NonStop Operations Guide for H-Series and J-Series RVUs

Fibre Channel ServerNet Adapter (FCSA)
The FCSA provides fibre channel connectivity to certain external devices such as disk drives
contained in a Fibre Channel Disk Module (FCDM) enclosure that supports fibre channel disks and
an Enterprise Storage System (ESS).
Any connection between an NonStop system and a FCDM enclosure containing M8xxx fibre
channel disks requires the services of two processes: the Fibre Channel Storage (FCS) Manager,
which is part of the Storage Manager ($ZZSTO), and the FCS Monitor $FCSMON), a persistent
generic process that runs in all processors. An FCS Monitor process must be running in all
processors. Each of the two SACs on an FCSA can support as many as four FCDM enclosures, for
a total of eight per FCSA. The FCS manager process assigns a SAC on an FCSA to a particular
instance of the FCS monitor.
Up to 10 FCSAs can be housed in an I/O adapter module (IOAM), which is mounted in an IOAM
enclosure (except in NonStop NS14000 and NS1000 systems, where slot 1 is reserved for a
“4-Port ServerNet Extender (4PSE)”). The form factor and connection technology of IOAM enclosures
differ from the standard I/O enclosures that provide direct ServerNet access to external I/O devices.
A pair of ServerNet switch boards, also located in the IOAM enclosure, provide connectivity
between the processors and the FCSAs. All IOAM hardware can be monitored by OSM.
For information about the disk drives or tape drives supported through FCSAs for your J-series RVU,
refer to the J06.nn Release Version Update Compendium. For information about the disk drives or
tape drives supported through FCSAs for your H-series RVU, refer to the H06.nn Release Version
Update Compendium.
Gigabit Ethernet 4-Port Adapter (G4SA)
The M8800 Gigabit Ethernet 4-port ServerNet adapter (G4SA) provides Gigabit connectivity
between NonStop systems and Ethernet LANs. G4SAs are installed in slots 1 through 5 of an I/O
adapter module (IOAM) (except in NonStop NS14000 and NS1000 systems, where slot 1 is
reserved for a “4-Port ServerNet Extender (4PSE)”). There are two IOAMs in an IOAM enclosure,
so a total of 10 G4SAs can be installed in an enclosure. Although the G4SA supersedes the
Ethernet 4 ServerNet adapter (E4SA), Fast Ethernet ServerNet adapter (FESA), and the Gigabit
Ethernet ServerNet adapter (GESA), it cannot be installed in a NonStop S-series enclosure.
A G4SA has three primary system connections:
• Data transfer interface (ServerNet)
• Maintenance entity (ME) interface
• Power interface
The data transfer interface consists of ports to the ServerNet X and Y fabrics. The ports connect to
the ServerNet addressable controller (SAC) on the adapter. If one ServerNet fabric fails, the G4SA
can still be accessed using the remaining fabric.
The Maintenance Entity (ME) interface contains the circuitry required to meet the maintenance
system requirements of an active-logic adapter.
The G4SA receives power through a shielded, high-density, metric connector module. The connector
module provides attachments to the two ServerNet fabrics.
G4SAs are configured and managed through the Subsystem Control Facility (SCF) interface to the
ServerNet LAN Systems Access (SLSA) subsystem. The SLSA subsystem is preinstalled and
preconfigured and is started during the system-load sequence.
For information about the SLSA subsystem, refer to the LAN Configuration and Management
Manual.
I/O Adapters and Modules 107