SYS1.VTAMLIB

SYS1.VTAMLIB is the z/OS® Communications Server load module library, which consists of files containing the user tables, exit routines, and replaceable constants. It is a required partitioned data set.

SYS1.VTAMLIB is used to store these user tables:
  • Class of service (COS) table
  • Communication network management (CNM) routing table
    Restriction: SYS1.LPALIB can no longer be used to store the CNM routing table.
  • Interpret table containing logon descriptions and any installation-coded logon routines in this table
  • Logon mode table
  • Session awareness (SAW) data filter table
  • Unformatted system services table
Code the DD name for SYS1.VTAMLIB as VTAMLIB. You should specify these subparameters on the DCB parameter, with BLKSIZE specified as full-track blocking relative to the capacity of your direct access storage device (DASD): 
RECFM=U,BLKSIZE=

Define SYS1.VTAMLIB as an authorized library (a library listed in the currently used IEAAPFxx).