Migrating z/VM to Red Hat OpenShift Virtualization

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This guide covers the process of migrating a z/VM guest with FCP multipath storage to OpenShift Virtualization on s390x architecture.

Overview

The migration process includes the following key steps:

  • Safely detaching FCP disk from z/VM guest
  • Attaching disk to management server
  • Creating DD images from multipath devices
  • Converting to QCOW2 format
  • Modifying boot configuration for KVM
  • Creating bootable VMs in OpenShift Virtualization

Architecture

The migration architecture consists of the following components:

Source
z/VM guest with FCP disk
Target
OpenShift Virtualization VM on s390x
Disk layout
Two partitions (/boot and /) or one partition layout

Migration phases

The migration process is divided into the following phases:

  1. Preparation - Detach disk from z/VM guest
  2. Image creation - Create DD image from z/VM disk
  3. Format conversion - Convert to QCOW2 format
  4. Upload - Upload to OpenShift Virtualization
  5. Boot configuration - Modify boot configuration
  6. Deployment - Deploy VM
  7. Post-migration - Optional post-migration tasks