Feature Overview (aka. Goal Summary)  

Allow Datacenter customers to leverage existing SAN infrastructure with OCP Virt with dynamic provisioning and live migration.  

Goals (aka. expected user outcomes)

As Data Center OCP admin, I can add my existing expensive SAN infrastructure to OCP nodes to host VM workloads, so that I can better migration VMs from vSphere to OCP Virt.

The goal of Dev Preview release is to to provide MVP functions with limited docs, to get early feedback from customers. 

Requirements (aka. Acceptance Criteria):

General: 

• Allow Datacenter customers to leverage existing SAN infrastructure with OCP Virt
• Support multiple VMs (virtual disks) out of a single LUN with dynamic provisioning for end-user self service with high level of isolation 
• Support live migration of VMs (--> RWX)

MVP Scope:

• 1 LUN per VG
• many VMs per VG
• VM can have multiple PV, but they must all be on the same VG (== StorageClass)
• No multi-path
• LiveMigration of a single VM from one node to another (RWX)
• Snapshots/Cloning/ReSizing (CSI conformity >=V1.5)
• Integration of kubesan as additional backend parallel to topolvm into LVMs

Questions to Answer (Optional):

1. HW for CI testing - AWS? ReUse from RHV team?

Out of Scope

• Full fledge CI, DevPreview has minimum CI testing
• multi-path SAN (–> TechPreview scope)
• Thin pool only (Thick pool maybe later)
• other kubesan backends then SAN-LUN  (NFS, etc)

Background

See Integrate KubeSAN into LVMS to unblock OCP Virt SAN customers 

Customer Considerations

See Integrate KubeSAN into LVMS to unblock OCP Virt SAN customers 

Documentation Considerations

1. Docs needs to be added to the existing LVMS docs which might need a refactoring to allow for the two different backend types (LVM and SAN).  
2. Constraints and Limitations / OutOfScope needs to be clearly documented

Interoperability Considerations

1. OCP Virt
2. Hosted Control Plane