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2.3
Relationship Between the CPU
Configuration and Number of Root
Complexes
The 1-CPU configuration of the SPARC M12-2 consists of four root complexes, and
the 2-CPU configuration consists of four or eight root complexes. A root complex
consists of an I/O controller mounted on a processor and the PCI switches, PCI
devices, etc. under the I/O controller.
The number of root complexes at CPU module expansion on site is kept at the default
value of 4, by default. In this case, the system configuration can be kept as is since the
I/O bus is not reconfigured, but the PCI card mounting rules are also inherited, so
they are the same as those for the 1-CPU configuration.
To change the number of root complexes to eight, the system administrator needs to
change the XSCF settings to reconfigure the I/O bus reconfiguration. For details on
the setting method, see the man page for the setpparmode(8) command or the Fujitsu
SPARC M12 and Fujitsu M10/SPARC M10 XSCF Reference Manual. Changing the
number of root complexes to eight increases the maximum number of mounted PCI
cards. However, because device path names change with the reconfiguration of the
I/O bus, system reconfiguration such as to set a device path name again may be
required for any device path names used by applications.
Table 2-5 Relationship Between the CPU Configuration and Number of Root Complexes
Ordered Only for Server
Number of CPUs
1
Number of root
4
complexes
Fujitsu SPARC M12 PCI Card Installation Guide ･ July 2017
18
Ordered for CPU Module
Ordered Together With
Ordered Separately From Server (Expansion on Site)
Server
Without I/O Bus
(Mounting at Factory)
Reconfiguration
2
2
8
4
With I/O Bus
Reconfiguration
2
8
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