Chapter 1
Introduction
Overview
8
I/O Subsystem
All of the I/O is integrated into the system by way of the PCI-X buses. The CC on each cell board
communicates with one system bus adapter (SBA). The SBA converts the SBA link protocol into “ropes”. A
rope is defined as a high-speed, point-to-point data bus. The SBA can support up to 16 of these high-speed
bi-directional links for a total aggregate bandwidth of approximately 4GB/s. The server supports a maximum
of two SBAs.
There are LBA chips on the PCI-X backplane that act as a bus bridge, supporting either one or two ropes and
capable of driving 33MHz or 66MHz for PCI cards. The LBAs can also drive at 66MHz or 133MHz for PCI-X
cards.
The PCI-X backplane is physically one board but behaves as two independent partitions. SBA 0, its associated
LBAs and eight PCI-X slots form I/O Partition 0. SBA 1, its associated LBAs and eight PCI-X slots form I/O
Partition 1. One I/O partition may be powered down separate from the other I/O partition.
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Страница 6: ...Tables vi ...
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Страница 74: ...Chapter 4 Cabling and Power Up Using the Checklist 66 ...
Страница 76: ...Index 68 U unpacking inspecting for damage 12 V verifying system configuration 61 voltage check 46 ...