Qpi Topology - Fujitsu D3144 Technical Manual

3.2.1.3

QPI topology

The server uses "Intel® QuickPath Interconnect (QPI)" for the connection
between the CPUs and CPU I/O Hubs (IOH). Each CPU has 4 QPI ports and
the IOH has 2 QPI ports.
(0, 1; 0, 1, 2, 3) indicate the QPI port number of the CPU/IOH.
1
0
CPU
#1
3
1
2
IOH
#1
0 2
3
1
CPU
#2
0
Figure 2: QPI topology
Initially, the RX900 S2 can be configured with 4, 6, or 8 CPUMEMRs and each
CPUMEMR includes one CPU. If one of the CPUs is removed, the system uses
all of the remaining CPUs that form a consistent QPI topology. If removing one
CPU would result in an unsupported configuration, the system uses the next
supported configuration and CPUs not included in this configuration are set to
"disabled". As soon as the removed CPU has been reinstalled, the system
enables all those disabled CPUs that are needed to form the next supported
configuration.
D3144, D3145, D3146 (RX900 S2)
Figure 2 shows the QPI topology where the numbers
2
CPU
#4
1
3
0
0
IOH
#2
1
0
3
2
CPU
#3
1
Technical Manual
0
CPU
#7
2
3
1
1
IOH
#4
0
1
3
2
CPU
1
#8
0
Features
1
0
CPU
#5
3
0
2
IOH
#3
1
2
3
CPU
#6
0
25