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1. How to distribute the reconciiation tasks if there are multiple management servers ?
   1. now: Reconciliation is processed by first management server
2. How to better handle the state DANGLED_IN_BACKEND ?
   1. now: no special action
3. How to better handle the state COMPLETED and FAILED ? Do not reconcile via hosts if state_by_agent to COMPLETED ?
   1. now: no special action

4. Test cases

4.1 Backend commands of

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VM and volume migrations

Please note: 

Migration between NFS and Local requires the fix: https://github.com/apache/cloudstack/pull/10266

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