A SYMNOUT DD statement specifies a data set in which you want DFSORT or ICETOOL to print your original SYMNAMES statements and the symbol table constructed from them. DFSORT or ICETOOL uses RECFM=FBA, LRECL=121 and the specified BLKSIZE for the SYMNOUT data set (SYMNOUT for short).

For best performance, use a large block size, such as the system determined optimum block size, for the SYMNOUT data set.