[NOVA][CEPH] Block migration can not be used with shared storage.

[Leontii Istomin]

api: '1.0'
astute_sha: 3f1ece0318e5e93eaf48802fefabf512ca1dce40
auth_required: true
build_id: 2015-03-26_21-32-43
build_number: '233'
feature_groups:
- mirantis
fuellib_sha: 9c7716bc2ce6075065d7d9dcf96f4c94662c0b56
fuelmain_sha: 320b5f46fc1b2798f9e86ed7df51d3bda1686c10
nailgun_sha: b163f6fc77d6639aaffd9dd992e1ad96951c3bbf
ostf_sha: a4cf5f218c6aea98105b10c97a4aed8115c15867
production: docker
python-fuelclient_sha: e5e8389d8d481561a4d7107a99daae07c6ec5177
release: '6.1'

successfully deployed the following configuration:
Baremetal,Ubuntu,IBP,HA, Neutron-vlan,Ceph-all,Nova-debug,Nova-quotas,6.1-233
Controllers:3 Computes:47

during rally tests we have found the following error during "boot_server_from_volume_and_live_migrate" scenario:
node-5.domain.tld is not on local storage: Block migration can not be used with shared storage. (HTTP 400)
from nova-api log: http://paste.openstack.org/show/212647/

Probably we need to change logic of libvirt driver (nova/virt/libvirt/driver.py) to always return True in _check_shared_storage_test_file.
You can read more here https://blog.codecentric.de/en/2015/03/true-kvm-live-migration-openstack-icehouse-ceph-based-vm-storage/

Diagnostic Snapshot: http://mos-scale-share.mirantis.com/fuel-snapshot-2015-04-29_20-32-07.tar.xz

[Sergey Nikitin (snikitin)]

As I see you used Ceph. Ceph is a shared storage. And when you tried to migrate a server you got "Block migration can not be used with shared storage". So I think this is a normal reaction.

[Timofey Durakov (tdurakov)]

That's correct that nova doesn't allow block migrate, when there are shared storage.

[Andriy Kurilin (andreykurilin)]

Rally scenarios were updated to disable block_migration.