HP XP P9500 Storage - Manual (Page 3)

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 ®