Feature Overview (aka. Goal Summary)  

K8s 1.31 introduces VolumeAttributesClass as beta (code in external provisioner). We should make it available to customers as tech preview.

VolumeAttributesClass allows PVC to be modified after their creation and while attached. There is as vast number of parameters that can be updated but the most popular is to change the QoS values. Parameters that can be changed depend on the driver.

Goals (aka. expected user outcomes)

Productise VolumeAttributesClass as TP in anticipation for GA. Customer can start testing VolumeAttributesClass.

Requirements (aka. Acceptance Criteria):

• Disabled by default
• put it under TechPreviewNoUpgrade
• make sure VolumeAttributeClass object is available in beta APIs
• enable the feature in external-provisioner and external-resizer at least in AWS EBS CSI driver, check the other drivers.
  • Add RBAC rules for these objects
• make sure we run its tests in one of TechPreviewNoUpgrade CI jobs (with hostpath CSI driver)
• reuse / add a job with AWS EBS CSI driver + tech preview.

Anyone reviewing this Feature needs to know which deployment configurations that the Feature will apply to (or not) once it's been completed.  Describe specific needs (or indicate N/A) for each of the following deployment scenarios. For specific configurations that are out-of-scope for a given release, ensure you provide the OCPSTRAT (for the future to be supported configuration) as well.

Use Cases (Optional):

As an OCP user, I want to change parameters of my existing PVC such as the QoS attributes.

Questions to Answer (Optional):

Get list of drivers that supports it (from the ones we ship)

Out of Scope

No UI for TP

Background

There's been some limitations and complains on the fact that PVC attributes are sealed after their creation avoiding customers to update them. This is particularly impacting for a specific QoS is set and the volume requirements are changing.

Customer Considerations

Customer should not use it in production atm. The driver used by customers must support this feature. 

Documentation Considerations

Document VolumeAttributesClass creation and how to update PVC. Mention any limitation. Mention it's tech preview no upgrade. Add drivers support if needed.

Interoperability Considerations

Check which drivers support it for which parameters.