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Performance notes
Use the information in this section to help determine the maximum number of adapters that can be
placed in a system while still maintaining optimum performance.
Performance notes regarding GX++ channel adapters
Table 4 on page 9 identifies the slot placement priorities and the maximum number of specified adapters
that can be installed for connectivity. However, for optimum performance, you might want to further
limit the total number of high bandwidth and extra-high bandwidth adapters. The system supports the
FC 5266 GX++ dual port adapter. When plugging in these adapters, if only one adapter is being
configured it must be placed in the GX++ slot 2. This placement helps distribute the I/O traffic over the
GX buses to the processors.
PCI adapter placement rules and slot priorities for the 31E/1C
Some adapters must be placed in specific PCI Express (PCIe) slots to function correctly or to perform
optimally. Learn how to determine the slot to install PCI adapters for the 7/10 (31E/1C) system.
PCI slot descriptions
The 31E/1C system has five PCIe x8 G2 low-profile slots and one PCIe x4 low-profile slot. All slots
support enhanced error handling (EEH), but are not hot pluggable. Figure 2 shows the rear view of the
system with the location codes for the PCI adapter slots. Table 5 describes the slots. All slots in this
system are low-profile slots only. Each PCIe is a separate PCI host bridge (PHB). The PCIe slot 1 and slot
4 have an x16 connector and the other slots have an x8 connector.
For the information about the maximum adapters supported on your system, see Table 6 on page 12.
Figure 2. Rear view of the 31E/1C with location codes
Table 5. PCI slot locations and descriptions
Slot
Location code
Slot 1
P1-C2
Slot 2
P1-C3
Slot 3
P1-C4
Slot 4
P1-C5
Slot 5
P1-C6
1, 2
Slot 6
P1-C7
Description
PCIe x8 G2
PCIe x8 G2
PCIe x8 G2
PCIe x8 G2
PCIe x8 G2
PCIe x4 G2
PHB
PCIe-PHB5
PCIe-PHB4
PCIe-PHB3
PCIe-PHB2
PCIe-PHB1
PCIe-PHB0
PCI adapter placement
Adapter size
Low-profile
Low-profile
Low-profile
Low-profile
Low-profile
Low-profile
11
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