Download Document

• Linux on System z
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z
'Linux on System z' is the collective
term for the Linux Operating System
compiled to run on IBM mainframes,
especially System z machines. Other
terms with the same meaning include
'Linux on zEnterprise 196', 'Linux on
System z10', 'Linux on System z9',
'Linux on zSeries', 'Linux/390', 'zLinux',
'z/Linux', etc.
1
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - History
1
IBM published a collection of patches
and additions to the Linux 2.2.13
Kernel (computer science)|kernel on
December 18, 1999, to start today's
mainline Linux on System z
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - History
1
At the start of IBM's involvement, Linux
patches for System z included some
object code only (OCO) modules,
without source code. However,
currently Linux on System z is
completely free software under the
GNU General Public License.
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Hardware
1
Linux on System z is available in both 31bit and 64-bit versions. The Linux kernel
architecture designation is s390 for 31-bit
kernels and s390'x' for 64-bit kernels. 64bit distributions can still run 31-bit
applications. The 31-bit versions are
rapidly losing favor as z/Architecture
mainframes become more prevalent than
the earlier ESA/390 generation.
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Advantages
1
Linux on System z gives the flexibility of running
Linux with the advantages of mainframe hardware
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Pricing and costs
1
Thus, beyond some minimum threshold,
Linux on System z can quickly become
cost-advantageous when factoring in labor
and software costs.
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Pricing and costs
1
Server centralization, as Linux on System
z provides, might reward cooperation with
better service and lower costs, but that's
not to say that cooperation is always easily
accomplished within a corporate
bureaucracy.
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Pricing and costs
Linux on System z also supports less
expensive disk storage devices than
z/OS because Linux does not require
FICON or ESCON attachment, although
z/OS may use disk space more
efficiently due to hardware-assisted
database compression on z/OS. This
compression effect is somewhat variable
and may be somewhat reduced due to
the minimum space allocation
requirements for z/OS data set (IBM
mainframe)|data sets (a full disk track).
1
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Appropriate workloads
1
On the other hand, mainframes in
general, and Linux on System z in
particular, do not perform well for
single task computations
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Support
1
Like all other versions of Linux, Linux
on System z is governed by the GPL
free software license. Complete Linux
on System z source code is available
from numerous groups on a free and
equal basis, and architectural support
is now part of the main Linux kernel
effort. IBM assigns several of its
programmers to the community
effort, but IBM is by no means the
only participant.
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Support
IBM currently supports two Linux
distributions, Red Hat Enterprise
Linux|Red Hat and SUSE Linux
Enterprise Server|SUSE. Other notable
Linux on System z distributions are
Debian, Gentoo Linux|Gentoo and
Fedora (Operating System)|Fedora.
1
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Support
Nearly every free or open-source
software package available for Linux
generally is available for Linux on
System z, including Apache HTTP
Server, Samba software, JBoss,
PostgreSQL, MySQL, PHP, Python
(programming language)|Python
programming language, Concurrent
Versions System (CVS), GNU Compiler
Collection (GCC), and Perl, among
many others.
1
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Support
1
Red Hat and SUSE offer mainline support for
their distributions running Linux on System z.
IBM Global Services also offers support
contracts, including 24x7 coverage. Some
standard Linux software applications are
readily available pre-compiled, including
popular closed-source enterprise software
packages such as WebSphere, IBM
DB2|DB2 and Oracle database|Oracle
databases and applications, SAP R/3, SAP
ERP, and IBM's Java (programming
language)|Java Developer's Kit (JDK), to
name only a few.
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Developer resources
1
* The Linux Test Drive, a free program
granting a single Linux on System z
virtual machine for 30 days.
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Developer resources
* The Community Development
System for Linux on System z (CDSL)
program, a platform for providing
open source developers a platform for
porting to Linux on System z.
1
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Developer resources
1
Linux on System z supports Unicode
and ASCII just like any other Linux
distributionmdash;it is not an
EBCDIC-based Operating System.
Linux is able to read kernel
parameters in EBCDIC; this ability is
used in z/VM installations.
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Developer resources
Porting Linux applications to Linux on
System z is fairly straightforward; issues
include endianness (Linux on System z is
big-endian) and conversion between 32-bit
integers and 31-bit pointers on the s390
architecture.
1
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Emulators
1
* The open source Hercules emulator
supports Linux on System z (and can
even run on Linux on System z itself).
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
Linux on System z - Emulators
* In 2010, IBM introduced the Rational
Developer for System z Unit Test Feature,
which provides a restricted use execution
environment that can run on X86 hardware.
IBM's license terms limit use of the Unit Test
Feature to certain application development
tasks, not including final pre-production
compiling or pre-production testing (such as
stress testing). The Unit Test Feature
includes z/OS (with common middleware)
and is also compatible with Linux on System
z.
1
https://store.theartofservice.com/the-linux-on-system-z-toolkit.html
For More Information, Visit:
• https://store.theartofservice.co
m/the-linux-on-system-ztoolkit.html
The Art of Service
https://store.theartofservice.com