That's OK, Run Storage Migration like follows. |
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root@kvm01:~# virsh list Id Name State ---------------------------- 1 ubuntu2204 running
root@kvm01:~#
root@kvm01:~# virsh migrate --live --copy-storage-all ubuntu2204 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 ubuntu2204 running |
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