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z/VM Version 3 (V3)
z/VM offers a new technology base for customers look-
ing to use IBM Virtual Machine technology on one of the
industry’s best-of-breed server platform, zSeries. When
z/VM is running on a zSeries server, it’s possible to run 64-
bit capable OS/390 2.10, z/OS, and Linux on zSeries as
guest systems of z/VM, in addition to ESA/390 guest oper-
ating systems such as OS/390, VSE/ESA, TPF, and Linux
on S/390. To operate z/OS as a guest of z/VM on a zSeries
server, z/VM must be operating in 64-bit mode. z/VM will
allow customers to develop and test their 64-bit Parallel
Sysplex applications in a guest environment before putting
them into production. This may help reduce the need to
invest in separate standalone confi gurations.
z/VM can also reduce storage constraints by eliminating
the 2 GB central storage limitation, providing plenty of
headroom for increasing on demand business require-
ments and growing back-offi ce applications within a single
machine image. Customers experiencing real memory
constraints can experience relief by running z/VM in 64-bit
mode on a zSeries server. This constraint relief is provided
for ESA/390 guest operating systems. Support for large
real memory with z/VM may benefi t customers running a
large number of Linux on zSeries and S/390 guest systems.
Additional enhancements in z/VM V3 include:
• Native FlashCopy for Enterprise Storage Server (ESS) for
high-speed data copy
• Guest support enhancements for 3494 VTS and FICON
attached 3590 A60 Tape Controller
Connectivity enhancements for TCP/IP Feature for z/VM:
• Improved security with the inclusion of a Secure Socket
Layer (SSL) server
• Transparent data access to remote systems data with an
NFS Client
• Capability and usability improvements to FTP server for
Web browsers
• Reduced load on hosts with support for IP Multicasting
• Improved data transfer performance with QDIO support-
ing Gigabit Ethernet, Fast Ethernet, and 155 ATM (Ether-
net LAN Emulation)
• Support for the DFSMS/MVS
®
Program Management
binder and loader functionality to enhance application
affi nity between CMS and OS/390 or z/OS
Note: z/VM V3.1 has been withdrawn from marketing effec-
tive August 27, 2004.
z/VM Version 4 (V4)
With z/VM and the IBM Integrated Facility for Linux (IFL), a
low-cost, fl exible environment is created to test and develop
on Linux while running Linux production applications on
IBM z990, z890, z900, z800, S/390 Parallel Enterprise
Server Generation 5 and 6, S/390 Multiprise 3000, or
equivalent servers. Support for IFL processor features by
z/VM V4 or later is designed to run Linux workloads with-
out increasing the IBM software charges for z/OS, z/OS.e,
OS/390, VM, VSE/ESA, or TPF operating systems and
applications running on standard engines of the z990, z890,
z900, z800, and S/390 servers in other logical partitions.
Engine-based pricing for z/VM V4 and its optional features
allows customers the opportunity to exploit the zSeries
and S/390 servers more cost effectively than a discrete
server implementation. With engine-based pricing, cus-
tomers pay a one-time software license charge (OTC) for
each processor engine. This can be for standard proces-
sor engines or IFL engines. Traditional operating systems
such as z/OS, z/OS.e, OS/390, TPF, VSE/ESA, z/VM V3.1,
or VM/ESA are not supported nor can they operate on IFL
engines. Only Linux workloads in an LPAR or Linux guests
of z/VM V4 or later can operate on the IFL engine.