zHyperLink Express (FC 0431) Requirements of zHyperLink zHyperLink is a new technology that provides up to 5x reduction in I/O latency times for Db2  read requests with the qualities of service IBM Z clients expect from I/O infrastructure for Db2  v12 with z/OS 2.1 with patches. The zHyperLink Express feature (FC 0431) provides a low latency direct connection between  z14 ZR1 and DS8880 I/O Port.  The zHyperLink Express is the result of new business requirements that demand fast and  consistent application response times. It dramatically reduces latency by interconnecting the  z14 ZR1 directly to I/O Bay of the DS8880 by using PCIe Gen3 x 8 physical link (up to  150-meter [492-foot] distance). A new transport protocol is defined for reading and writing  IBM CKD data records$^{7}$, as documented in the zHyperLink interface specification. On z14 ZR1, zHyperLink Express card is a new PCIe adapter, which installed in the PCIe+  I/O drawer. HCD definition support was added for new PCIe function type with PORT  attributes. The zHyperLink Express feature is available on z14 ZR1 servers, and includes the following  requirements: Up to 16 zHyperLink Express adapters can be installed in a z14 ZR1 (up to 32 links).  The zHyperLink Express is virtualized as a native PCIe adapter and can be shared by  multiple LPARs. Each port can support up to 127 Virtual Functions (VFs), with one or more  VFs/PFIDs being assigned to each LPAR. This configuration gives a maximum of 254 VFs  per adapter. The zHyperLink Express requires the following components: For DS8880 firmware R8.3 or newer, the I/O Bay planar is updated to support the  zHyperLink interface. This update includes the update of the PEX 8732 switch to  PEX8733 that includes a DMA engine for the zHyperLink transfers, and the upgrade from  a copper to optical interface by a CXP connector (provided). The zHyperLink Express uses optical cable with MTP connector. Maximum supported  cable length is 150 meters (492 feet). GLYPH<SM590000> z/OS 2.1 or later GLYPH<SM590000> DS888x with I/O Bay Planar board and firmware level 8.3 GLYPH<SM590000> z14 with zHyperLink Express adapter (FC 0431) installed GLYPH<SM590000> FICON channel as a driver GLYPH<SM590000> Only ECKD supported  GLYPH<SM590000> z/VM is not supported GLYPH<SM590000> zHyperLink connector on DS8880 I/O Bay  GLYPH<SM590000> Cable 4.6.3 Network connectivity OSA-Express7S Communication for LANs is provided by the OSA-Express7S, OSA-Express6S,  OSA-Express5S, OSA-Express4S (except 1000BASE-T), 10GbE RoCE Express2, and  10GbE RoCE Express features.  OSA-Express7S 25 Gigabit Ethernet SR (FC 0429) is installed in the PCIe+ I/O Drawer. 7 CKD data records are handled by using IBM Enhanced Count Key Data (ECKD™) command set. 142  IBM 14 Model ZR1 Technical Guide