My Oracle Support Banner

OpenVMS: Oracle Release Multi-Home CRS/RAC Installation on hp Itanium and Alpha Clusters (Doc ID 559915.1)

Last updated on APRIL 14, 2022

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 10.2]
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
HP OpenVMS Itanium
HP OpenVMS Alpha


This document presents a step by step guide for doing a Multi-Home CRS and RAC installation of Oracle Release on an hp OpenVMS cluster.

A standard CRS/RAC installation on OpenVMS results in all RAC nodes sharing the same CRS and RAC code trees.

A Multi-Home install offers the flexibility to have multiple copies of the Oracle CRS and RAC code installed.

Therefore, using this approach, a RAC cluster can be split into a number of logical groups of nodes where each group contains one or more physical nodes.

Then, the CRS and RAC code is installed once per logical group of nodes.

The net result being that a given database will be managed by multiple Oracle code trees across the RAC cluster.

This can reduce down time when applying Oracle patches (e.g Patchsets, CPU or one-off patches) as each logical group of nodes can be patched in isolation from the rest of the active RAC cluster.

The only down time required is during the period when SQL scripts related to any of the patches are executed against the database(s).

Similarly, if each logical group of nodes have their own OpenVMS System disk, then this can also reduce the down time required when upgrading or maintaining the OpenVMS Operating System.

Please note that all nodes within a Multi-Home Oracle CRS/RAC install must be running compatible versions of OpenVMS.

In other words, the OpenVMS versions in use must be classed as supported by HP in a cluster configuration. We do not support OpenVMS versions that are only considered for migration purposes - these can lead to problems with CRS.


This document is not intended to provide generic CRS or RAC information.

If you are unfamiliar with CRS (Clusterware) and RAC, please consult the generic Real Application Clusters documentation:

      OracleR Database Oracle Clusterware and Oracle Real Application Clusters
      Administration and Deployment Guide
      10g Release 2 (10.2)
      Part Number B14197-03

This is available at:

The hp OpenVMS specific 10.2 documentation can be found in the following documents.

   Installation Guide for hp OpenVMS 10.2 (Chapters 5, 6 and Appendix C):

   In the Administrator Reference for hp OpenVMS 10.2 (Appendix G):

It is beyond the scope of this document to detail the steps required for configuring the Network for the various IP addresses that CRS and RAC rely on (e.g Public, Private and Virtual).

Therefore, an assumption is made that this work has been completed correctly prior to the start of the Oracle installation.


To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.