9.6 z14 ZR1 availability characteristics The following functions include availability characteristics on z14 ZR1: 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. 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. 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.  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.  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> Concurrent memory upgrade GLYPH<SM590000> Enhanced driver maintenance (EDM) GLYPH<SM590000> Concurrent fanout addition or replacement GLYPH<SM590000> Redundant I/O interconnect GLYPH<SM590000> Dynamic oscillator switch-over GLYPH<SM590000> Processor unit (PU) sparing GLYPH<SM590000> Application preservation  GLYPH<SM590000> Cooling improvements GLYPH<SM590000> FICON Express16S+ with Forward Error Correction (FEC) 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. 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. The z14 air-cooled configuration includes a newly designed front to rear air cooling  system. The fans, controls, and sensors are N+1 redundant.  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.  Chapter 9. Reliability, availability, and serviceability  333