CentOS 6
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Storage Migration
2014/08/06
 
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 whivh 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]
Create a virtual machine on a KVM host.
[2] Show the file size of a virtual machine image like follows on a KVM host and move to another KVM host, create a empty disk space like follows.
# show the size of Virtual machine

[root@kvm01 ~]#
ll /var/kvm/images

total 846468
-rwxr-xr-x 1 root root 32212254720 Aug  6 22:00 centos.img


### on another KVM host ###

# create a disk space which is the same size of a virtula machine

[root@kvm02 ~]#
fallocate -l 32212254720 /var/kvm/images/centos.img

[root@kvm02 ~]#
ll /var/kvm/images

total 31457284
-rw-r--r-- 1 root root 32212254720 Aug  6 22:10 centos.img
[3] It's OK all, execute Storage Migration like follows.
[root@kvm01 ~]#
virsh list

 Id    Name             State
--------------------------------------
 2     centos           running

[root@kvm01 ~]#
virsh migrate --live --copy-storage-all centos qemu+ssh://10.0.0.22/system

root@10.0.0.22's password:
[root@kvm01 ~]#
virsh list

 Id    Name             State
--------------------------------------
 
# just migrated
### on another KVM host ###

[root@kvm02 ~]#
virsh list

 Id    Name              State
---------------------------------------
 1     centos            running

# back to another host, it's OK to execute normal Live Migration

[root@kvm02 ~]#
virsh migrate --live centos qemu+ssh://10.0.0.21/system

root@10.0.0.21's password:
[root@kvm02 ~]#
virsh list

 Id    Name             State
--------------------------------------

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