9.1 RAS strategy 9.2 Structure change The RAS strategy is to manage change by learning from previous generations and investing  in new RAS function to eliminate or minimize all sources of outages. Enhancements to z13s  RAS designs are implemented on the z14 ZR1 system through the introduction of new  technology, structure, and requirements. Continuous improvements in RAS are associated  with new features and functions to ensure that IBM Z servers deliver exceptional value to  clients. The following overriding RAS requirements are principles as shown in Figure 9-1: The z14 ZR1 is a transitional machine, not just a simplified version of z14 M0x with the  following Goals:  GLYPH<SM590000> Inclusion of existing (or equivalent) RAS characteristics from previous generations. GLYPH<SM590000> Learn from current field issues and addressing the deficiencies. GLYPH<SM590000> Understand the trend in technology reliability (hard and soft) and ensure that the RAS  design points are sufficiently robust. GLYPH<SM590000> Invest in RAS design enhancements (hardware and firmware) that provide IBM Z and  Customer valued differentiation. GLYPH<SM590000> Enhanced system modularity  GLYPH<SM590000> Standardization to enable rapid integration  GLYPH<SM590000> Platform simplification Figure 9-1 Overriding RAS requirements The z14 ZR1 is built up in a new form factor that is an industry standard 19-inch rack. It is an  air cooled system that fulfills the requirements for an ASHRAE A3 environment (as the z13s).  The CPC Drawer and the PCIe+ I/O Drawer uses the same Chipsets and PCIe I/O adapters  as the z14 M0x models.  The power subsystem is completely redesigned and is now based on 200 - 240 V AC power  distribution units (PDU). This configuration uses a Power System Control Network (PSCN)  structure, which is the industry standard in data centers.  328  IBM 14 Model ZR1 Technical Guide