Users Guide

8 Overview
Terminology Used in This Document
This document uses the terms logical unit number (LUN) and virtual disk.
These terms are synonymous and can be used interchangeably. The term
LUN is commonly used in a Dell/EMC Fibre Channel storage system
environment and virtual disk is commonly used in a Dell PowerVault SAS
or iSCSI (Dell PowerVault MD3000 and Dell PowerVault MD3000i with
Dell PowerVault MD1000 expansion) storage environment.
Dell EqualLogic PS series storage arrays include storage virtualization
technology. To better understand how these arrays operate, it is helpful to be
familiar with some of the terminologies used to describe these arrays and
their functions:
• Member —A single PS series array.
• Group —A set of one or more members that can be centrally managed.
Host servers access the data through a single group IP address.
• Pool —A RAID that can consist of the disks from one or more members.
• Volume —A LUN or virtual disk that represents a subset of the capacity of
a pool.