LPAR Support of OSA-Express

For z990 customers or customers who use the Processor Resource/Systems Manager (PR/SM) capabilities IBM offers the Multiple Image Facility (MIF), allowing the shar- ing of physical channels by any number of LPARs. Since a port on an OSA-Express feature operates as a channel, sharing of an OSA-Express port is done using MIF. The LPARs are defi ned in the Hardware Confi guration Defi ni- tion (HCD). Depending upon the feature, and how it is defi ned, SNA/APPN/HPR and TCP/IP traffi c can fl ow simul- taneously through any given port.

IPv6 Support

IPv6 requires the use of an OSA-Express adapter running in QDIO mode and is supported only on OSA-Express features on zSeries at driver level 3G or above. IPv6 is supported on OSA-Express for zSeries Fast Ethernet, 1000BASE-T Ethernet and Gigabit Ethernet when running with Linux on zSeries, z/VM V5.1, and z/OS V1.4 and later. z/VM V4.4 provided IPv6 support for guest LANs.

more effi cient technique for I/O interruptions designed to reduce path lengths and overhead in both the host operating system and in the adapter. This benefi ts OSA- Express TCP/IP support in both Linux for zSeries and z/VM.

The z990’s support of virtual machine technology has been enhanced to include a new performance assist for virtualization of adapter interruptions. This new z990 performance assist is available to V=V guests (pageable guests) that support QDIO on z/VM V4.4 and later. The deployment of adapter interruptions improves effi ciency and performance by reducing z/VM Control Program overhead.

Performance enhancements for virtual servers

Two important networking technology advancements are announced in z/VM V4.4 and Linux on z990:

The high performance adapter interrupt handling fi rst introduced with HiperSockets is now available for both OSA-Express in QDIO mode (CHPID=OSD) and FICON Express (CHPID=FCP). This advancement provides a

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IBM z/OS manual Lpar Support of OSA-Express, IPv6 Support, Performance enhancements for virtual servers