Follow the naming convention used at your installation. For example, for the /tmp file system, you could use one of these:
OMVS.TMPAs you can see in this example, a data set name can consist of segments, called "qualifiers", that are separated by periods. In this example, OMVS is the high-level qualifier.
Each data set name qualifier, including the high-level qualifier, is 1 to 8 characters. Including all name segments and periods, the length of the data set name must not exceed 44 characters. Thus, a maximum of 22 name segments can make up a data set name.
If you use a symbolic name as part of the data set name, you need to allocate that data set for the target system when your msys customization is completed.