Enterprise Volume Manager (Multi-OS) Version 2.0D Network Administration Guide

Enterprise Volume Manager (Multi-OS) Network Administration Guide Glossary–3
Glossary
demand allocated snapshot
A point-in-time copy of a specified virtual disk (LUN). The HSV controller initially allocates
only a small amount of space for the snapshot disk, just enough to store point-in-time
information and pointers to data on the source. As data on the source is overwritten, the
controller increases the allocated space for the snapshot and copies the original (point-in-time)
data from the source to the snapshot. If all of the original data on the source is overwritten, the
controller will have increased the allocated space on the snapshot by an amount equal to the
full size of the source.
device
A hardware unit such as a computer, disk, tape, router, hub, or adapter that can be attached to a
host or network.
Element Manager
A Web-based storage environment manager that enables users to configure and monitor HSG
and HSV controllers. The element manager resides on the HP OpenView Management
Appliance.
EVM network
A network that consists of EVM-enabled computers that are connected to a common LAN and
to EVM-compatible StorageWorks storage systems.
Fibre Channel
A high-speed, serial bus technology that supports channel and network architectures and a
variety of transmission media and protocols. Fibre Channel Arbitrated Loop (FC-AL) is a
standard designed for mass storage and other peripheral devices. FC-AL uses optical fiber to
achieve transfer rates up to one GB per second.
fully allocated snapshot
See snapshot.
host
In StorageWorks, the controlling computer to which a storage system is attached.