KVM OpenStack Error: /Stage[main]/Nova::Db::Sync/Exec[nova-db-sync]

Packstack Error: Command exceeded timeout
Few times during KVM based OpenStack (Mitaka, Newton) automated installations using packstack we encountered DB synchronization errors.

It turned out, that these installation errors appeared due to slow network and/or poor hardware performance of KVM virtualized hardware used to build OpenStack virtual nodes (Controller, Network, Compute).
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