Expand Configuration and Management Manual (G06.24+)

Configuring Direct-Connect and Satellite-Connect
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QIO Subsystem
QIO Subsystem
QIO is a mechanism for transferring data between processes through a shared
memory segment. The QIO subsystem is preconfigured and started during the system
load sequence. The QIO subsystem must be started before Expand line-handler
processes can be started.
For information about the QIO subsystem, refer to the QIO Configuration and
Management Manual.
Wide Area Network (WAN) Shared Driver
The WAN shared driver is a set of library procedures that is bound with each input-
output process (IOP) that uses a ServerNet wide area network (SWAN) concentrator.
The WAN shared driver is a component of the WAN subsystem. The WAN subsystem
is preconfigured and starting during the system load sequence.
For information about the WAN subsystem, refer to the WAN Subsystem Configuration
and Management Manual.
NonStop TCP/IP Process
The NonStop TCP/IP subsystem provides TCP/IP data communications connectivity.
NonStop TCP/IP processes are used by the following LAN adapters: Ethernet 4
ServerNet adapters (E4SAs), Fast Ethernet ServerNet adapters (FESAs), Gigabit
Ethernet ServerNet adapters (GESAs), Gigabit Ethernet 4-port ServerNet adapters
(G4SAs), and SWAN concentrators. The NonStop TCP/IP processes that support the
E4SAs, FESAs, GESAs, G4SAs, and SWAN concentrators are preconfigured and
started during the system load sequence.
For information about the NonStop TCP/IP, Parallel Library TCP/IP, and the NonStop
TCP/IPv6 subsystems, refer to the TCP/IP Configuration and Management Manual,
TCP/IP (Parallel Library) Configuration and Management Manual, and the TCP/IPv6
Configuration and Management Manual.
Local Area Network (LAN) Driver and Interrupt Handlers (DIHs)
NonStop TCP/IP processes can interface to the network through the ServerNet LAN
Systems Access (SLSA) subsystem. The SLSA subsystem provides QIO-based driver
and interrupt handlers (DIHs) that allow NonStop TCP/IP processes to connect to a
LAN adapter. The SLSA subsystem is preconfigured and started during the system-
load sequence.
For information about the SLSA subsystem, refer to the LAN Configuration and
Management Manual.