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Installation Considerations

The NFS client software depends on the SAS/C transient library, the SAS/C CSL transient library, and the TCP/IP software that are provided by your TCP/IP vendor. These must all be installed properly for the NFS client software to function correctly. See SAS/C Library Reference, Volume 2 for additional information.

The NFS client commands must be accessible to users. Under CMS, this involves accessing the disk. Under OS/390, the commands can be found if the commands are placed in linklist or LPALIB, or if they are in a data set that is allocated to the DDname CPLIB (provided that the optional SAS/C TSO command support is installed). Alternatively, OS/390 sites with REXX support can use REXX EXECs that invoke the commands. This avoids any need to install the SAS/C TSO command support.

In addition to mainframe installation considerations, you must coordinate NFS usage with the administrators of the NFS servers. They must grant the mainframe access in their configuration files. Additionally, they must install a login server for mainframe users to contact.

SAS/C CSL comes with distribution kits (in UNIX tar format) for two login servers. The first is the standard PCNFSD version 2 server from Sun Microsystems. The second is the CSL's sascuidd server, which is used for login without a password. If the NFS network is already running a PCNFSD version 1 server, it can be used instead of the PCNFSD version 2 server. The distribution kits include README and Makefile files to explain the process of building the programs under your login server operating environment.

PCNFSD may be difficult to port to some systems, particularly systems that are not UNIX systems. There are a number of alternative approaches to solve this problem. If there is a secure UNIX system available in the network that is already running PCNFSD, then that system can be used. If no such system is available, sites with mainframe security systems can rely exclusively on sascuidd (which is much easier to port). sascuidd runs on any POSIX system that also supports RPC applications. It is also possible to use an abbreviated version of PCNFSD. Only the authorization and null procedures are needed for CSL NFS. The other proceedures (mostly related to printing) are not needed.

Whatever server is installed and used, it must be running whenever mainframe users might need access to NFS files.

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