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migration - host key verification failed

Hi All,

I am completed my private setup with 3 nodes controller,nova& neutron with + centos 7 i am able to create my instance and running perfect my kvm host uses internal storage, now i added second host kvm with local storage to my existing setup, now i try to migrate vm to newly added host when i click migrate on ui interface got the below error

Error: Failed to launch instance "lb1-ceca74d8-a9b6-44c9-a9b0-401208890afc": Please try again later [Error: Unexpected error while running command. Command: ssh mkdir -p /var/lib/nova/instances/ceca74d8-a9b6-44c9-a9b0-401208890afc Exit code: 255 Stdout: u'' Stderr: u'Host key verification failed.\r\n'].

My doubt is openstack support to migrate vm when uses local storage ? if not what kind of storage i need to use.... need suggestions... thanks in advance....

Regards, Prapul