D3081, D3131, D3082 (RX900 S1)
Technical Manual
27
Features
3.2.1.3
QPI topology
The server uses an interconnect "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.
Figure 3
shows the QPI topology where the
numbers (0, 1; 0, 1, 2, 3) indicate the QPI port number of the CPU/IOH.
Figure 3: QPI topology
Initially, the RX900 S1 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.
CPU
#1
CPU
#4
CPU
#7
CPU
#5
CPU
#2
CPU
#3
CPU
#6
IOH
#1
IOH
#2
IOH
#3
IOH
#4
0
1
0
1
0
1
0
1
1
2
3
0
1
2
3
0
1
2
3
0
1
2
3
0
1
2
3
0
1
2
3
0
1
2
3
0
1
2
3
0
CPU
#8
