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FUNCTION FID=102,VF=3,PCHID=13C,PART=((ARIES22),(=)),TYPE=HYL,* PORT=1 FUNCTION FID=103,VF=4,PCHID=13C,PART=((ARIES23),(=)),TYPE=HYL,* PORT=1 FUNCTION FID=104,VF=5,PCHID=13C,PART=((ARIES24),(=)),TYPE=HYL,* PORT=1 FUNCTION FID=105,VF=6,PCHID=13C,PART=((ARIES25),(=)),TYPE=HYL,* PORT=1 ** ************************************************************************ 

Table 15-1 on page 362 shows the list of applicable functions to the various function types. 

<img src='content_image/998401.jpg'>

a. zEDC parameters are not applicable on z15 (M/T 8561) 

Refer to the IBM Z Input/Output Configuration Program User’s Guide,  SB10-7172 for details about the maximum values for each machine type. 

## 15.2.2 Defining an ISM PCIe function 

Note:  For z15 (M/T 8561) function type zEDC is no longer valid 

## Overview 

The z15 supports Internal Shared Memory (ISM) virtual PCIe (vPCIe) device to enable optimized cross-LPAR TCP communications using a socket-based direct memory access (DMA), the Shared Memory Communications - Direct Memory Access (SMC-D). 

SMC-D uses a virtual PCIe adapter and is configured like a physical PCIe device. There are up to 32 ISM adapters, each with a unique Physical Network ID per CPC. 

## Internal Shared Memory technology 

ISM is a virtual PCI network adapter that enables direct access to shared virtual memory, providing highly optimized network communications for operating systems within the same IBM Z platform. 

Virtual memory is managed by each z/OS (similar to SMC-R logically shared memory) following the existing IBM Z PCIe I/O translation architecture. 

