This function refers exclusively to the z/VM dynamic I/O support of InfiniBand and ICA  coupling links. Support is available for the CIB and CS5 CHPID type in the z/VM dynamic  commands, including the  change channel path dynamic I/O command.  Specifying and changing the system name when entering and leaving configuration mode are  also supported. z/VM does not use InfiniBand or ICA, and does not support the use of  InfiniBand or ICA coupling links by guests. The supported operating systems are listed in  Table 7-5 on page 263. In this section, we describe the storage connectivity-related features and functions. z14 introduces IBM zHyperLink Express as a brand new IBM Z input/output (I/O) channel link  technology since FICON. zHyperLink Express is designed to help bring data close to  processing power, increase the scalability of Z transaction processing, and lower I/O latency. zHyperLink Express is designed for up to 5x lower latency than High-Performance FICON for  Z (zHPF) by directly connecting the Z central processor complex (CPC) to the I/O Bay of the  DS8880. This short distance (up to 150 m [492.1 feet]), direct connection is intended to speed  Db2 for z/OS transaction processing and improve active log throughput.  The improved performance of zHyperLink Express allows the Processing Unit (PU) to make a  synchronous request for the data that is in the DS8880 cache. This feature eliminates the  undispatch of the running request, the queuing delays to resume the request, and the PU  cache disruption. Support for zHyperLink Writes can accelerate Db2 log writes to help deliver superior service  levels by processing high-volume Db2 transactions at speed. IBM zHyperLink Express  requires compatible levels of DS8000/F hardware, firmware R8.5.1 or later, and Db2 12 with  PTFs. The supported operating systems are listed in Table 7-6 on page 264 and Table 7-7 on  page 266. FICON Express16SA supports a link data rate of 16 gigabits per second (Gbps) and  autonegotiation to 8 Gbps for synergy with switches, directors, and storage devices. With  support for native FICON, High-Performance FICON for Z (zHPF), and Fibre Channel  Protocol (FCP), the IBM z15™ server enables you to position your SAN for even higher  performance, which helps you to prepare for an end-to-end 16 Gbps infrastructure to meet  the lower latency and increased bandwidth demands of your applications. The supported operating systems are listed in Table 7-6 on page 264 and Table 7-7 on  page 266. FICON Express16S+ supports a link data rate of 16 Gbps and autonegotiation to 4 or 8 Gbps  for synergy with switches, directors, and storage devices. With support for native FICON,  High-Performance FICON for Z (zHPF), and Fibre Channel Protocol (FCP), the IBM z14™  server enables you to position your SAN for even higher performance, which helps you to  prepare for an end-to-end 16 Gbps infrastructure to meet the lower latency and increased  bandwidth demands of your applications. FICON Express16S+ FICON Express16SA zHyperlink Express 7.4.4 Storage connectivity-related features and functions Chapter 7. Operating system support  293