Hitachi Dynamic Link Manager Software Users Guide for Solaris (7.6)

Contents

Preface.................................................................................................xiii

Intended audience...................................................................................................xiv

Product version.......................................................................................................xiv

Release notes..........................................................................................................xiv

Document revision level...........................................................................................xiv

Document organization............................................................................................xiv

Related documents...................................................................................................xv

Document conventions.............................................................................................xvi

Conventions for storage capacity values....................................................................xvi

Accessing product documentation............................................................................xvii

Getting help...........................................................................................................xvii

Comments..............................................................................................................xvii

1 Overview of HDLM................................................................................1-1

What is HDLM?.......................................................................................................1-2

HDLM Features.......................................................................................................1-2

2 HDLM Functions...................................................................................2-1

Devices Managed by HDLM......................................................................................2-3

System Configuration..............................................................................................2-3

LU Configuration.....................................................................................................2-5

Program Configuration............................................................................................2-6

Position of the HDLM Driver and HDLM Device..........................................................2-8

Logical Device Files for HDLM Devices......................................................................2-9

Distributing a Load Using Load Balancing................................................................2-10

Paths to Which Load Balancing Is Applied.........................................................2-12

When Using the Thunder 9500V Series, or Hitachi AMS/WMS series..........2-12

When Using Other Than the Thunder 9500V Series and Hitachi AMS/WMS

Series...................................................................................................2-13

Load Balancing Algorithms...............................................................................2-14

Performing Failovers and Failbacks Using Path Switching.........................................2-15

Automatic Path Switching................................................................................2-16

Automatic Failovers...............................................................................2-16

Automatic Failbacks...............................................................................2-18

Manual Path Switching....................................................................................2-18

iii

Hitachi Dynamic Link Manager User Guide for Solaris