Administrator Guide

Table Of Contents

host bus adapter (HBA)

An I/O adapter that manages the transfer of information between the host computers bus and memory system. The adapter

performs many low-level interface functions automatically or with minimal processor involvement to minimize the impact on the

host processors performance.

infiniband

A networking standard used for passing data between and among computers. The VS6 hardware uses this protocol for the

intra-cluster communication.

input/output (I/O)

Any operation, program, or device that transfers data to or from a computer.

internet Fibre Channel protocol (iFCP)

Connects Fibre Channel storage devices to SANs or the Internet in geographically distributed systems using TCP.

internet small computer system interface (iSCSI)

A protocol that allows commands to travel through IP networks, which carries data from storage units to servers anywhere in a

computer network.

intranet

A network operating like the World Wide Web but with access restricted to a limited group of authorized users.

Journal volumes

Volumes that contain data waiting to be distributed to target replica volumes and copies of the data previously distributed to the

target volumes. Journal volumes allow convenient rollback to any point in time, enabling instantaneous recovery for application

environments.

kilobit (Kb)

1,024 (2^10) bits. Often rounded to 10^3.

kilobyte (KB)

1,024 (2^10) bytes. Often rounded to 10^3.

latency

Amount of time required to fulfill an I/O request.

LDAP

Lightweight Directory Access Protocol, an application protocol that accesses and maintains distributed directory information

services over an IP network.

load balancing

Distributing the processing and communications activity evenly across a system or network so that no single device is

overwhelmed. Load balancing is especially important when the number of I/O requests issued is unpredictable.

local area network (LAN)

A group of computers and associated devices that share a common communications line and typically share the resources of a

single processor or server within a small geographic area.

Glossary