Retype validation

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When you retype or migrate a volume, the retype validation API ensures that the target templates listed are the most eligible templates for the selected volume.

Note: The migration_policy - generic must be used only when all other options - 'never' and 'on-demand' do not work.

Retype validation options

Table 1. Options for retype validation API
Method	URI	Description
GET	`/v3/<tenant_id>/volumes/<volume_id>/retype-validation`	The retype validation API is called for a volume ID. Fetches a list of viable storage templates.
GET	`v3/<project/tenant_id>/volumes/<volume_id>/retype-validation?generic_migration=true`	Lists all storage templates that are created in PowerVC for the tenant without any validation.

Retype validation API without any option

This API is called for a volume ID and PowerVC fetches a list of viable storage templates as response.

Response codes

Table 2. Response codes for retype validation API
Error code	Error	Reason
400	Invalid input received: Valid parameter values are ['true','false']	Using retype validation with generic_migration option and providing an incorrect value.
400	Invalid volume type. The volume type does not belong to the storage provider for this volume. Use a volume-type that is associated with the volume's storage provider.	Using retype validation for a volume that has volume type assigned with no storage provider assigned.
403	Cannot perform retype for volume `<volume_name>` because it is in `<state>` state. Valid states are available and in-use.	Using retype validation for a volume which is not in available or in-use state.
403	Volume `<volume>` is part of a consistency group `<group>`. Remove the volume from the consistency group and retry.	Using retype validation for a volume, which is part of a group.
403	Volume `<volume_name>` does not have any storage template assigned. Set the template using powervc-config storage set-template	Using retype validation for a volume that has no storage template assigned.
403	Retype is not allowed for the volume `<volume_name>` since it is attached to a virtual machine and is a shared volume.	Using retype validation for a volume in use and multiattach set to True.
403	Retype is not allowed for shared storage pool.	Using retype validation for a volume part of shared storage pool.
403	Retype is not allowed for Hitachi without generic migration filter set as True.	Using retype validation for a volume part of Hitachi storage and not using generic_migration filter.
403	Retype is not allowed for GPFS storage.	Using retype validation for a volume part of GPFS storage.
404	Volume `<volume_id>` could not be found.	Using retype validation for a non-existent volume.
404	Volume type `<volume_type_id>` could not be found.	Using retype validation for a volume having non-existent volume type.

Response body

Table 3. Parameters in the response for retrieving the list of storage templates
Name	Style	Type	Description
`target_templates`	body	list of string	List of viable storage templates.

Example: Retype validation API response

{
  "target_templates": ["SVC Base Template", "DRP pool template", "thin provisioning template", "Compression template"]
}

Example: Retype validation API - with generic_migration option

{
  "target_templates": ["SVC Base Template", "DRP pool template", "thin provisioning template", "Compression template", "Different storage template"]
}