control layer of an OSA-Express QDIO interface, and uses no physical cabling or external networking connections. Data access is performed at memory speeds, bypassing external network delays and providing the users with high-speed logical LANs with minimal system and network overhead. 

HiperSockets can be defined as Multiple Image Facility (MIF)-shared in a CSS and as spanned channels across multiple CSSs. A HiperSockets CHPID can be seen as an internal LAN  to the server. The level of sharing is determined by the logical partitions you want to grant access to that LAN. 

HiperSockets is supported by the following operating systems: 

GLYPH<SM590000> All in-service z/OS releases 

GLYPH<SM590000> All in-service z/VM releases 

GLYPH<SM590000> All in service z/VSE releases 

GLYPH<SM590000> Linux on Z 

On a z15, HiperSockets support the following functions: 

GLYPH<SM590000> HiperSockets Broadcast 

Supported across HiperSockets on Internet Protocol Version 4 (IPv4) for applications. Applications that use the broadcast function can propagate the broadcast frames to all TCP/IP applications that are using HiperSockets. This support is applicable in Linux, z/OS, and z/VM environments. 

GLYPH<SM590000> VLAN support 

Virtual local area networks (VLANs) are supported by Linux on z Systems and z/OS V1R8 or later for HiperSockets. VLANs can reduce overhead by allowing networks to be organized by traffic patterns rather than physical location. This enhancement allows traffic flow on a VLAN connection both over HiperSockets and between HiperSockets and OSA-Express Ethernet features. 

GLYPH<SM590000> IPv6 support on HiperSockets 

GLYPH<SM590000> HiperSockets Network Concentrator 

Traffic between HiperSockets and OSA-Express can be transparently bridged by using the HiperSockets Network Concentrator. This configuration eliminates intervening network routing overhead, resulting in increasing performance and a simplified network configuration. This improvement is achieved by configuring a connector Linux system that has HiperSockets and OSA-Express connections defined to it. 

GLYPH<SM590000> HiperSockets Layer 2 support 

HiperSockets supports two transport modes on the z15 Layer 2 (Link Layer) and Layer 3 (Network and IP Layer). 

As with Layer 3 functions, HiperSockets Layer 2 devices can be configured as primary or secondary connectors or multicast routers. These configurations enable high performance and highly available Link Layer switches between the HiperSockets network and an external Ethernet. 

GLYPH<SM590000> HiperSockets multiple write facility 

HiperSockets performance has been increased by allowing streaming of bulk data over a HiperSockets link between logical partitions. Multiple writes with fewer I/O interrupts reduce processor usage of both the sending and receiving logical partitions, and is supported in z/OS 

GLYPH<SM590000> HiperSockets Completion Queue 

