PowerVM Definitions:

PowerVM Definitions:

CoD - Capacity on Demand. The ability to add compute capacity in the form of CPU or memory to a running system by simply activating it. The resources must be pre-staged in the system prior to use and are (typically) turned on with an activation key. There are several different pricing models for CoD.

DLPAR - Dynamic Logical Partition. This was used originally as a further clarification on the concept of an LPAR as one that can have resources dynamically added or removed. The most popular usage is as a verb; ie: to DLPAR (add) resources to a partition.

HEA - Host Ethernet Adapter. The physical port of the IVE interface on some of the Power 6 systems. A HEA port can be added to a port group and shared amongst LPARs or placed in promiscuous mode and used by a single LPAR (typically a VIOS LPAR).

HMC - Hardware Management Console. An "appliance" server that is used to manage Power 4, 5, and 6 hardware. The primary purpose is to enable / control the virtualization technologies as well as provide call-home functionality, remote console access, and gather operational data.

IVE - Integrated Virtual Ethernet. The capability to provide virtualized Ethernet services to LPARs without the need of VIOS. This functionality was introduced on several Power 6 systems.

IVM - Integrated Virtualization Manager. This is a management interface that installs on top of the VIOS software that provides much of the HMC functionality. It can be used instead of a HMC for some systems. It is the only option for virtualization management on the blades as they cannot have HMC connectivity.

LHEA - Logical Host Ethernet Adapter. The virtual interface of a IVE in a client LPAR. These communicate via a HEA to the outside / physical world.

LPAR - Logical Partition. This is a collection of system resources that can host an operating system. To the operating system this collection of resources appears to be a complete physical system. Some or all the resources on a LPAR may be shared with other LPARs in the physical system.

Lx86 - Additional software that allows x86 Linux binaries to run on Power Linux without recompilation.

MES - Miscellaneous Equipment Specification. This is a change order to a system, typically in the form of an upgrade. A RPO MES is for Record Purposes Only. Both specify to IBM changes that are made to a system.

MSPP - Multiple Shared Processor Pools. This is a Power 6 capability that allows for more than one SPP.

SEA - Shared Ethernet Adapter. This is a VIOS mapping of a physical to a virtual Ethernet adapter. A SEA is used to extend the physical network (from a physical Ethernet switch) into the virtual environment where multiple LPARs can access that network.

SPP - Shared Processor Pool. This is an organizational grouping of CPU resources that allows caps and guaranteed allocations to be set for an entire group of LPARs. Power 5 systems have a single SPP, Power 6 systems can have multiple.

VIOC - Virtual I/O Client. Any LPAR that utilizes VIOS for resources such as disk and network.

VIOS - Virtual I/O Server. The LPAR that owns physical resources and maps them to virtual adapters so VIOC can share those resources.