Service Guide

Glossary

D

data port

Ethernet ports used for storag-traffic and configuration purposes.

domain name server

In the Internet suite of protocols, the distributed database system used to map domain names to IP addresses.

DNS

See domain name server.

F

free disk

A physical disk that is not assigned as a hot-spare, standby hot-spare, or to a logical drive.

FTP

file transfer protocol.

H

hot-spare disk

A physical disk that is automatically mapped to a logical drive if one of the logical drive's disks goes offline.

I

IDE

integrated development environment.

iLUN

iSCSI client logical-unit number.

iSCSI

A technology that allows the SCSI transport protocol over an IP network by connecting clients (initiators) and servers to storage.

iSCSI client

A device that creates and sends SCSI commands to the target IBM IP Storage appliance.

iSCSI client logical-unit number (iLUN)

A unique number that is assigned to each VLUN. The iLUN for a single client starts at zero and increments sequentially.

L

logical drive

A unit of virtual storage that is made available to the network through VLUNs and iLUNs. It is made up of one or more physical disks that are combined using RAID 0, 1, 1E, 5, or 5E technology.

R

RAID

Redundant array of independent disks.

S

SCSI

See small computer system interface.

small computer system interface (SCSI)

A standard hardware interface that enables a variety of peripheral devices to communicate with one another.

standby hot-spare disk

A physical disk that is automatically mapped to a logical drive when no suitable hot-spare disk is available.

T

target

A collection of logical units that are directly addressable on the network. The target corresponds to the server in a client-server model.

V

VLUN

See virtual logical unit.

virtual logical unit (VLUN)

A subset of a logical drive.