Every file created in Oracle ASM gets a system-generated file name, otherwise known as a fully qualified file name. This is similar to a complete path name in a local file system.
Oracle ASM generates file names according to the following scheme:
+diskGroupName/databaseName/fileType/fileTypeTag.fileNumber.incarnation
An example of a fully qualified file name is the following:
+data/orcl/CONTROLFILE/Current.256.541956473
In the previous fully qualified file name, data is the disk group name, orcl is the database name, CONTROLFILE is the file type, and so on.
Only the slash (/) is supported by ASMCMD. File Names are not case sensitive, but are case retentive. If you type a path name as lowercase, ASMCMD retains the lowercase.
For more information about Oracle ASM file names, refer to "Fully Qualified File Name Form".