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7-2 SPARC Enterprise M8000/M9000 Servers Service Manual • June 2010
Caution – Adjust the positioning of the routes appropriately so that the cables do
not cover a PCI cassette at the front of an IOU in the SPARC Enterprise M8000
server.
7.1 Overview of the IOU
This section provides an overview of IOUs and describes their mounting locations.
Each IOU consists of one I/O board (IOB), eight PCI slots, and up to four hard disk
drives (HDD). A PCI card or link card is mounted in a PCI slot by using a PCI
cassette. For slots in which no PCI card or link card is mounted, a filler panel may
occupy the slot. When an IOU is replaced, these mounted components (PCI cassettes,
PCI cards, HDDs, and other components) must be remounted. These mounted parts
must be remounted at the same locations in the new IOU as their original pre-swap
mounting locations.