Connecting Two Lpars On The Same Cpc Using Smc-D; Clustered Systems: Multitier Application Solution. Rdma, And Dma; D.3.1 Internal Shared Memory Technology Overview - IBM z13s Technical Manual

D.3.1 Internal Shared Memory technology overview

ISM is a new function supported by the z13 and z13s machines. It is the firmware that
provides the connectivity for shared memory access between multiple operating systems
within the same CPC. It provides the same functionality as SMC-R but without physical
adapters like the RoCE card, using instead virtual ISM devices as SMC-R. It is a Hipersocket
like function that provides guest-to-guest communications within the same machine.
Figure D-11 shows a possible solution using SMC-D only.
Figure D-11 Connecting two LPARs on the same CPC using SMC-D
Both SMC-D and SMC-R technologies can be used at the same time on the same CPCs.
Figure D-12 shows a fully configured three-tier solution using both SMC-D and SMC-R.
Clustered Systems: Example: Local and Remote access to DB2 from WAS (JDBC using DRDA)
Figure D-12 Clustered systems: Multitier application solution. RDMA, and DMA
D.3.2 SMC-D over Internal Shared Memory
ISM is a virtual channel similar to IQD for HiperSockets. A virtual adapter is created in each
OS. Using the SMC protocol, the memory is logically shared. The network is firmware
provided. A new device is required to manage that virtual function. SMC is based on a TCP/IP
connection and preserves the entire network infrastructure.
SMC-D is a protocol that allows TCP socket applications to transparently use ISM.
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IBM z13s Technical Guide
System z vPCI Firmware
LP 1 z/OS
Shared Mem
Sockets SMC
DB2
DRDA
vPCI ISM Virtual Function
SMC-R and SMC-D enabled platform
z/OS image 1 (WAS) z/OS image 2 (DB2)
shared memory
shared memory
client Server
Sockets
SMC
ISM
VCHID
Shared Memory Communications
via DMA (SMC-D using vPCI ISM)
IBM z13
Shared Memory Communications
z/OS
Shared Mem
SMC Sockets
ISM
FID 2
FID 1
VCHID
vPCI ISM Virtual Function
Sockets
SMC
RoCE
ISM
RDMA enabled (RoCE)
LP 2
CICS
SMC-R enabled platform
z/OS image 3 (WAS)
shared memory
Sockets
client
SMC
RoCE
Shared Memory Communications
via RDMA (SMC-R using RoCE)