You can specify whether object names in the user-defined file system (UDFS) will be case-sensitive or case-insensitive when you create it.
When you select case-sensitivity, uppercase and lowercase characters are distinguished when searching for object names. For example, a name that is supplied in all uppercase characters will not match the same name in which any of the characters are lowercase. Therefore, /home/MURPH/ and /home/murph/ are recognized as different directories. To create a case-sensitive UDFS, you can specify *MIXED for the CASE parameter when using the Create User-Defined File System (CRTUDFS) command.
When you select case-insensitivity, the server does not distinguish between uppercase and lowercase characters during searches for names. Therefore, the server would recognize /home/CAYCE and /HOME/cayce as the same directory, not as two separate directories. To create a case-insensitive UDFS, you can specify *MONO for the CASE parameter when using the CRTUDFS command.
In either case, the file system saves the same uppercase and lowercase forms in which the user enters object names. The case-sensitivity option only applies to how the user searches for names through the server.