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## D 

## Shared Memory Communications 

Naming:  The IBM z14 server generation is available as the following machine types and models: 

GLYPH<SM590000> Machine Type 3906 (M/T 3906), Models M01, M02, M03, M04, and M05 →  further identified as IBM z14 Model M0x , or z14 M0x . 

GLYPH<SM590000> Machine Type 3907 (M/T 3907), Model ZR1 →  further identified as IBM z14 Model ZR1 , or z14 ZR1 . 

In the remainder of this document, IBM z14 (z14)  refers to both machine types, unless otherwise specified. 

This appendix briefly describes the optional Shared Memory Communications (SMC) function that is implemented on IBM Z servers as Shared Memory Communications over Remote Direct Memory Access (SMC-R) and Shared Memory Communications - Direct Memory Access (SMC-D) of IBM z14, z13, and z13s servers. 

The following types adapters are available for SMC-R for physical connectivity: 

GLYPH<SM590000> 25Gbe RoCE Express2 (FC 0430) 

GLYPH<SM590000> 10GbE RoCE Express2 (FC 0412) 

GLYPH<SM590000> 10GbE RoCE Express (FC 0411): This adapter can be carried forward to z14 ZR1 

Throughout this appendix, we use the terms 10GbE RoCE Express  and RoCE Express  for both adapters, except when the adapter specifications differ. 

This appendix includes the following topics: 

GLYPH<SM590000> D.1, “Overview” on page 426 

GLYPH<SM590000> D.2, “Shared Memory Communication over RDMA” on page 426 

GLYPH<SM590000> D.3, “Shared Memory Communications - Direct Memory Access” on page 438 

