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  9. 2.3 Relationship Between the CPU Configuration and Number of Root Complexes

Contents

  1. Preface
  2. Chapter 1 PCI Card Mounting Rules for the SPARC M12-1
    1. Click 1.1 Prerequisites
    2.  1.2 Maximum Number of Each Type of Mounted PCI Card and Available PCI Slots
    3.  1.3 Hardware Configuration Diagram
  3. Chapter 2 PCI Card Mounting Rules for the SPARC M12-2
    1. Click 2.1 Prerequisites
    2.  2.2 Maximum Number of Each Type of Mounted PCI Card and Available PCI Slots
    3.  2.3 Relationship Between the CPU Configuration and Number of Root Complexes
  4. Chapter 3 PCI Card Mounting Rules for the SPARC M12-2S
    1. Click 3.1 Prerequisites
    2.  3.2 Maximum Number of Each Type of Mounted PCI Card and Available PCI Slots
    3.  3.3 Relationship Between the CPU Configuration and Number of Root Complexes
  5. Chapter 4 Factory-Default Mounting Order of PCI Cards
  6. Appendix A List of the Operating Environment of the PCI Cards
  7. Appendix B Cards That Support PCI Hot Plug and Dynamic Reconfiguration
  8. Appendix C Cards/On-Board Devices That Support SR-IOV
  9. Appendix D Cards/On-Board Devices That Support Assignment of PCIe End Point Devices (PCIe Cards)
  10. Appendix E Cards That Support EFI (GPT) Labeled Disks

2.3 Relationship Between the CPU Configuration and Number of Root Complexes


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 after on-site CPU module expansion has a default value of 4. It remains at this number by default. In this case, the system configuration can be kept as is since the I/O bus is not reconfigured. The PCI card mounting rules are also inherited, so the same 1-CPU configuration rules apply.
To change the number of root complexes to eight, the system administrator needs to change the XSCF settings to reconfigure the I/O bus. For details on how to set the number, 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 may be required for any device path name used by an application. An example of this reconfiguration is to set a device path name again.
Table 2-5  Relationship Between the CPU Configuration and Number of Root Complexes
  Ordered Only for Server Ordered for CPU Module
  Ordered Together With Server
(Mounting at Factory)		 Ordered Separately From Server (Expansion on Site)
  Without I/O Bus Reconfiguration With I/O Bus Reconfiguration
Number of CPUs 1 2 2 2
Number of root complexes 4 8 4 8
Figure 2-1 is a hardware configuration diagram of the SPARC M12-2 with 1 CPU. Figure 2-2 is a hardware configuration diagram of the SPARC M12-2 with 2 CPUs.
Figure 2-1  Hardware Configuration Diagram of the SPARC M12-2 With 1 CPU
Figure 2-1 Hardware Configuration Diagram of the SPARC M12-2 With 1 CPU
Figure 2-2  Hardware Configuration Diagram of the SPARC M12-2 With 2 CPUs
Figure 2-2 Hardware Configuration Diagram of the SPARC M12-2 With 2 CPUs

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