Open System Services Management and Operations Guide (G06.25+, H06.03+)

Introducing Open System Services
Open System Services Management and Operations Guide—527191-002
1-15
Interprocess Communication Facilities
•
Multiple transport-provider processes can be used to create separately addressed
IP subnetworks within a node
When AF_INET sockets are used with NonStop Parallel Library TCP/IP:
•
No transport-agent process or transport-provider process is involved in data
routing.
•
A transport-agent process must still be started in each processor to initialize the
OSS sockets interface for that processor.
•
One transport-provider process must be running in the system. The transport-
provider process provides configuration compatibility for open and close operations
on sockets and for nonsensitive SCF commands.
When AF_INET sockets or AF_INET6 sockets are used with NonStop TCP/IPv6:
•
No transport-agent process or transport-provider process is involved in data
routing.
•
A transport-agent process must still be started in each processor to initialize the
OSS sockets interface for that processor.
•
At least one transport-provider process must be running in the system.
•
The transport-provider process provides configuration compatibility for open and
close operations on sockets and for nonsensitive SCF commands.
•
Multiple transport-provider processes can be used to create separately addressed
IP subnetworks within a node. This feature is called logical network partitioning;
such subnetworks are configured and controlled through the SCF interface for the
NonStop TCP/IPv6 subsystem.
Transport-Agent Processes
The transport-agent process initializes global sockets structures and tables when it
starts. A transport-agent process that routes data (for NonStop TCP/IP or AF_UNIX
sockets) among OSS sockets application processes does so for a single processor.
Each processor has its own copy of the transport-agent process.
HP provides a transport-agent process, $ZTAnn, where nn is the processor number.
The transport-agent process starts automatically when the processor comes up. You
can bring down its processor without first stopping the process, but you should stop all
applications with open OSS sockets before bringing down a processor. You manage
the transport agent through the SCF module of the OSS Monitor, as described in
Section 4, Managing Servers
.
Transport-Provider Processes
A transport-provider process provides routing services for one sockets address family.
Each node has one or more transport-provider processes.