DCE/DFS: Disable DFS Client initialization

Description: The DFS client (DFSCM) is a physical file system that is started during z/OS UNIX initialization based on a FILESYSTYPE statement in the BPXPRMxx parmlib member. Starting with z/OS V1R13, the DFS client function is removed.

Steps to take: For parmlib updates, the following members should be the only IOEx programs listed in the AUTHPGM section of the IKJTSOxx parmlib member: All other IOEx programs need to be removed.
Note: The entry for program IOEDFSXP was introduced in SYS1.SAMPLIB(IKJTSO00) member by APAR OA37218 in z/OS V1R13.
If your installation uses the DFS client, you must remove the following statement from the BPXPRMxx parmlib member to prevent the client from initializing: 
FILESYSTYPE TYPE(DFSC)
	ENTRYPOINT(IOECMINI)
	PARM(’ENVAR("_EUV_HOME=/opt/dfslocal/home/dfscm") /
	>DD:IOEDFSD 2>&1’)
	ASNAME(DFSCM)
If this migration action is not performed before the first IPL of z/OS V2R1, you will receive the following error message: 
IOEP12402E:
As of z/OS Version 1 Release 13, the DFS client function has been removed.
z/OS UNIX will successfully initialize, but you will need to follow the guidance in the message to remove the entry and restart z/OS UNIX.

If you have not already done so, you should use the z/OS UNIX pax command to migrate any data in DCE DFS or Episode file systems to other file systems. The recommended general procedure is as follows:

  1. Set up a zFS file system to receive the data.
  2. Copy your DCE DFS or Episode file system data to the zFS file system, using the z/OS UNIX pax command.
  3. Set up a z/OS NFS server to allow data access from a remote z/OS UNIX system.
Reference information: Refer to the following documentation for more information about these migration steps.
Parent topic: Distributed File Service actions to perform before installing z/OS V2R1