## 9.6 z14 ZR1 availability characteristics 

The following functions include availability characteristics on z14 ZR1: 

GLYPH<SM590000> Concurrent memory upgrade 

Memory can be upgraded concurrently by using Licensed Internal Code Configuration Control (LICCC) if physical memory is available on the drawer. Memory plan ahead can be used at the time of initial configuration to provides more resources for future use. 

GLYPH<SM590000> Enhanced driver maintenance (EDM) 

One of the greatest contributors to downtime during planned outages is LIC driver updates that are performed in support of new features and functions. z14 ZR1 is designed to support the concurrent activation of a selected new driver level. 

GLYPH<SM590000> Concurrent fanout addition or replacement 

A PCIe fanout card provides the path for data between memory and I/O through PCIe cables. With z14 ZR1, hot-pluggable and concurrently upgradeable fanouts are available. Up to eight PCIe fanout are available to the CPC drawer for z14 ZR1. 

GLYPH<SM590000> Redundant I/O interconnect 

Redundant I/O interconnect helps maintain critical connections to devices. z14 ZR1 allows a single PCIe+ I/O drawer adapter a fanout card, or even a PCIe+ I/O drawer in a multi PCIe I/O drawer system to be removed and reinstalled concurrently during a repair action. Connectivity to the system I/O resources is maintained through a second path when planned thoroughly. 

GLYPH<SM590000> Dynamic oscillator switch-over 

z14 ZR1 has two oscillator cards: a primary and a backup. During a primary card failure, the backup card transparently detects the failure, switches over, and provides the clock signal to the system. 

GLYPH<SM590000> Processor unit (PU) sparing 

z14 ZR1 has one spare PU to maintain performance levels if an active CP, Internal Coupling Facility (ICF), Integrated Facility for Linux (IFL), IBM z Integrated Information Processor (zIIP), integrated firmware processor (IFP), or system assist processor (SAP) fails. Transparent integrated sparing for failed processors is supported. One spare PU is available per system. 

GLYPH<SM590000> Application preservation 

This function is used when a CP fails and no spares are available. The state of the failing CP is passed to another active CP, where the operating system uses it to successfully resume the task, in most cases without client intervention. 

GLYPH<SM590000> Cooling improvements 

The z14 air-cooled configuration includes a newly designed front to rear air cooling system. The fans, controls, and sensors are N+1 redundant. 

GLYPH<SM590000> FICON Express16S+ with Forward Error Correction (FEC) 

FICON Express16S+ features continue to provide a new standard for transmitting data over 16 Gbps links by using 64b/66b encoding. The new standard that is defined by T11.org FC-FS-3 is more efficient than the current 8b/10b encoding. 

FICON Express16S+ channels that are running at 16 Gbps can use FEC capabilities when connected to devices that support FEC. 

