Hello, Here is the situation: nova has live-migration feature but doesn't have ci job to cover it by functional tests, only gate-tempest-dsvm-multinode-full(non-voting, btw), which covers block-migration only. The problem here is, that live-migration could be different, depending on how instance was booted(volume-backed/ephemeral), how environment is configured(is shared instance directory(NFS, for example), or RBD used to store ephemeral disk), or for example user don't have that and is going to use --block-migrate flag. To claim that we have reliable live-migration in nova, we should check it at least on envs with rbd or nfs as more popular than envs without shared storages at all. Here is the steps for that:
1. make gate-tempest-dsvm-multinode-full voting, as it looks OK for block-migration testing purposes; 2. contribute to tempest to cover volume-backed instances live-migration; 3. make another job with rbd for storing ephemerals, it also requires changing tempest config; 4. make job with nfs for ephemerals. These steps should help us to improve current situation with live-migration. -- Timofey.
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