IBM 890 manual OSA-Integrated Console Controller, Queued Direct Input/Output QDIO

The new Checksum offl oad support on the 1000BASE-T Ethernet feature, when operating in QDIO mode at gigabit speed, is designed to offl oad z/OS 1.5 and Linux TCP/IP stack processing of Checksum packet headers for TCP/IP and UDP.

OSA-Integrated Console Controller

The new Open Systems Adapter Integrated Console Controller function (OSA-ICC) which is exclusive on the IBM z890 and z990 servers since it is based on the OSA- Express feature, supports the attachment of non-SNA 3270 terminals for operator console operations. Now, 3270 emu- lation for console session connections is integrated as part of the OSA-Express 1000BASE-T Ethernet feature of the zSeries and can help eliminate the requirement for external console controllers (2074, 3174) helping to reducing cost and complexity. The OSA-ICC can use one or both ports on an OSA-Express 1000BASE-T Ethernet feature with the appropriate Licensed Internal Code (LIC). The OSA-ICC is enabled using CHPID type OSC.

The OSA-ICC is designed to support up to 120 client con- sole LAN attached sessions either locally or remotely.

Support for this new feature will be available for z/VM Version 4 Release 4 with a PTF, z/OS 1.3, VSE/ESA 2.6 onwards and TPF.

Queued Direct Input/Output (QDIO)

The OSA-Express Gigabit Ethernet, 1000BASE-T Ethernet and Token-Ring features support QDIO. QDIO was fi rst introduced to the world on the z900, in Communication Server for OS/390 2.7.

Queued Direct Input/Output (QDIO), a highly effi cient data transfer architecture, allows an OSA-Express feature to directly communicate with the server’s communications program through the use of data queues in memory. QDIO eliminates the use of channel programs and channel con- trol words (CCWs), helping to reduce host interrupts and accelerate TCP/IP packet transmission.

TCP/IP connectivity is increased with the capability to allow up to a maximum of 160 IP stacks per OSA-Express port and 480 devices. This support is applicable to all the OSA-Express features available on the z890 and is pro- vided through the Licensed Code (LIC).

Full Virtual Local Area Network (VLAN) support is available on z890 in z/OS and z/OS.e 1.5 Communications Server (CS) for the OSA-Express 1000BASE-T Ethernet, Fast Ethernet and Gigabit Ethernet features when confi gured in QDIO mode. Full VLAN support in a Linux on zSeries environment was delivered for QDIO mode in April 2002 for z800 and z900.

z890 OSA-Express Gigabit Ethernet

The new OSA-Express Gigabit Ethernet LX and Gigabit Ethernet SX features introduced on the z990 replace the z900/z800 Gigabit Ethernet features for new build z890.

The new OSA-Express GbE features have a new connector type, LC Duplex, replacing the current SC Duplex connec- tors used on the prior z900/z800 Gigabit Ethernet features.

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