Smoothly handling the data tsunami requires robust infrastructure that is designed specifically for high-volume data transactions. To take advantage of new unstructured data,$^{1}$ businesses on IBM Z can use application programming interfaces (APIs) that can help with creating and delivering innovative services. 

Linux on IBM Z, which is optimized for open source software, brings more value to the platform. Linux on IBM Z supports a wealth of new products that are familiar to application developers, such as Python, Scala, Spark, MongoDB, PostgreSQL, and MariaDB. By accessing core business data directly on platform (without the need for ETL$^{2}$, and hence no data offload off Z platform), you can develop new intelligent applications and business processes. 

As your business technology needs evolve to compete in today’s digital economy, IBM stands ready to help with intelligent, robust, and comprehensive technology solutions. The IBM approach integrates server, software, and storage solutions to ensure that each member of the stack is designed and optimized to work together. The new IBM z15™ leads that approach by delivering the power and speed users demand, the security users and regulators require, and the operational efficiency that maximizes your bottom line. 

Terminology note:  The remainder of this book uses the designation CPC  to refer to the central processor complex . 

## 1.2 z15 server highlights 

This section reviews some of the following most important features and functions of z15 (Driver 41) servers: 

## 1.2.1 Processor and memory 

GLYPH<SM590000> Processor and memory 

GLYPH<SM590000> Capacity and performance 

GLYPH<SM590000> Virtualization 

GLYPH<SM590000> I/O subsystem and I/O features 

GLYPH<SM590000> Reliability, availability, and serviceability design 

The system is packaged in 19-inch format frames. With 1 - 4 frames, and processor and I/O modular architecture, it provides flexible configuration and fit for purpose systems. 

IBM continues its technology leadership with the z15 server. The z15 server is built by using the IBM modular multi-processor drawer design that supports 1 - 5 processor drawers per CPC. Each processor drawer contains four Processor Unit (PU) single-chip modules (SCMs) and one Storage Controller (SC) SCM. 

Both SCMs are redesigned by using 14 nm FINFET SOI technology.$^{3}$ Each PU SCM has 12 processor units (PUs, or cores). In addition to SCMs, CPC drawers host memory DIMMs, connectors for I/O, redundant power supplies, combined Flexible Service Processors and Oscillators (FSP/OSC), and cooling manifolds. 

