482 IBM z13s Technical Guide
instead of 10 GbE. OSD connections can flow through the same 10 GbE switches or different
switches.
An OSA-Express feature, defined as channel-path identifier (CHPID) type OSD, is required to
establish SMC-R. Figure D-6 shows the interaction of OSD and the RNIC. The Open System
Adapter (OSA) feature might be a single or pair of 10 GbE, 1 GbE, or 1000Base-T OSAs. The
OSA needs to be connected to another OSA on the system with which the RoCE feature is
communicating. In Figure D-5, 1 GbE OSD connections can still be used instead of 10 GbE
and OSD connections can flow through the same 10 GbE switches.
Figure D-6 RNIC and OSD interaction
The following notes refer to Figure D-6:
The z/OS system administrator only must configure and manage the OSD interface.
The Communications Server transparently splits and converges network traffic to and from
the converged interface.
Only OSD connectivity must be configured.
With SMC-R, the RNIC interface is dynamically and transparently added and configured.
Note: The OSA-Express Adapter and the RoCE Express feature must be associated to
each other by having equal PNET IDs (defined in HCD). Simultaneous use of both 10 GbE
ports on a 10GbE RoCE Express feature and sharing by up to 31 LPARs on the same CPC
is available on z13 and z13s servers.
RNIC activation
Is AUTOMATIC
Single IP address
(single network interface)
Converged Interface
z/OS
OSD RNIC
OSD RNIC
Customer Network
RoCE fabric
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