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Nathan,

A Host partition owns some resource, very typically disk but also optical tape or network that it shares with a Guest also known as a Client partition. The Client then is using resources from the Host. In the case where it's Disk that's being shared the Host partition must be running before the Client partitions can be started.

You could call the Host a 'primary' operating system I suppose and back in the AS/400 LPAR days that was the term we used. We don't any longer however because there can be multiple Host partitions on a single POWER Server while in the AS/400 and iSeries days that was not possible, it truly was Primary back then. Today some of the function of the Primary is taken over by the Flexible Service Processor (FSP) and the Hardware Management Console (HMC) or the IVM component of VIOS. The actual Host component is either IBM i or VIOS on POWER.

- Larry "DrFranken" Bolhuis

On 9/8/2012 5:28 PM, Nathan Andelin wrote:
I'd like a clarification of terms. What is a host partition? What is a guest partition. If someone says "Currently it's one hosted and two guested LPARS", what does that mean? What is the difference between "hosted" and "guested"?

Some references suggest that a "guest" runs under the primary operating system, such as Linux running under a Windows VM. Windows is the "host", while Linux is the "guest". If Windows fails to boot, then there would be no way to reach Linux, for example.

-Nathan


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