PCI/PCI-X/PCIe Configurations
PCI/PCI-X/PCIe slots are numbered from one through ten in the server (
Figure 65
).
The following describes configuration requirements for slots 1 through 10 on the PCI/PCI-X/ I/O
backplane:
•
PCI-X slots 1 and 2 are reserved for use by the core I/O cards SAS core I/O cards and the
Gigabit Ethernet LAN core I/O card. Slots 1 and 2 are not hot-pluggable. Install only supported
PCI-X SAS and LAN core I/O cards in slots 1 and 2. PCIe SAS core I/O is installed in slots
3 and 4 on the PCI/PCI-X/PCIe IOBP. Depending upon the number and type of SAS core I/O
cards installed on the system, the Gigabit Ethernet LAN core I/O card may be installed in slot
10.
•
Slots 3 and 4 are nonshared slots. The maximum speed for cards in slots 3 and 4 is PCI-X
266 MHz.
•
Slots 5 and 6 are nonshared slots. The maximum speed for cards in slots 5 and 6 is PCI-X
133 MHz.
•
Slots 7, 8, 9, and 10 are shared slots. These four slots are limited by bus-mode or
frequency-related incompatibilities. If you use different modes, such as PCI instead of PCI-X,
or different card speeds in a shared bus environment, the slot automatically downgrades to
the lesser mode or speed. The maximum capability of each slot is PCI-X 66 MHz.
NOTE:
Shared slots have card compatibility restrictions. If one of the shared slots is occupied,
the card added to the second slot is limited by the configuration of the occupied slot. If the
new card has a slower capability than the current bus configuration, it fails. If the new card
has a faster capability than the current bus configuration, it only runs at the slower bus mode
and frequency of the current bus configuration.
The following are common configuration scenarios for cards that use shared slots. These
examples also apply to slots nine and ten because they are shared (both use a common bus).
1.
If there is a PCI-X 66 MHz card in slot 7, and you hot-plug a PCI 33 MHz card into slot
8, the operation fails. The new PCI 33 MHz card does not initialize and the slot powers
down because you cannot change bus speed during hot-plug operations. The new card
has a slower bus speed than the current card.
NOTE:
If the server is rebooted in this configuration, both cards initialize to run at PCI
33 MHz. The system firmware can only change the bus capability down to the lowest
common value.
2.
If there is a PCI 33 MHz card in slot 7, and you hot-plug insert a PCI-X 66 MHz card into
slot 8, the new card works but it runs at PCI 33 MHz.
3.
If the server is powered off, and you insert a PCI 33 MHz card into slot 7 (that shares a
common bus with a PCI-X 66 MHz card in slot 8), then both cards run at PCI 33 MHz
when the server powers up.
The following describes configuration requirements for slots one through ten on the PCI/PCI-X/PCIe
I/O backplane:
•
PCI-X slots 1 and 2 are reserved for use by the core I/O cards PCI-X SAS core I/O cards and
the Gigabit Ethernet LAN core I/O card. Slots 1 and 2 are not hot-pluggable. Install only
supported PCI-X SAS and LAN core I/O cards in slots 1 and 2. PCIe slots 3 and 4 are used
for the PCIe SAS Core I/O cards, but are public slots. If the PCIe core I/O is not installed,
these slots are available for other PCIe I/O cards.
•
Slots 3 and 4 are swtiched PCIe x8
•
Slots 5 and 6 are nonswitched PCIe x8.
194
Removing and Replacing Server Components
