Problem with live migration

Respected Sir,

I have RHEVM manager version 3.1.4

and 2 RHEV-H Host 6.4

1) first rhev-h node name "vm1"

2) second rhev-h node name "vm2"

both the rhev-h host are in the single cluster

Now i have create 1 vm on "vm1 rhev-h node"

and try to manuall  migratie to the second node "vm2" it working fine

now for testing i have disconnected the network from my one of the rhev-h host "vm2" on which the vm is running

so on the manager it shows that  rhev-h host vm2 is down

but the problem is the vm which is running on vm2 node is not migrating automatically

do i required any special configuration for that

i have also keep that vm on high availabilty also

still it is not migrating automatically

Please give the solution for that

Regards