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© Copyright IBM Corp. 2001 1
Chapter 1. Introduction
Netfinity/EFS and ThinkPad/EFS systems are entry-level S/390 products. Implementation,
involving underlying PC Server (or ThinkPad) hardware and S/390 emulation software, differs
considerably from earlier machines. The EFS portion of the name is derived from “Enabled
For S/390.”
EFS systems may be used to run OS/390 (and z/OS
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), VM/ESA (and z/VM), VSE/ESA, and
Linux for S/390. They may also be used for older versions of these operating systems. This
document addresses only OS/390 and z/OS (31-bit mode) use, but the reader should not
infer that the EFS is limited to OS/390 and z/OS.
Rather than constantly write “OS/390 and z/OS (31-bit mode)” we tend to simply mention
OS/390 unless there is a particular point to be made about z/OS. You should assume that
this book refers to both OS/390 and z/OS.
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z/OS (31-bit mode) is supported in the latest release for FLEX-ES. Much of the work for this redbook was done
before this latest release was available. We expect no significant differences to the redbook contents if you are using
z/OS.