openstack 熱遷移內存不足的解決辦法

熱遷移的時候提示WARNING nova.scheduler.utils [req-06dd66cf-7e67-491f-b84d-68699e87a026 bd43cf861cdc4fc7ac03bf104343968c 2150480345904b378d389571a75bdc1c] Failed to compute_task_migrate_server: Migration pre-c

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