KVM : Storage Migration2019/07/23 |
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This is the example to use Storage Migration function for virtual machines.
The different point of Storage Migration from Live Migration is that
Storage Migration does not need a Storage server which has virtual machine images, when executing Storage Migration,
virtual machine image on a KVM host is migrated on another KVM host.
Storage Migration
<------------------->
+----------------------+ +----------------------+
| [ KVM Host #1 ] |10.0.0.51 10.0.0.52| [ KVM Host #2 ] |
| +---------------------+ |
| kvm01.srv.world | | kvm02.srv.world |
+----------------------+ +----------------------+
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| [1] |
Configure 2 KVM Host Servers and Create a Virtual Machine on a KVM Host.
2 KVM Host Servers need to be resolv hostname or IP address each other via DNS or local hosts file. |
| [2] | Show the file size of a Virtual Machine image on a KVM host, and move to another KVM Host, then create a empty disk image that is the same size of Virtual Machine. |
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# show the size of Virtual machine root@kvm01:~# ll /var/kvm/images total 7237660 -rw------- 1 root root 21478375424 Jul 22 22:16 debian.img ### on another KVM host ### # create a disk which is the same size of a Virtual Machine root@kvm02:~# qemu-img create -f qcow2 /var/kvm/images/debian.img 21478375424 root@kvm02:~# ll /var/kvm/images total 196 -rw-r--r-- 1 root root 196936 Jul 23 19:18 debian.img |
| [3] | That's OK, execute Storage Migration like follows. |
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root@kvm01:~# virsh list Id Name State ------------------------ 1 debian running
root@kvm01:~#
root@kvm01:~# virsh migrate --live --copy-storage-all debian qemu+ssh://10.0.0.52/system
virsh list Id Name State -------------------- # VM is just migrated
### on another KVM host ### root@kvm02:~# virsh list Id Name State ------------------------ 1 debian running # back to another host, run Live migration with unsafe option root@kvm02:~# virsh migrate --live --unsafe debian qemu+ssh://10.0.0.51/system
virsh list Id Name State -------------------- |
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