Technical data

NFS Server
20.2 NFS Server Startup and Shutdown
Because the NFS protocol is stateless, clients with file systems mounted on
the server do not need to remount when the server is restarted. To ensure
this uninterrupted service, you must be sure all file systems are mapped
before restarting the NFS server. The simplest way to do this is to use the
SET CONFIGURATION MAP command.
To preserve site-specific parameter settings and commands, create the following
files. These files are not overwritten when you reinstall TCP/IP Services:
• SYS$STARTUP:TCPIP$NFS_SERVER_SYSTARTUP.COM can be used as a
repository for site-specific definitions and parameters to be invoked when the
NFS server is started.
• SYS$STARTUP:TCPIP$NFS_SERVER_SYSHUTDOWN.COM can be used as
a repository for site-specific definitions and parameters to be invoked when
the NFS server is shut down.
20.3 Running the NFS Server on an OpenVMS Cluster System
If the NFS server resides on more than one host in an OpenVMS Cluster system,
you can manage the proxy database and the export database as a homogeneous
OpenVMS Cluster system (one proxy file on the OpenVMS Cluster system) or a
heterogeneous OpenVMS Cluster system (a different proxy database on each host
in the cluster).
The NFS server automatically responds to the requests it receives on any TCP/IP
network interface. Therefore, if several OpenVMS Cluster nodes have Internet
cluster interfaces, the server can execute as a clusterwide application. Clients
that mount file systems using the cluster alias can then be served by any of
the NFS servers in the cluster. Because NFS uses cluster failover, if one of
the servers is taken down, client requests are redirected to another host in the
cluster.
To allow NFS clients to access the cluster, define a cluster alias and a network
interface name for each cluster member.
20.4 Setting Up PC-NFS
If you plan to export file systems to PC-NFS client hosts, you must enable
PC-NFS using TCPIP$CONFIG. The PC-NFS process starts automatically.
You can also use the following commands to manage PC-NFS:
• DISABLE SERVICE PCNFS (temporarily disables PC-NFS)
• ENABLE SERVICE PCNFS (enables PC-NFS)
• SHOW SERVICE PCNFS (displays information used for troubleshooting)
For information about setting up PC-NFS for printing, see Chapter 24.
20.5 Managing the MOUNT Service
The MOUNT service responds to Version 1 of the MOUNT protocol, which is used
with Version 2 of the NFS protocol. It also supports Version 3 of the MOUNT
protocol, which is used with Version 3 of the NFS protocol.
The MOUNT service is started automatically when you start the NFS server (for
example, using TCPIP$NFS_SERVER_STARTUP.COM).
20–8 NFS Server