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488 IBM z13s Technical Guide

Sysplex Distributor after RoCE

Figure D-10 shows a RoCE Sysplex Distributor:

򐂰 The initial connection request goes through the Sysplex Distributor stack.

򐂰 The session then flows directly between the client and the target over the RoCE cards.

Figure D-10 Sysplex Distributor after RoCE

D.2.11 Enabling SMC-R support in z/OS Communications Server

The following checklist provides a task summary for enabling SMC-R support in z/OS

Communications Server. This list assumes that you start with an existing IP configuration for

LAN access using OSD:

򐂰 HCD definitions (install and configure RNICs in the HCD):

– Add the PNet ID for the current OSD.

– Define PFIDs for RoCE (with the same PNet ID).

򐂰 Specify the GLOBALCONFIG SMCR parameter (TCP/IP Profile):

– Must specify at least one PCIe Function ID (PFID):

• A PFID represents a specific RNIC adapter.

• A maximum of 16 PFID values can be coded.

– Up to eight TCP/IP stacks can share a RoCE PCHID (RoCE feature) in a specific LPAR

(each stack must define a unique FID value).

򐂰 Start the IPAQENET or IPAQENET6 INTERFACE with CHPIDTYPE OSD:

– SMC-R is enabled, by default, for these interface types.

– SMC-R is not supported on any other interface types.

򐂰 Repeat in each host (at least two hosts).

Start the TCP/IP traffic and monitor it with Netstat and IBM VTAM displays.

Note: As with all RoCE communications, the session end also flows over OSAs.

Note: The IPv4 INTERFACE statement (IPAQENET) must also specify an IP subnet mask

IBM z13s User Manual

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