HP UX vPars and Integrity VM v6 manual Glossary, components, addressing scheme

Glossary

	The following terms are commonly used to discuss VM Manager and its integrated
	components:
Accelerated Virtual	See AVIO.
Input/Output
agent	A program that regularly gathers information or performs some other service without the user's
	immediate presence. Matrix Operating Environment for HP-UX relies on agents on managed
	systems to provide in-depth hardware and software information.
agile addressing	Supported on Integrity VM running HP-UX 11i v3, a storage device addressing model that
	addresses a logical unit (referred to as LUN, this is the logical device that refers to the physical
	storage device) by using the same device special file (DSF) regardless of the location of the LUN.
	The addressing model uses a worldwide device identifier (WWID) to uniquely identify LUNs. The
	WWID is a device attribute that is independent of the device’s location in a SAN or in an
	adapter/controller access path. With a multipath device, the WWID allows one persistent DSF
	and one LUN hardware path to represent the device, regardless of the number of legacy hardware
	paths. Therefore, an agile device address remains the same (is persistent) when changes are
	made to the access path. Likewise, if additional paths are offered to a given LUN (by adding a
	new SCSI controller or new SCSI target paths), the DSF is unaffected: no new DSFs need be
	provided. This model enables VM Manager to display one DSF for each multipath device instead
	of displaying a separate DSF for each path to the device (as done when using the legacy
	addressing scheme).
	See also legacy addressing.
APA	Automatic Port Aggregation. A combination of LAN ports that can be accessed through a single
	interface name. An APA creates link aggregates (often called trunks) that provide a logical
	grouping of two or more physical ports into a single “fat pipe.” This port arrangement provides
	more data bandwidth and higher reliability than would otherwise be available.
AVIO	Accelerated Virtual Input/Output. An I/O protocol that improves virtual I/O performance for
	network and storage devices used within the Integrity VM environment. The protocol also enables
	support for a greater number of virtual I/O devices per guest. For each virtual machine containing
	an AVIO device, the VM Host OS and the guest OS must support AVIO.
backing device	Backing store. The physical device (such as a network adapter, a disk, or a file) on the VM Host
	that is allocated to guests.
cluster	Two or more systems configured together to host workloads. Users are unaware that more than
	one system is hosting the workload.
core	The actual data-processing engine within a processor. A single processor might have multiple
	cores, and a core might support multiple execution threads. A virtual processor core in a virtual
	machine is also called a virtual CPU or vCPU.
	See also processor.
dedicated vswitch	A vswitch that is dedicated to use by a certain virtual machine. This type of vswitch cannot be
	shared by multiple virtual machines running at the same time.
EFI	Extensible Firmware Interface. The system firmware user interface that allows boot-related
	configuration changes and operations on Itanium-based systems. For example, EFI provides ways
	to specify boot options and list boot devices.
entitlement	The amount of a system resource (for example, processor resources) that is guaranteed to a virtual
	machine. The actual allocation of resources to the virtual machine can be greater or less than its
	entitlement, depending on the virtual machine's demand for processor resources and the overall
	system processor load.
entitlement cap	The maximum amount of computing power allotted to a virtual machine for each vCPU.
guest	The virtual machine running the guest OS and guest applications.
guest OS	Guest operating system.

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