This chapter of the Solaris 9 Maintenance Update 4 Installation Guide explains what the Solaris 9 MU4 is and when it is appropriate to install the Maintenance Update.
The separate patch collections provided in conjunction with the Solaris Update Releases, the Solaris Maintenance Updates (MUs), might not be made available at future releases.
The Solaris 9 MU4 contains almost the same set of patches as the patches prepackaged on the Solaris 9 8/03 Software CDs. The MU4 installation automatically updates your system without regressing any patches that you have previously installed.
The Solaris 9 8/03 Software CDs contain a number of additional patches which are required to build the Solaris 9 8/03 image and therefore are not included in the Solaris 9 MU4. For more information, see Identifying the Version of Your Solaris 9 Maintenance Update.
The Solaris 9 MU4 is available as a file for downloading from the Web.
First, your system must be running the Solaris 9 operating environment.
You can then install the Solaris 9 MU4, if you meet both of the following conditions:
You are applying patches that were released in the Solaris 9 8/03 operating environment.
You are retaining patches that you previously applied to your system.
If your system is running the Solaris 9 operating environment, or a Solaris 9 Update release, and you want to fully upgrade to new features and hardware support, install the Solaris 9 8/03 operating environment. The patches that were applied by installing the Solaris 9 8/03 operating environment replace previously installed Solaris 9 patches. The newly installed patches cannot be backed out of the release.
Maintenance Updates are primarily designed to update the Solaris operating environment to a known, tested patch level. If you want to apply a particular patch, and only that patch, do so through your normal support channels.
The name of this product is Solaris 9 MU4. Code or package path names might use Solaris 2.9 or SunOSTM 5.9. Always follow the code or path as it is written in this document.