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Appendix B Components B-9
■ An IOU can be added or removed using the DR function during system
operation.
■ 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 SPARC Enterprise 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.