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Typical of IBM branding, their naming makes no sense and everyone still uses AS/400 to refer to IBM i.

So here's is what I have been able to discern,

Operating System

IBM i refers to the operating system formally called,

  1. OS/400 (original name)
  2. i5/OS (introduced in 1999 with LPARS)

The most versions of IBM i released,

  • 5.4
  • 6.1
  • 7.1

Hardware

In their marketing wisdom, IBM decided to name the hardware platform IBM System i formally called,

  1. AS/400 (originally name introduced in 1988)
  2. eServer iSeries (in 2000)
  3. System i (in 2006)

And to make things more confusing in 2008, the platform was merged with the System p platform (which ran AIX and Linux) into IBM Power Systems.

Confused yet? Even IBM is by their website. Today, many people still refer to the hardware and software as AS/400 or iSeries.

Nutshell

So in a nutshell, the OS is IBM i and the Hardware Platform is IBM Power Systems which can run in LPARs,

  • IBM i (various versions 6.1 and 7.1)
  • Linux (Redhat, hopefully Ubuntu some time)
  • AIX

So Which Operating System is the Host?

I still don't know which OS is the host OS yet.

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