## 2.8.6 Defining Network 

This section provides planning considerations for deploying the network-related features: 

GLYPH<SM590000> OSA features 

GLYPH<SM590000> Shared Memory Communications (SMC-R and SMC-D) features: 

– SMC - RDMA over Converged Ethernet (RoCE) Express features (SMC-R) 

– SMC - Direct Memory Access over Internal Shared Memory (SMC-D) 

GLYPH<SM590000> HiperSockets 

## Open Systems Adapter (OSA) 

The OSA Express features are installed in an IBM z15 server PCIe+ I/O drawer. The features are available as different types and support several networking protocols. Depending on the types of OSAs installed in the z15, the CPC supports attachment with the following characteristics: 

GLYPH<SM590000> Copper-based Ethernet (1000 Mbps) 

GLYPH<SM590000> Fiber-based Gigabit Ethernet (GbE), Short Wave (SX), and Long Wave (LX) 

GLYPH<SM590000> Fiber-based 10-Gigabit Ethernet Short Reach (SR) and Long Reach (LR) 

Based on the intended use, the operating modes must be defined with channel type and device address. For configuration details, see Chapter 6, “Configuring network features” on page 129  and the OSA-Express Implementation Guide , SG24-5948. 

Starting with Driver Level 22 (HMC 2.13.0), HMC has been enhanced to take advantage of the Open Systems Adapter/Support Facility (OSA/SF) function for the OSA-Express6S, OSA-Express5S, and OSA-Express4S features. Either OSA/SF on the HMC or the OSA/SF in the operating system component can be used for the OSA-Express4S features. For the OSA-Express7S, OSA-Express6S and OSA-Express5S features, OSA/SF on the HMC is required. The OSA/SF is used primarily for these purposes: 

GLYPH<SM590000> Manage all OSA ports. 

GLYPH<SM590000> Configure all OSA non-QDIO ports. 

GLYPH<SM590000> Configure local MAC addresses. 

GLYPH<SM590000> Display registered IPv4 addresses (in use and not in use). It is supported on IBM Z platform for QDIO ports. 

GLYPH<SM590000> Display registered IPv4 or IPv6 Virtual MAC and VLAN ID associated with all OSA Ethernet features configured as QDIO Layer 2. 

GLYPH<SM590000> Provide status information about an OSA port and its shared or exclusive use state. 

See 6.3, “Customizing OSA-Express using OSA Ad vanced facilities” on  page 133 for details about the use of OSA/SF on the HMC. 

Note:  OSA-Express6S 1000Base-T adapter (FC 0426) is the last generation of OSA 1000Base-T adapters to support connections operating at 100Mbps link speed. OSA-Express7S 1000Base-T (FC 0466) supports only 1000Mbps duplex link speed only. 

## Shared Memory Communications - RDMA 

The 10GbE RoCE Express (FC #0411), the 10GbE RoCE Express2 (FC #0412), the 10GbE RoCE Express2.1 (FC #0432), the 25GbE RoCE Express2 (FC 0430) and the 25GbE RoCE Express2.1 (FC 0450) features are designed to help reduce CPU consumption for applications that use the TCP/IP stack without requiring application changes. Using the RoCE 

