Hitachi Dynamic Link Manager, User Manual

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Contents
Preface
i
Intended Readers ........................................................................................................i
Organization of This Manual .....................................................................................i
Related Publications..................................................................................................ii
Conventions: Abbreviations.................................................................................... iii
Conventions: Diagrams ............................................................................................ix
Conventions: Fonts and Symbols.............................................................................ix
Conventions: KB, MB, GB, and TB ........................................................................xi
1. Overview of HDLM
1
1.1 What is HDLM? .........................................................................................................2
1.2 HDLM Features..........................................................................................................4
2. HDLM Functions
5
2.1 Devices Managed by HDLM......................................................................................6
2.2 System Configuration.................................................................................................7
2.2.1 System Configuration Using an FC-SAN .......................................................7
2.2.2 System Configuration Using an IP-SAN ........................................................9
2.3 LU Configuration .....................................................................................................12
2.4 Program Configuration .............................................................................................14
2.5 Position of the HDLM Driver and HDLM Device...................................................16
2.6 Logical Device Files for HDLM Devices.................................................................17
2.7 Distributing a Load Using Load Balancing..............................................................19
2.7.1 Paths To Which Load Balancing Is Applied .................................................21
2.7.2 Load Balancing Algorithms ..........................................................................23
2.8 Performing Failovers and Failbacks Using Path Switching .....................................25
2.8.1 Automatic Path Switching.............................................................................25
2.8.2 Manual Path Switching .................................................................................28
2.8.3 Path Status Transition....................................................................................29
2.9 Monitoring Intermittent Errors (Functionality When Automatic Failback Is Used) 32
2.9.1 Checking Intermittent Errors.........................................................................32
2.9.2 Setting Up Intermittent Error Monitoring .....................................................32
2.9.3 Intermittent Error Monitoring Actions..........................................................33
2.9.4 When a User Changes the Intermittent Error Information...........................35
2.10 Detecting Errors by Using Path Health Checking ..................................................38
2.11 Error Management ..................................................................................................39
2.11.1 Types of Collected Logs..............................................................................41
2.11.2 Filtering of Error Information .....................................................................42