Appendix G. Native Peripheral Component Interconnect Express 523
G.1.3 Resource groups
The IFP allocates two RGs for running the management functions of native PCIe feature
adapters. A native PCIe feature adapter is managed by one of the resource groups according
to which I/O domain this adapter is in.
As shown in Figure G-1, each I/O domain in a PCIe I/O drawer of z13s is logically attached to
one of the two resource groups: I/O domain 0 and 2 in the front of the drawer attached to RG1
and I/O domain 1 and 3 attached to RG2. The native PCIe I/O feature adapters in I/O
domain 0 and 2 are managed by RG1 for device drivers and diagnostic tools functions, and
adapters in I/O domain 1 and 3 are managed by RG2.
Figure G-1 I/O domains and resource groups managed by the IFP
Up to two PCIe I/O drawers are supported on the z13s. For multiple PCIe features of the
same type, each feature is always assigned to a different I/O domain (of the two domains
implemented), and, if available, installed in a different PCIe I/O drawer, to eliminate the
possibility of a single point of failure.
Currently, an I/O domain of the PCIe I/O drawer can support a total of two native PCIe feature
adapters, together with the existing PCIe feature cards (FICON, OSA, and Crypto).
The following native PCIe features are supported in the PCIe I/O drawer:
Flash Express
zEDC Express
10GbE RoCE Express
Though only zEDC Express and 10GbE RoCE Express features are managed by the IFP and
resource groups, a Flash Express feature is always counted as a native PCIe feature installed
in a PCIe I/O drawer.
Front
7U
Domain 0 Domain 2
1, 2, 3, 4 6, 7, 8, 9 11,12,13,14 16,17,18,19
7U
Rear
Domain 3 Domain 1
20,21,22,23 25,26,27,28 30,31,32,33 35,36,37,38
Resource group 1
I/O Domain 0 and 2
Resource group 2
I/O Domain 1 and 3
Integrated Firmware Processor (IFP)
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