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Shared Memory Communications Reference Information

This site provides a comprehensive list of reference material for solutions related to IBM Shared Memory Communications: SMC-R, SMC-D and SMC-AT.

SMC-R Overview Information:

The IBM zEnterprise® EC12 (and BC12) and z/OS® V2.1 introduce optimized communications with an innovative solution: Shared Memory Communications-Remote Direct Memory Access (RDMA) or SMC-R.

With SMC-R, System z® network capability takes a new leap, strengthening performance for sharing data and reducing data transmission network overhead. The new System z® RDMA over Converged Ethernet (RoCE) feature — 10GbE RoCE Express—enables industry-standard RDMA capability on the System z platform. As an RDMA-capable network interface card (RNIC), it can transfer data using direct memory-to-memory communication, reducing the CPU overhead of the networking software stack. SMC-R provides application transparent exploitation of this new RoCE feature reducing the network overhead and latency of data transfers, effectively offering the benefits of optimized network performance across processors. This breakthrough also lowers the CPU cost associated when moving large amounts of data.

SMC-D Overview Information:

The IBM Systems z13™ and z13s™ introduces Internal Shared Memory (ISM) virtual PCI function. ISM is a virtual PCI network adapter that enables direct access to shared virtual memory providing a highly optimized network interconnect for z Systems intra-CPC communications. z/OS V2R2 (PTF) introduces the capability to exploit ISM with Shared Memory Communications-Direct Memory Access or SMC-D. SMC-D provides the next generation of highly optimized intra-CPC communications.

SMC-AT Overview Information:

The SMC Applicability Tool (SMC-AT) was created to help customers evaluate the applicability and value of SMC-R and SMC-D in their environment with minimal effort and minimal impact. SMCAT is integrated within the TCP/IP stack (via PTF) and will gather new statistics that are used to project SMC applicability and benefits for the current system. SMC-AT does not require any special hardware.