OSA Dynamic LAN idle OSA Layer 3 virtual MAC for z/OS environments The OSA Dynamic LAN idle parameter change helps reduce latency and improve  performance by dynamically adjusting the inbound blocking algorithm. System administrators  can authorize the TCP/IP stack to enable a dynamic setting that previously was static.  The blocking algorithm is modified based on the following application requirements: In all cases, the TCP/IP stack determines the best setting based on the current system and  environmental conditions, such as inbound workload volume, processor utilization, and traffic  patterns. It can then dynamically update the settings.  Supported OSA-Express features adapt to the changes, which avoids thrashing and frequent  updates to the OAT. Based on the TCP/IP settings, OSA holds the packets before presenting  them to the host. A dynamic setting is designed to avoid or minimize host interrupts. OSA Dynamic LAN idle is supported by the OSA-Express$^{11,12}$ features on z14 ZR1 when in  QDIO mode (CHPID type OSD). The supported operating systems are listed in Table 7-8 on  page 221. To help simplify the infrastructure and facilitate load balancing when an LPAR is sharing an  OSA MAC address with another LPAR, each operating system instance can have its own  unique logical or virtual MAC (VMAC) address. All IP addresses that are associated with a  TCP/IP stack are accessible by using their own VMAC address instead of sharing the MAC  address of an OSA port. This situation also applies to Layer 3 mode and to an OSA port  spanned among channel subsystems. GLYPH<SM590000> For latency-sensitive applications, the blocking algorithm is modified considering latency. GLYPH<SM590000> For streaming (throughput-sensitive) applications, the blocking algorithm is adjusted to  maximize throughput. OSA Layer 3 VMAC is supported by the OSA-Express$^{11,12}$ features on z14 ZR1 when in  QDIO mode (CHPID type OSD). The supported operating systems are listed in Table 7-8 on  page 221. The z14 ZR1 offers systems programmers and network administrators the ability to more  easily solve network problems despite high traffic. With the OSA-Express Network Traffic  Analyzer and QDIO Diagnostic Synchronization on the server, you can capture trace and trap  data. This data can then be forwarded to z/OS tools for easier problem determination and  resolution. The Network Traffic Analyzer is supported by the OSA-Express$^{11,12}$ features on z14 ZR1  when in QDIO mode (CHPID type OSD). The supported operating systems are listed in  Table 7-8 on page 221. IBM z14 Model ZR1 provides the following major groups of cryptographic functions: Network Traffic Analyzer 7.4.6 Cryptography features and functions support GLYPH<SM590000> Synchronous cryptographic functions, which are provided by CPACF GLYPH<SM590000> Asynchronous cryptographic functions, which are provided by the Crypto Express6S  feature Chapter 7. Operating system support  265