HiperSockets Network Concentrator

This support gives the user the ﬂ exibility to optimize and tune each HiperSockets to the predominant trafﬁ c proﬁ le, for example to distinguish between “high bandwidth” workloads such as FTP versus lower bandwidth interactive workloads.

The HiperSockets function provides many possibilities for improved integration between workloads in different LPARs, bound only by the combinations of operating systems and their respective applications. HiperSockets is intended to provide the fastest zSeries connection between e-business and Enterprise Resource Planning (ERP) solutions sharing information while running on the same server. WebSphere http and Web Application Servers or Apache http servers can be running in a Linux image (LPAR or z/VM guest) and will be able to use HiperSockets for very fast TCP/IP trafﬁ c transfer to a DB2 database server running in a z/OS LPAR. System performance is optimized because this allows you to keep your Web and transaction application environ- ments in close proximity to your data and helps eliminate any exposure to network related outages, thus improving availability.

The z/OS HiperSockets Accelerator function can improve performance and cost efﬁ ciencies when attaching a high number of TCP/IP images via HiperSockets to a “front end” z/OS system for shared access to a set of OSA-Express adapters.

HiperSockets VLAN support in a Linux environment: Virtual Local Area Networks (VLANs), IEEE standard 802.1q, is now being offered for HiperSockets in a Linux for zSeries environment. VLANs can help reduce overhead by allow- ing networks to be organized for optimum trafﬁ c ﬂ ow; the

network is organized by trafﬁ c patterns rather than physi- cal location. This enhancement permits trafﬁ c to ﬂ ow on a VLAN connection between applications over HiperSockets and between applications on HiperSockets connecting to an OSA-Express Gigabit Ethernet, 1000BASE-T Ethernet, or Fast Ethernet feature.

HiperSockets broadcast support for IPv4 packets – Linux, z/OS, z/VM: Internet Protocol Version 4 (IPv4) broadcast packets are now supported over HiperSockets internal LANs. TCP/IP applications that support IPv4 broadcast, such as z/OS OMPROUTE when running Routing Information Protocol Version 1 (RIPv1), can send and receive broadcast packets over HiperSockets interfaces. This support is exclu- sive to z990. Broadcast for IPv4 packets is supported by Linux for zSeries. Support is planned to be available in z/OS V1.5. Support is also offered in z/VM V4.4 and later.

HiperSockets Network Concentrator support, exclusive to z890 and z990 can simplify network addressing between HiperSockets and OSA-Express. You can now integrate HiperSockets-connected operating systems into external networks, without requiring intervening network routing overhead, thus helping to increase performance and sim- plify conﬁ guration. With HiperSockets Network Concentra- tor support, you can conﬁ gure a special purpose Linux operating system instance, which can transparently bridge trafﬁ c between a HiperSockets internal Local Area Network (LAN) and an external OSA-Express network attachment, similar to a real Layer 2 switch which bridges between dif- ferent network segments. This support can make the inter- nal HiperSockets network address connection appear as if it were directly connected to the external network.