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B-10 SPARC Enterprise M8000/M9000 Servers Service Manual • October 2012
■ Active maintenance of PCI slots is possible using the PHP function.
■ The IOU has eight PCI slots with PCI cassettes mounted. PCI cards can be mounted on
PCI cassettes. Up to four HDDs (2.5 inch with SAS interface) can be mounted on an IOU.
■ Up to eight PCI-Express short cards can be mounted. If an IOU onboard device card
(IOUA) is mounted instead of a PCI-Express short card, such units as the internal hard
disk drive (HDD), internal CD-RW/DVD-RW drive unit, and tape drive unit can be
connected. Also, if a link card is mounted, the external I/O expansion unit can be cable-
connected to the servers, enabling more PCI cards to be mounted.
■ Even-number slots (#0, #2, #4, #6): PCI-Express short card or IOUA
Only an IOUA card in slot #0 or #4 can control up to two internal HDDs.
■ Odd-number slots (#1, #3, #5, #7): PCI-Express short card or link card
■ A dedicated LSI is used for the system control.
■ For the bus connecting the control portion and crossbar unit, a high-speed link is used.
■ PCI-Express interface is being used.
■ The IOU has a label bearing the printed component number and manufacture's serial
number.