Hp StorageWorks 2.64 Core Switch Manuel d'utilisateur télécharger pdf (Page 54)

Zoning Concepts and Guidelines

54 Zoning Version 3.1.x/4.1.x User Guide

Storage Area Networks

The storage area network brings the connectivity of networks to the SCSI

protocol. The Fibre Channel standard provides for up to 16 million devices

attached to the network. This change in scale required a new method to discover

the devices on the fabric, so that discovery can be accomplished in an acceptable

time frame.

The fabric well-known service “nameserver” was implemented to address this

need. When a device initially accesses the fabric, it must perform a login process.

During this process the device will register with the nameserver. The nameserver

records information about the device; that is, protocols supported, World Wide

Name (WWN), network address, supported class of service, for example.

When an initiator accesses the network it can query the nameserver for all

attached devices and their capabilities. Any initiator can query (probe) the fabric

for all targets, and then proceed to initialize the targets and perform I/O. This can

be disastrous if another initiator is already utilizing the target and has stored data

on it such as with a disk or tape. The process of zoning is utilized to provide a

virtual SCSI bus that limits the devices that an initiator can discover and access.

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Hp StorageWorks 2.64 Core Switch Manuel d'utilisateur Page 54