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add a section on upgrade downgrade

This commit is contained in:
Mayank Kumar 2018-03-27 23:39:46 -07:00
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contributors/design-proposals/storage/pv-to-rbd-mapping.md
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@ -69,6 +69,18 @@ and hence can accommodate any pvc names and namespaces which are stored as arbit
It also leaves room for storing any other metadata about the PVC.
### Upgrade/Downgrade Behavior
#### Upgrading from a K8s version without this metadata to a version with this metadata
The metadata for image is populated on CreateImage. After an upgrade, existing RBD Images will not have that
metadata set. When the next AttachDisk happens, we can check if the metadata is not set, set it. Cluster
administrators could also run a one time script to set this manually. For all newly created RBD images,
the rbd image metadata will be set properly.
#### Downgrade from a K8s version with this metadata to a version without this metadata
After a downgrade, all existing RBD images will have the metadata set. New RBD images created after the
downgrade will not have this metadata.
## Proposal 1
Make the RBD Image name as base64 encoded PVC name(namespace+name)