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2.2.1.1 Uni-XSB
Because Uni-XSBs constitute physical domaining with boundaries at the board
level, a Uni-XSB provides the best fault isolation. If a board fails in a configuration
that utilizes Uni-XSBs, only one domain is affected. Figures 2.4 and 2.5 show sys-
tem boards in Uni-XSB mode for the M4000/5000 and M8000/M9000, respectively.
Figure 2.4
M4000/M5000 System Board PSB
Figure 2.5
M8000/M9000 CMU/IOU PSB
Placing CMU/IOU boards in Uni-XSB mode offers the following advantages:
Memory performance can be maximized to eight-way interleaving.
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