An IOU can be added or removed using the DR function during system
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operation.
Active maintenance of PCI slots is possible using the PHP function.
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The IOU has eight PCI slots with PCI cassettes mounted. PCI cards can be
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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
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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
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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
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A dedicated LSI is used for the system control.
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For the bus connecting the control portion and crossbar unit, a high-speed link is
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used.
PCI-Express interface is being used.
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The IOU has a label bearing the printed component number and manufacture's
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serial number.
Appendix B
Components
B-9