## Coupling Express Long Reach 

The CE LR link provides point-to-point coupling connectivity at distances of 10 km (6.21 miles) unrepeated and defined as CHPID type CL5 in IOCP. The supported operating systems are listed in Table 7-5 on page 251. 

## InfiniBand coupling links 

HCA3-O$^{7}$ (12xIFB) fanout supports InfiniBand coupling links 12x at a maximum distance of 150 meters (492 feet) and defined as CHPID type CIB in IOCP. The supported operating systems are listed in Table 7-5 on page 251. 

## InfiniBand coupling links at an unrepeated distance of 10 km (6.2 miles) 

HCA3-O LR$^{7}$ (1xIFB) fanout supports InfiniBand coupling links 1x at an unrepeated distance of 10 KM (6.2 miles). The supported operating systems are listed in Table 7-5 on page 251. 

Note:  IBM z14 is last z Systems and IBM Z server to support HCA3-O fanout for 12x IFB (#0171) and HCA3-O LR fanout for 1x IFB (#0170).$^{a}$ As announced previously, z13s is the last mid-range z Systems server to support these adapters. 

Enterprises should begin migrating from HCA3-O and HCA3-O LR adapters to ICA SR or Coupling Express Long Reach (CE LR) adapters on z14, z13, and z13s. For high-speed short-range coupling connectivity, enterprises should migrate to the Integrated Coupling Adapter (ICA-SR). 

For long-range coupling connectivity, enterprises should migrate to the new Coupling Express LR coupling adapter. For long-range coupling connectivity requiring a DWDM, enterprises must determine their needed DWDM vendor’s plan to qualify the planned replacement long-range coupling links. 

IBM Z enterprises should plan to migrate off of InfiniBand coupling links. For high-speed short-range coupling connectivity, enterprises should migrate to the Integrated Coupling Adapter (ICA-SR). 

For long-range coupling connectivity, enterprises should migrate to the new CE LR coupling link. For long-range coupling connectivity that requires a DWDM, enterprises must determine their wanted DWDM vendor’s plan to qualify the CE LR. Reference Hardware Announcement 117-031, dated March 2017. 

a. All statements regarding IBM plans, directions, and intent are subject to change or withdrawal without notice. Any reliance on these statements of general direction is at the relying party’s sole risk and will not create liability or obligation for IBM. 

## Virtual Flash Memory use by CFCC 

VFM can be used in coupling facility images to provide extended capacity and availability for workloads that use Websphere MQ Shared Queues structures. The use of VFM can help availability by reducing latency from paging delays that can occur at the start of the workday or during other transitional periods. It is also designed to help eliminate delays that can occur when diagnostic data during failures are collected. 

## CFCC Coupling Thin Interrupts 

The Coupling Thin Interrupts enhancement is delivered with CFCC 19. It improves the performance of a CF partition and improves the dispatching of z/OS LPARs that are awaiting the arrival of returned asynchronous CF requests when used in a shared engine environment. 

