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Root and data disk combinations
- Local root + Local data. This is the primary scenario that needs to be enabled
- Shared root + Local data. This combination will not be blocked explicitly but I cannot think of any use case for this
- Local root + Shared data. This is already supported
- Shared root + Shared data. This is already supported 

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Hack for creating data disk (in existing code)
- Create a VM with local ROOT disk
- Take a snapshot of this
- Create a volume from the snapshot, this is created on the local storage

Appendix B:

Questions
- What happens when a VM with local data disk is deleted? Should the data disk gets cleaned up? In ec2 gets cleaned up. In CS for shared data disk it gets detached
- Detach/attach of local disk. Once attached to an instance should we allow re-attach to another VM instance (ec2 doesn't)?