FILEMODE specifies whether DB2, SdU, and STL files created by using OPEN OUTPUT statements will have large-format or small-format metadata (internal control information), which affects their maximum size.
Default is: FILEMODE(LARGE)
Abbreviation is: FM(L|S)
You can process large-format and small-format files with either 32-bit or 64-bit COBOL for AIX programs. File processing is not sensitive to the value of the ADDR compiler option.
FILEMODE does not affect the processing of line-sequential, Encina SFS, or RSD files. These files do not have a maximum COBOL size limit.
related references
DB2 file system
SdU file system
STL file system
File-system summary
ADDR
STL and SdU files that are larger than 2 GB
Compiler limits (COBOL for AIX Language Reference)