Support snapshotting all attached volumes in addition to the instance

Registered by Jon Bernard on 2013-12-10

There are currently three ways in Nova to create a snapshot of one, some, or all of the volumes attached to a particular instance. But none of these options allow a user to create volume snapshots after I/O is quiesced as a single transaction. This proposal explains how this missing feature could be implemented, thus substantially improving the snapshotting capabilities of Nova.

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
None
Direction:
Needs approval
Assignee:
Jon Bernard
Definition:
Drafting
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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Removed from next, as next is now reserved for near misses from the last milestone --johnthetubaguyRemoved from next, as next is now reserved for near misses from the last milestone --johnthetubaguy

Marking this blueprint as definition: Drafting. If you are still working on this, please re-submit via nova-specs. If not, please mark as obsolete, and add a quick comment to describe why. --johnthetubaguy (20th April 2014)Removed from next, as next is now reserved for near misses from the last milestone --johnthetubaguyRemoved from next, as next is now reserved for near misses from the last milestone --johnthetubaguy

Marking this blueprint as definition: Drafting. If you are still working on this, please re-submit via nova-specs. If not, please mark as obsolete, and add a quick comment to describe why. --johnthetubaguy (20th April 2014)

Marking this blueprint as definition: Drafting. If you are still working on this, please re-submit via nova-specs. If not, please mark as obsolete, and add a quick comment to describe why. --johnthetubaguy (20th April 2014)

Several comments regarding the blueprint, but it would be really better if it were in the nova-specs git so we could comment there. Commenting only because submitted as a Summit proposal:
  * os-assisted-snapshot is really an admin only API that is meant to be used by Cinder when snapshotting GlusterFS backed volumes.
  * IIUC the quiesce really works with libvirt only when using a guest agent which is very specific to a deployment implementation and we need to be careful about exposing it in the API. --ndipanov (23rd April 2014)

Gerrit topic: https://review.openstack.org/#q,topic:instance-level-snapshots,n,z

Addressed by: https://review.openstack.org/101295
    Initial step towards instance-level snapshots

(?)

Work Items

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