4.7. Maintaining optional software (applying updates)

Software that is distributed to fix a problem in a product is called an update. All software products have a version number and a release number that identify the release level of the product. In addition to this, product updates are assigned a modification level number and a fix level number to identify the level of the update. See Section 4.4, “Understanding maintenance levels” on page 82 for information on maintenance levels.

Suppose that you have your system currently running 4.3.2.0, and all the filesets are at 4.3.2.0 maintenance level. IBM has just released a latest maintenance level for systems on 4.3.2.0. You have to upgrade your system to bring it to the latest maintenance level. ...

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