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The new Checksum offl oad support on these z890 features
is designed to offl oad z/OS 1.5 and Linux TCP/IP stack pro-
cessing of Checksum packet headers for TCP, IP and UDP.
NON-QDIO operational mode
The OSA-Express 1000BASE-T Ethernet, Fast Ethernet and
Token-Ring also support the non-QDIO mode of operation.
The adapter can only be set (via the CHPID type parameter)
to one mode at a time. The non-QDIO mode does not pro-
vide the benefi ts of QDIO. This support includes native SNA/
APPN, High Performance Routing, TCP/IP passthrough, and
HPDT MPC. The new OSA-Express 1000BASE-T Ethernet
provides support for TCP/IP and SNA/APPN/HPR up to 1
gigabit per second over the copper wiring infrastructure.
z890 OSA-Express Token-Ring
The same OSA-Express Token-Ring feature is supported
on z890, z800, z990 and z900. This Token-Ring supports
a range of speed including 4, 16 and 100 Mbps, and can
operate in both QDIO and non-QDIO modes.
Note: Statement of Direction
OSA-Express Token-Ring not to be offered: The zSeries 890
and 990 are expected to be the last zSeries servers to offer
a Token-Ring feature. It is intended that the OSA-Express
Token-Ring feature will not be available for ordering on a
new build or upgraded server, or for carrying forward on
an upgrade. A migration from a Token-Ring to an Ethernet
environment should be a part of all strategic LAN planning.
All statements regarding IBM’s plans, directions, and intent
are subject to change or withdrawal without notice.
QDIO Mode - TCP/IP
non-QDIO mode
SNA Passthru
TCP/IP Passthru
HPDT MPC
Server
Server
IP WAN
Intranet
SNA DLSw
TCP/IP
Native SNA
TN3270 browser
access to SNA
appls.
Enterprise
Extender for
SNA end points
TCP/IP
applications
Remote Office
IP WAN
Intranet
Remote Office
4/16 Mbps
Token-Ring
4/16 Mbps
Token-Ring
4/16 Mbps
Token-Ring
4/16 Mbps
Token-Ring
DSLw
Router
16/100 Mbps
Token-Ring
Server
Server
Internet or
extranet
4/16/100 Mbps
Token-Ring
Backbone
Switch/
Hub/
Router
4/16 Mbps
Token-Ring
IP Router
100 Mbps
Token-Ring
10/100 Mbps
Ethernet
10/100 Mbps
Ethernet
Switch/
Hub/
Router
4/16 Mbps
Token-Ring
100 Mbps
Token-Ring
Backbone
Switch/
Hub/
Router
Switch /
Router
Server
TCP/IP applications
TN3270 browser
access to SNA appls.
Enterprise Extender
for SNA end points
QDIO Mode - TCP/IP
pSeries, RS/6000
xSeries, Netfinity
Gigabit
Ethernet
Server
Server
Server
IP
Router
IP Router
Remote Office
4/16/100 Mbps
Token-Ring
10/100 Mbps
Ethernet
4/16 Mbps
Token-Ring
IP WAN
Intranet
Internet or
extranet
Gigabit Ethernet
(fiber or copper)
Gigabit Ethernet
(fiber or copper)
10/100 Mbps
Ethernet