Allow migrating PMEM's data

Registered by Qiu Fossen

As a user, i want to copy the data of pmem devices for instance when cold migrating or resizing the instance.
Currently, cold migrate or resize instance could make the PMEM Namespaces different on host, which is a PMEM Device for the instance. But the instance's data in the PMEM Device will lose. So i want to copy the data of pmem devices for instance when cold migrating or resizing the instance.

As following:
1.The instance use /dev/dax0.0 PMEM Namespace on host.
2.After cold migrate or resize instance, the PMEM Namespace is /dev/dax0.1 on host or other host.
3.Copy the data from /dev/dax0.0 to /dev/dax0.1 .

Blueprint information

Status:
Not started
Approver:
Balazs Gibizer
Priority:
Undefined
Drafter:
Qiu Fossen
Direction:
Approved
Assignee:
Qiu Fossen
Definition:
Approved
Series goal:
Accepted for xena
Implementation:
Not started
Milestone target:
milestone icon xena-3

Related branches

Sprints

Whiteboard

SPEC https://review.opendev.org/c/openstack/nova-specs/+/785563

[20210526 gibi]: spec has been merged so bp is approved for Xena.

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