Feature Overview (aka. Goal Summary)

Currently the maximum number of snapshots per volume in vSphere CSI is set to 3 and cannot be configured. Customers find this default limit too low and are asking us to make this setting configurable.

Maximum number of snapshot is 32 per volume

Goals (aka. expected user outcomes)

Customers can override the default (three) value and set it to a custom value.

Make sure we document (or link) the VMWare recommendations in terms of performances.

https://docs.vmware.com/en/VMware-vSphere-Container-Storage-Plug-in/3.0/vmware-vsphere-csp-getting-started/GUID-E0B41C69-7EEB-450F-A73D-5FD2FF39E891.html#GUID-7BA0CDAE-E031-470E-A685-60C82DAE36D2__GUID-D9A97A90-2777-46EA-94EB-F04A27FBB76D

https://kb.vmware.com/s/article/1025279

Requirements (aka. Acceptance Criteria):

The setting can be easily configurable by the OCP admin and the configuration is automatically updated. Test that the setting is indeed applied and the maximum number of snapshots per volume is indeed changed.

No change in the default

Use Cases (Optional):

As an OCP admin I would like to change the maximum number of snapshots per volumes.

Out of Scope

Anything outside of 

https://docs.vmware.com/en/VMware-vSphere-Container-Storage-Plug-in/3.0/vmware-vsphere-csp-getting-started/GUID-E0B41C69-7EEB-450F-A73D-5FD2FF39E891.html#GUID-7BA0CDAE-E031-470E-A685-60C82DAE36D2__GUID-D9A97A90-2777-46EA-94EB-F04A27FBB76D

Background

The default value can't be overwritten, reconciliation prevents it.

Customer Considerations

Make sure the customers understand the impact of increasing the number of snapshots per volume.

https://kb.vmware.com/s/article/1025279

Documentation Considerations

Document how to change the value as well as a link to the best practice. Mention that there is a 32 hard limit. Document other limitations if any.

Interoperability Considerations

N/A