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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.