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iSeries

iSeries. Note3. Technology independence. Technology independence  change the underlying hardware architecture and add new functionality without disrupting customers.

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iSeries

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  1. iSeries Note3

  2. Technology independence • Technology independence  change the underlying hardware architecture and add new functionality without disrupting customers. • Other manufacturers found ways to incorporate new functions and new hardware designs. Difference  existing application programs cannot use these new capabilities. • Intel [1985]  added 32-bit extensions to the original 16-bit architecture. • Any 16-bit application could still run on the new 32-bit chips, but it ran in a 16-bit mode that did not use any of the 32-bit extensions. • Intel [1997] made a significant change to the architecture when it added the multimedia extension (MMX). • Older applications could run on the new chips but just couldn't use MMX. • PC industry  acceptable to require applications to be rewritten to use the newest hardware functionality

  3. iSeries architecture Data Structure Internal details are hidden [encapsulation] Object

  4. Conventional Machine Interface

  5. iSeries MI Note: There is no memory at the MI

  6. The iSeries' operating system  OS/400 [MI] + SLIC The System Licensed Internal Code [Kernel]

  7. Operating System Functional Split System-wide security is in OS/400, while the authorization to system resources is in the SLIC

  8. Technology-Independent Machine Interface

  9. Objects • how the iSeries uses objects . • iSeries is an object-based system [no inheritance] • This permits only iSeries servers to make technology advances in the hardware, such as storage, memory, and processor technology, while protecting end-users' investments in existing applications

  10. Object-based system

  11. Logical partitions and many operating systems iSeries is the universal server. • OS/400 • Linux • Unix, • Windows applications all run on iSeries servers. A single server may optionally be divided into several partitions, each of which receives a dedicated set of resources, including processor and memory.  The primary partition must be OS/400, but the other partitions can run, as of this writing, different versions of OS/400 and Linux. 

  12. Logical partitions and many operating systems (cont.) • Linux distributions, provided by several vendors, run in logical partition(s) of an iSeries server. • Windows applications run on an iSeries server on an optional plug-in Intel processor. • Rather than run an instance of a Unix operating system, applications from AIX run inside an OS/400 job, completely and seamlessly integrated into OS/400. • This option is the OS/400 Portable Application Solution Environment (OS/400 PASE). PASE provides a very easy way to drop in, often unmodified, a Unix application on iSeries.

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