LAN Configuration and Management Manual

Introduction to the SLSA Subsystem
LAN Configuration and Management Manual—520469-012
2-8
System-Level Processes and Libraries
System-Level Processes and Libraries
The SLSA subsystem uses the shared-memory segment (provided by the QIO
subsystem) to move the ownership of data between processes. (Refer to the QIO
Configuration and Management Manual for more information about QIO.) SLSA also
uses a QIO-based driver interrupt handler (DIH) to communicate with the appropriate
adapter type over the ServerNet system area network (SAN). The DIH controls the
Figure 2-4. The SLSA Subsystem Role Within a NonStop System
Processor
LAN
Adapter
QIO
Shared
Memory
Segment
User Applications
Socket Library
I/O
Process*
IPX/SPXTCP/IP
Expand
LAN Service Providers
Legend
SLSA Subsystem
SCF
Y-Fabric
WAN
Subsystem
LAN Driver Interrupt Handler (DIH)
PAM
SNAX/TR
SLSA Hardware
and Firmware
LIF LIF LIF LIF
VST800.vsd
I/O processes
that use
the WAN subsystem
include:
X25AM, AM, TR,
CP6100, ENVOY,
Envoy ACP/XF,
Expand, SNAX/APN,
and SNAX/XF.
File or
Message
System
Interface
SLSA Processes
X-Fabric
LAN
Adapter
LAN
Adapter
LAN
Adapter
LAN
Adapter
LAN
Adapter
LAN
Adapter
LAN
Adapter