Expand Configuration and Management Manual (G06.24+)

Configuring Expand-Over-IP Lines
Expand Configuration and Management Manual—523347-008
8-3
QIO Subsystem
Figure 8-2 illustrates the required components when an ATM 3 ServerNet adapter
(ATM3SA) is used to provide connectivity to an IP network. In this configuration, the
TCP/IP process can only be NonStop TCP/IP; Parallel Library TCP/IP and NonStop
TCP/IPv6 do not support ATM communications.
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 and running before Expand
line-handler processes can be started.
Refer to Shared Memory Area for QIO on page 18-48 for information on QIO
enhancements that enable you to have more control over certain aspects of memory
management. For information about the QIO subsystem, refer to the QIO Configuration
and Management Manual.
Figure 8-2. Expand-Over-IP Connectivity Components with ATM3SA
058CDT .CDD
Processor
Y-Fabric
X-Fabric
ATM3SA
ATM Subsystem
QIO
Shared
Memory
Segment
Expand-over-IP
Line-Handler
Process
TCP/IP
Process