Catalog aliases can be used for configuring WebSphere Application Server for z/OS. This topic covers considerations when working with aliases.
A node uses either LPA/LNKLST or STEPLIB to access the traditional MVS module libraries that are part of the WebSphere Application Server for z/OS product, depending on what you specify in the z/OS Profile Management Tool. If STEPLIB is specified, STEPLIB statements are built in the JCL start procedures and a file called setupCmdLine.sh. When you apply service to a node that is using STEPLIB to access the MVS module libraries, you will need to update your JCL start procedures and setupCmdLine.sh file for the node -- unless you use catalog aliases rather than the actual data set names.
A catalog alias is a reference in the catalog that points to an actual data set. With a catalog alias, your STEPLIB can point to the alias, while the alias points off to the maintenance-specific dataset. When it comes time to switch a node over to a new level of maintenance, you can simply change the alias rather than crawling through STEPLIBs in the JCL start procedures and setupCmdLine.sh shell scripts.
Refer to http://www.ibm.com/support/techdocs/atsmastr.nsf/WebIndex/WP100396, for detailed information on the use of catalog aliases.
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