Which scenario would provide the best opportunity to justify the RoCE Express feature?
A . Shared memory communication from a distributed Linux application to an MQ Linux guest on a z Systems server.
B . A z/OS WebSphere application that communicates to DB2 running on a z/OS LPAR on a separate z Systems server.
C . CICS to CICS communication between z/OS LPARs within the same z Systems server.
D . A Linux system running MQ on a z Systems server communicating to a z/OS MQ within the same server.
Answer: A
Explanation:
RoCE Express provides an RDMA capable network adapter providing access to RDMA over Converged Ethernet (RoCE). RoCE provides an optimized network interconnect for System z communications. Along with RoCE Express, z/OS provided a new RDMA based solution called Shared Memory Communications over RDMA (SMC-R). SMC-R is a sockets based solution providing transparent access to RoCE for TCP sockets applications over standard Ethernet.
The IBM System z13 introduces the capability to share (virtualize) the 10GbE RoCE Express feature among multiple (up to 31) LPARs (or z/VM guest virtual machines) using standardized PCIe virtualization (SR-IOV) technology.
When RoCE Express is exploited by z/OS with SMC-R, the combined solutions provide two key value points:
References: https://www.ibm.com/developerworks/community/blogs/IBMCommserver/entry/ibm_system_z_10gbe_roce_express_virtualization?lang=en