HP Integrity Virtual Machines (Integrity VM) is a soft partitioning
and virtualization technology that enables you to create multiple
software-controlled Itanium®-based virtual machines within a single HP Integrity server or nPartition.
The Integrity server or nPartition acts as a VM Host for the virtual
machines (virtual machines are also called guests). The VM Host is
a platform manager. It manages
hardware resources such as memory, CPU allocation, and I/O devices,
and shares them among multiple virtual machines. The VM Host runs
a version of the HP-UX operating system and can be managed using standard
HP-UX management tools.
The virtual machines share a single set
of physical hardware resources, yet each virtual machine is a complete
environment in itself and runs its own instance of an operating system
(called a guest OS). As with a real machine, the virtual machine contains:
At least one processor core, also referred to as a
virtual CPU or vCPU
Other components of a computer
All these elements are
virtual, meaning that they are at least partially emulated in software
rather than fully implemented in hardware; however, to the guest
OS they appear as if they are real, physical components.
No guest OS can access memory allocated to another
guest OS. One virtual machine is not affected by software events on
another virtual machine, such as faults or planned software downtimes.
Integrity VM optimizes the utilization of hardware resources, quickly
allocating resources such as processor cores, memory, or I/O bandwidth
to the virtual machines as needed. Any software that runs on supported
versions of HP-UX can run in an Integrity VM virtual machine. No
recompiling, recertification, or changes are required for applications
to run in a guest OS. Applications run in the guest OS as they do
on any operating system.
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