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.