ServerNet Cluster Web

or more other computer systems in a network. Nodes in a ServerNet cluster are
called "ServerNet nodes." Because ServerNet clusters use Expand, a ServerNet node
is also an Expand node.
What is a Nonstop™ Cluster Switch (Model 6770)? A Nonstop™ Cluster Switch
is an assembly consisting of a ServerNet II Switch, an uninterruptible power supply
(UPS), and an AC transfer switch. 6770 switches support the star topologies.
Click below to view NonStop™
Cluster Switch photo
What is a Nonstop™ ServerNet Switch (Model 6780)? A 6780 switch consists
of a logic board, 13 plug-in cards, two fans, and two power supplies. An
uninterruptible power supply (UPS) is not part of a 6780 switch; however, a
separate UPS is recommended for certain configurations of the layered topology.
What is a ServerNet II Switch? The ServerNet II Switch is the subcomponent of
a 6770 switch that provides a physical junction point for the fiber-optic cables that
link the nodes in a ServerNet cluster. The ServerNet II Switch routes messages
across the external ServerNet fabrics. Only the ServerNet II Switch is supported for
use in a 6770 switch.
What is an AC transfer switch? An AC transfer switch is a subcomponent of a
6770 switch that provides fault-tolerant access to dual AC power sources. The
ServerNet II Switch and UPS each have only a single power input. To provide
fault-tolerant power for these components, an AC transfer switch with two power
cords is connected to them. The AC transfer switch is connected to primary and
secondary current sources. The AC transfer switch draws power from its primary
current source as long as it is available. If the primary source fails, then the load is
switched to the secondary current source.
What is an MSEB? An MSEB is a modular ServerNet expansion board (MSEB).
MSEBs provide connections for the ServerNet cables that link a system enclosure to
another system enclosure or to a cluster. The MSEBs in group 01 of a Nonstop™
S-series server allow the connection of ServerNet cables from the server to the
cluster switches. These MSEBs route packets out of each server and onto the
external ServerNet fabrics. All packets destined for other nodes travel through port
6 of the MSEBs in slots 51 and 52 of group 01.
Click below to view MSEB photo
What is an external ServerNet fabric? It is one of two fabrics (X or Y) that link
the nodes in a ServerNet cluster. A fabric is a complex set of interconnections
through which there can be multiple paths from point to point. In a ServerNet