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Note: OSA-Express 155 ATM and OSA-2 FDDI are no
longer supported. If ATM or FDDI support are still required,
a multiprotocol switch or router with the appropriate net-
work interface for example, 1000BASE-T Ethernet, GbE LX
or GbE SX can be used to provide connectivity between
the LAN and the ATM network or FDDI LAN.
Server to User connections
A key strength of OSA-Express and associated Com-
munications Server protocol support is the ability to
accommodate the customer’s attachment requirements,
spanning combinations of TCP/IP and SNA applications
and devices. Customers can use TCP/IP connections from
the remote site to either their TCP/IP or SNA applications
on zSeries and S/390 by confi guring OSA-Express with
QDIO and using either direct TCP/IP access or appropriate
SNA to IP integration technologies, such as TN3270 Server
and Enterprise Extender for access to SNA applications.
Customers who require the use of native SNA-based con-
nections from the remote site can use a TCP/IP or SNA
transport to the data center and then connect into zSeries
and S/390 using appropriate SNA support on OSA-Express
features confi gured in non-QDIO mode.
LPAR Support of OSA-Express
For z890 customers or customers who use the Processor
Resource/Systems Manager (PR/SM) capabilities of the z800,
z900 and the S/390 servers, IBM offers the Multiple Image
Facility (MIF), allowing the sharing of physical channels by
any number of LPARs. Since a port on an OSA-Express fea-
ture 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 nition (HCD). Depending upon the feature,
and how it is defi ned, SNA/APPN/HPR and TCP/IP traffi c can
fl ow simultaneously 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 5.1, and z/OS 1.4 and later.
Performance enhancements for virtual servers
Two important networking technology advancements are
announced in z/VM 4.4 and Linux on z990.
• The high performance adapter interrupt handling fi rst
introduced with HiperSockets is now available for OSA-
Express/OSA-Express2 in QDIO mode (CHPID=OSD)
and FICON Express/FICON Express2 (CHPID=FCP).
This advancement provides a 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.
• z990/z890 support of virtual machine technology has
been enhanced to include a new performance assist
for virtualization of adapter interruptions. This new z890/
z990 performance assist is available to V=V guests
(pageable guests) that support QDIO on z/VM 4.4 and
later. The deployment of adapter interruptions improves
effi ciency and performance by reducing z/VM Control
Program overhead.
OSA-Express2 large send for the z/OS environment –
preview
Previewing large send for TCP/IP traffi c
z/OS Communications Server plans to exploit OSA-
Express2 large send (also referred to as TCP segmentation