Open Stack

hello
I use OpenStack and I create some VMs in different compute in one region.
when I resize the VM. if the compute doesn't have enough space,
automatically the vm will be migrated to another compute. but my problem is
here that when it migrated, the _base file doesn't migrate and remains in
the first compute that it doesn't have enough space. because of this, the
VM appears with an error status in OpenStack. if I move the _base from
first compute to final compute and reboot the server this problem has been
solved.
so i need to not transfer _base manually and if it migrated to another
compute the disk and _base transfer with each other.
could you please help me to solve this problem?
thanks in advance
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