Support volume_type with BDM Parameter

Registered by John Haan

Currently when creating a new instance with boot from volume, user only can choose volume_size.
the volume to be attached as a root isthe volume type defined in default_volume_type of cinder configuration in multi backed environments. In other words, the user cannot select the root volume type as the desired volume type.

There were some blueprints related this feature, however not developed yet.
https://blueprints.launchpad.net/nova/+spec/add-volume-type-in-blockdeviceconfig
https://blueprints.launchpad.net/nova/+spec/add-volume-type-when-boot-instances

This feature is very necessary in a multi backend volume environment.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
John Haan
Direction:
Needs approval
Assignee:
None
Definition:
New
Series goal:
Proposed for queens
Implementation:
Unknown
Milestone target:
None

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