Virtualization - IBM z13s Technical Manual

that use TCP/IP communications can benefit immediately without requiring any application
software or IP topology changes.
With its lightweight design, SMC-D is designed to improve throughput, latency, and CPU
consumption over other alternatives without sacrificing quality of service. SMC-D extends the
benefits of SMC-R to the same CPC operating system instances without requiring physical
resources such as RoCE adapters, PCI bandwidth, ports, I/O slots, network resources, 10
GbE switches, and so on. SMC-D requires either OSA connections or HiperSockets to
establish the initial TCP connection, and can coexist with them.
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.
Notes:
SMC-D
Shared Memory Communication protocols (SMC-R and SMC-D) do not currently
support multiple IP subnets.
zEDC Express
The growth of data that needs to be captured, transferred, and stored for large periods of time
is unrelenting. The large amounts of data that needs to be handled require ever-increasing
bandwidth and storage space. Software-implemented compression algorithms are costly in
terms of processor resources, and storage costs are not negligible.
Beginning with zEC12,bandwidth and storage space requirements are addressed by
providing hardware-based acceleration for data compression and decompression. zEDC, an
optional feature that is available for z13s, provides data compression with lower CPU
consumption than previously existing compression technology on z Systems. zEDC
compression provides these advantages, among others:
QSAM/BSAM for better disk utilization and batch elapsed time improvements
SMF for increased availability and online storage reduction
DFSMSdss for better disk and tape utilization for backup data
Java for high throughput standard compression through java.util.zip
Encryption Facility for z/OS for better industry data exchange
IBM Sterling Connect: Direct for z/OS for better throughput and link utilization
ISV support for increased client value
DFSMShsm for improved throughput and MIPS reduction
For more information, see Appendix J, "IBM zEnterprise Data Compression Express" on
page 551.

1.2.4 Virtualization

The IBM Processor Resource/Systems Manager™ (PR/SM) is Licensed Internal Code (LIC)
that manages and virtualizes all the installed and enabled system resources as a single large
symmetric multiprocessor (SMP) system. This virtualization enables full sharing of the
installed resources with high security and efficiency. It does so by configuring up to 40 LPARs,
each of which has logical processors, memory, and I/O resources, and are assigned from the
installed CPC drawers and features. For more information about PR/SM functions, see 3.7,
"Logical partitioning" on page 116.
LPAR configurations can be dynamically adjusted to optimize the virtual servers' workloads.
On z13s servers, PR/SM supports an option to limit the amount of physical processor
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IBM z13s Technical Guide
does not support Coupling facilities or access to the IEDN network.