For more information, see “ Coupling Thin Interrupts ” on page 112. The supported operating  systems are listed in Table 7-5 on page 251. Asynchronous CF Duplexing for lock structures Asynchronous cross-invalidate (XI) for CF cache structures z/VM Dynamic I/O support for InfiniBand and ICA CHPIDs 278  IBM z14 (3906) Technical Guide Asynchronous CF Duplexing enhancement is a general-purpose interface for any CF Lock  structure user. It enables secondary structure updates to be performed asynchronously with  respect to primary updates. Initially delivered with CFCC 21 on z13 as an enhanced  continuous availability solution, it offers performance advantages for duplexing lock structures  and avoids the need for synchronous communication delays during the processing of every  duplexed update operation.  Asynchronous CF Duplexing for lock structures requires the following software support: The supported operating systems are listed in Table 7-5 on page 251. Asynchronous XI for CF cache structures enables improved efficiency in CF data sharing by  adopting a more transactional behavior for cross-invalidate (XI) processing. which is used to  maintain coherency and consistency of data managers’ local buffer pools across the sysplex. Instead of performing XI signals synchronously on every cache update request that causes  them, data managers can “opt in” for the CF to perform these XIs asynchronously (and then  sync them up with the CF at or before transaction completion). Data integrity is maintained if  all XI signals complete by the time transaction locks are released. The feature enables faster completion of cache update CF requests, especially with cross-site  distance involved and provides improved cache structure service times and coupling  efficiency. It requires explicit data manager exploitation/participation, which is not transparent  to the data manager. No SMF data changes were made for CF monitoring and reporting. The following requirements must be met: z/VM dynamic I/O configuration support allows you to add, delete, and modify the definitions  of channel paths, control units, and I/O devices to the server and z/VM without shutting down  the system. 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 251. GLYPH<SM590000> CFCC Level 23 support, plus  GLYPH<SM590000> z/OS PTFs on every exploiting system in the sysplex: GLYPH<SM590000> Fixes for APAR OA54688 - Exploitation support z/OS 2.2 and 2.3  GLYPH<SM590000> Fixes for APAR OA54985 - Toleration support for z/OS 1.13 and 2.1 GLYPH<SM590000> Db2 V12 with PTFs for exploitation GLYPH<SM590000> z/OS V2R3, z/OS V2.2 SPE with PTFs for APAR OA47796 and OA49148 GLYPH<SM590000> z/VM V7R1, z/VM V6.4 with PTFs for z/OS exploitation of guest coupling environment GLYPH<SM590000> Db2 V12 with PTFs for APAR PI66689 GLYPH<SM590000> IRLM V2.3 with PTFs for APAR PI68378