1-18 SPARC Enterprise Mx000 Servers XSCF User’s Guide • August 2009
XSCF-LAN Redundancy
In the M3000/M4000/M5000/M8000/M9000 servers, the XSCF-LAN paths can be
made redundant (duplicated). If a LAN failure occurs, it contributes significantly to
reducing system availability. However, in a system equipped with a duplicate LAN,
the routes (paths) in the remaining network can be used even if one subnetwork is
faulty. In this way, high system availability can be achieved.
FIGURE 1-5 and FIGURE 1-6 show the network, which belongs to one or two different
subnets. In
FIGURE 1-5 and FIGURE 1-6, the ordinary lines represent subnetwork
connections and the thick lines represent network connections.
FIGURE 1-5 shows configurations with a single mounted XSCF Unit: one where the
LAN is not redundant, and the other with a redundant LAN.
FIGURE 1-5 XSCF-LAN Redundancy (In Entry-level and Midrange Servers)
In the configuration examples shown in FIGURE 1-6, the XSCF-LANs are redundant
and the XSCF Unit is in a redundant configuration.
In the configuration with a single XSCF Unit, XSCF-LAN cannot be used by any
XSCF Unit failure even if the XSCF-LANs are redundant (duplicated). If one
subnetwork is faulty, the remaining path can be used (
FIGURE 1-6-c). If the active
XSCF Unit is faulty, XSCF initiates failover (
FIGURE 1-6-d). Therefore, high network
availability can be achieved.
XSCF
System
Failure of
path or XSCF
a) No redundant LAN
XSCF
System
Failure of a path
b) Redundant LAN
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