VMware vSphere 4 Technical Information download pdf (Page 45)

VMware, Inc. 45

Glossary

iSCSI

A protocol allowing SCSI commands to be transmitted over TCP/IP (typically using ordinary Ethernet

cabling). An iSCSI client is called an initiator (can be software or hardware); an iSCSI server is called a

target.

J Jumbo frames

Ethernet frames with a payload of more than 1,500 bytes. Because there is a CPU cost per network packet,

larger packets can reduce the CPU cost of network traffic. Not all Gigabit Ethernet cards or switches

support jumbo frames. Jumbo frames are supported by the Enhanced VMXNET and the VMXNET3

virtual network adapters (but not by the normal VMXNET adapter).

K Kernel

The heart of an operating system. The kernel usually includes the functionality of a Hardware Abstraction

Layer (HAL). Though applying to any operating system, the term is more often used in reference to Linux

than to Windows.

L Large Pages

A feature offered by most modern processors allowing the TLB (translation lookaside buffer) to index

2MB or 4MB pages in addition to the standard 4KB pages.

Linked Clone

A copy of the original virtual machine that must have access to the parent virtual machine’s virtual disk(s).

The linked clone stores changes to the virtual disk(s) in a set of files separate from the parent’s virtual disk

files. See also Full Clone.

LUN (Logical Unit Number)

A number identifying a single logical unit, can represent a single disk or a partition on an array. Used in

many storage technologies, including SCSI, iSCSI, and Fibre Channel.

M Management User Interface (MUI)

A web-based interface to previous versions of ESX Server. For ESX Server 3.0 and later the functionality

of the MUI has largely been replaced by the Virtual Infrastructure Client (VI Client) and the vSphere

Client.

MMU (Memory Management Unit)

Part of a computer’s hardware that acts as an interface between the core of the CPU and main memory.

Typically part of the CPU package in modern processors.

N NAS

See Network Attached Storage.

Native Execution

Execution of an application directly on a physical server, as contrasted with running the application in a

virtual machine.

Native System

A computer running a single operating system, and in which the applications run directly in that

operating system.

Network-Attached Storage (NAS)

A storage system connected to a computer network. NAS systems are file-based, and often use TCP/IP

over Ethernet (although there are numerous other variations). See also Storage Area Network.

Network File System (NFS)

A specific network file system protocol supported by many storage devices and operating systems.

Traditionally implemented over a standard LAN (as opposed to a dedicated storage network).

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