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---
upgrade:
- |
After running the migration script to migrate CGs to
generic volume groups, CG and group APIs work as follows.
* Create CG only creates in the groups table.
* Modify CG modifies in the CG table if the CG is in the
CG table, otherwise it modifies in the groups table.
* Delete CG deletes from the CG or the groups table
depending on where the CG is.
* List CG checks both CG and groups tables.
* List CG Snapshots checks both the CG and the groups
tables.
* Show CG checks both tables.
* Show CG Snapshot checks both tables.
* Create CG Snapshot creates either in the CG or the groups
table depending on where the CG is.
* Create CG from Source creates in either the CG or the
groups table depending on the source.
* Create Volume adds the volume either to the CG or the
group.
* default_cgsnapshot_type is reserved for migrating CGs.
* Group APIs will only write/read in/from the groups table.
* Group APIs will not work on groups with default_cgsnapshot_type.
* Groups with default_cgsnapshot_type can only be operated by
CG APIs.
* After CG tables are removed, we will allow default_cgsnapshot_type
to be used by group APIs.
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