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Appendix B Components B-9
B.4 I/O Unit
An I/O Unit (IOU) consists of an I/O board (IOB) with two types of control LSIs and a DDC
mounted, an HDD, and a PCI cassette. An IOU can be combined with a CMU to configure a
system (domain).
FIGURE B-4 shows the IOU.
FIGURE B-4 I/O Unit (IOU)
The IOU has the following characteristics.
■ Active maintenance of IOUs is possible using the DR function.
■ Active replacement of a failed IOU during system operation is possible using the DR
function.
■ An IOU can be added or removed using the DR function during system operation.