Information Technology Reference
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memory boards are installed. This setup is possible on the M5000 because it has
two system boards available to be populated, and the second system can be used
without an IOU tray present.
Legend
System Board with One Domain
System Board with Two Domains and Two Floaters
System Board with Two Domains System Board with Four XSBs and No IOU
Figure 2.9
System Boards
The lack of an I/O controller for Quads 00-2 and 00-3 limits those quads to use
for domain expansion only. This is not the case for the M8000 and M9000, however.
The system board design for these high-end servers provides the most flexibility
in resource assignment. Because 4 I/O controllers are available on each system
board, each system board on the M8000/M9000 can support up to 4 domains, with
maximum domain counts of 16 domains on the M8000 and 24 domains on the
M9000.
Consider the several system board configurations for the M8000/M9000.
Figure 2.10, top left, is the simple case where the system board is in Uni-XSB
mode and supports a single domain. Figure 2.10, top right, shows a four-domain
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