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HP Tru64 UNIX Version 5.1B-2 and Higher: Patch Kit Installation Instructions > Chapter 1 Patch Process Overview

Patch Applicability

 

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Patch applicability to the existing system files is done on a file-by-file basis for each patch. This ensures that the installation of a patch will not degrade or crash the system. The installation of a patch is blocked if any system files to be replaced by a patch are not valid predecessors of the patch files.

Patch applicability also enables consistency checking and reporting for the installation of Tru64 UNIX and TruCluster software patches.

In cases where a patch is blocked, informative messages are provided to assist you in determining how to proceed. Appendix B “Common Error, Warning, and Informational Messages” lists common error messages and suggested corrective actions.

The installation of a patch is blocked if any of the following conditions exist:

  • The underlying software product subset is not installed — for example, if the applicable Tru64 UNIX or TruCluster software release subset is not installed.

  • The setld inventory is inconsistent with the existing system files. This occurs when an operating system or TruCluster software setld subset is installed and individual operating system files that are part of that subset are moved, deleted, or replaced.

  • The patch installation is blocked if any existing system files (files that are targeted to be updated by a patch) have changed and cannot be related to previous versions of the patch. This ensures that operating system files that change due to other explicit system administrator action (for example, layered product patches or non-dupatch installed CSP installations) are not inadvertently overwritten. You must take special action, through the baseline feature to enable patch installation in this situation.

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