KVM : Storage Migration |
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. |
| [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/debian13.img image: /var/kvm/images/debian13.img
file format: qcow2
virtual size: 20 GiB (21474836480 bytes)
disk size: 5 GiB
cluster_size: 65536
Format specific information:
compat: 1.1
compression type: zlib
lazy refcounts: true
refcount bits: 16
corrupt: false
extended l2: false
Child node '/file':
filename: /var/kvm/images/debian13.img
protocol type: file
file length: 20 GiB (21478375424 bytes)
disk size: 5 GiB
### 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/debian13.img 21474836480 |
| [3] | That's OK, Run Storage Migration like follows. |
| root@kvm01:~# virsh list Id Name State -------------------------- 1 debian13 running root@kvm01:~# root@kvm01:~# virsh migrate --live --copy-storage-all debian13 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 debian13 running |
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