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5.5. Upgrading a RHEV-H 3.6 Self-Hosted Engine to a RHVH 4.1 Self-Hosted Engine

To upgrade a Red Hat Enterprise Virtualization 3.6 self-hosted engine environment that contains only Red Hat Enterprise Virtualization Hypervisors (RHEV-H) to Red Hat Virtualization 4.0 and later, you must remove the hosts and upgrade them to Red Hat Virtualization Host (RHVH). Because the host "upgrade" is actually a reinstall, you can skip the 4.0 version of RHVH and reinstall the hosts with RHVH 4.1 directly.
Self-hosted engine nodes in Red Hat Enterprise Virtualization 3.6 are added using the hosted-engine --deploy command, which is not available on RHVH 4.1 for adding more nodes, and self-hosted engine nodes in Red Hat Virtualization 4.1 are added using the UI, which is not available in Red Hat Enterprise Virtualization 3.6. Therefore, to upgrade the environment from 3.6 to 4.1, you must first install a self-hosted engine node running RHVH 4.0, on which the hosted-engine --deploy command is deprecated but still available.

Note

This scenario does not impact self-hosted engine environments that contain some (or only) Red Hat Enterprise Linux self-hosted engine nodes, as they can be updated without being removed from the environment.
Upgrading from a Red Hat Enterprise Virtualization 3.6 self-hosted engine environment with RHEV-H 3.6 hosts to a Red Hat Virtualization 4.1 environment with RHVH 4.1 hosts involves the following key steps:
  • Install a new RHVH 4.0 host and add it to the 3.6 self-hosted engine environment. The new host can be an existing RHEV-H 3.6 host removed from the environment and reinstalled with RHVH 4.0.
  • Upgrade the Manager from 3.6 to 4.0.
  • Remove the rest of the RHEV-H 3.6 hosts and reinstall them with RHVH 4.1.
  • Add the RHVH 4.1 hosts to the 4.0 environment.
  • Upgrade the Manager from 4.0 to 4.1.
  • Update the remaining RHVH 4.0 host to RHVH 4.1.
Alternatively, you can install a 3.6 version of RHVH in the 3.6 environment and perform a standard stepped upgrade from 3.6 to 4.0, and 4.0 to 4.1. See Red Hat Virtualization Hosts in the Red Hat Enterprise Virtualization 3.6 Self-Hosted Engine Guide for more information.

Procedure 5.5. Upgrading a RHEV-H 3.6 Self-Hosted Engine to a RHVH 4.1 Self-Hosted Engine

  1. If you are removing a RHEV-H 3.6 host from the environment to reinstall with RHVH 4.0, see Section 5.2, “Removing a Host from a Self-Hosted Engine Environment”.
  2. Upgrade the environment from 3.6 to 4.0 using the instructions in Upgrading a RHEV-H-Based Self-Hosted Engine Environment in the Red Hat Virtualization 4.0 Self-Hosted Engine Guide.
  3. Upgrade each RHEV-H 3.6 host directly to RHVH 4.1:
    1. Remove the host from the self-hosted engine environment. See Section 5.2, “Removing a Host from a Self-Hosted Engine Environment”.
    2. Reinstall the host with RHVH 4.1. See Installing Red Hat Virtualization Host in the Installation Guide.
    3. Add the host to the 4.0 environment. See Installing Additional Hosts to a Self-Hosted Environment in the Red Hat Virtualization 4.0 Self-Hosted Engine Guide.
  4. Upgrade the Manager and the remaining RHVH 4.0 host to 4.1 using the instructions in Section 5.3, “Upgrading a Self-Hosted Engine Environment”.
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