IBM Power System 9009-42A Manual page 24

Table 6. PCIe slot locations and descriptions for the EMX0 PCIe3 expansion drawer (continued)
Location code
P2-C5
P2-C6
1
Slots P1-C1 and P2-C1 inherit the I/O Adapter Enlarged Capacity attribute from the slot in the system
that connects to the EMX0 PCIe3 expansion drawer.
Notes:
• All slots are PCIe3 slots.
• All slots support full-length, full-height adapters or short form-factor with a full-height tailstock in
single-wide, generation 3, blind-swap cassettes.
• Slots C1 and C4 in each PCIe3 6-slot fanout module are PCIe3 x16 buses and slots C2, C3, C5, and C6
are PCIe x8 buses.
• All slots support enhanced error handling (EEH).
• All PCIe slots are hot swappable and can be serviced with the power on.
• All six adapters in a fanout module can be in SR-IOV shared mode.
• Of the six adapters in SR-IOV shared mode in a fanout module, a maximum of two adapters can be
either FC EC2S or EC2U.
Firmware slot capabilities
System PCIe slots are allocated direct memory access (DMA) space using the following algorithm:
• All slots are allocated a 2 GB default DMA window.
• Slots P1-C1 and P2-C1 inherit the I/O Adapter Enlarged Capacity attribute from the slot in the system
that connects to the EMX0 PCIe3 expansion drawer.
• All other I/O adapter slots are allocated Dynamic DMA Window (DDW) capability based on installed
platform memory. DDW capability is calculated assuming 4K I/O mappings:
– For systems with less than 64 GB of memory, slots are allocated no DDW capability.
– For systems with at least 64 GB of memory, but less than 128 GB of memory, slots are allocated 16
GB of DDW capability.
– For systems with at least 128 GB of memory, but less than 256GB of memory, slots are allocated 32
GB of DDW capability.
– For systems with 256 GB or more of memory, slots are allocated 64 GB of DDW capability.
PCIe adapters placement rules
Use this information while selecting slots for installing PCIe adapters in the EMX0 PCIe3 expansion
drawer attached to the system. Use Table 7 on page 11 to identify slot placement priorities and the
maximum number of adapters that can be installed in the EMX0 PCIe3 expansion drawer based on the
operating system.
Note: You can click the link that appears in the feature code column for more technical information
specific to the PCIe adapter.
• If the EMX0 PCIe3 expansion drawer is configured with two PCIe3 6-slot fanout modules, distribute the
PCIe adapters across both I/O modules whenever possible.
10 Power Systems: PCIe adapter placement for the 9009-41A, 9009-42A, or 9223-42H
Description
PCIe3 x8
PCIe3 x8
Slot capabilities
SR-IOV Dynamic direct
memory access
(DMA) window
Yes Yes
Yes Yes
I/O adapter
enlarged capacity
enablement order
No
No