HP Hitachi Dynamic Link Manager Software - Manual (Page 15)

xi
Contents
Preface i
Intended readers .........................................................................................................i
Organization of this manual .......................................................................................i
Related Publications..................................................................................................ii
Conventions: Abbreviations.................................................................................... iii
Conventions: Diagrams ...........................................................................................vii
Conventions: Fonts and symbols.............................................................................vii
Conventions: KB, MB, GB, and TB ........................................................................ix
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
2.3 LU Configuration .......................................................................................................9
2.4 Program Configuration .............................................................................................11
2.5 Position of the HDLM Driver and HDLM Device...................................................13
2.6 Logical Device Files for HDLM Devices.................................................................14
2.7 Distributing a Load Using Load Balancing..............................................................16
2.7.1 Paths to Which Load Balancing Is Applied ..................................................18
2.7.2 Load Balancing Algorithms ..........................................................................20
2.8 Performing Failovers and Failbacks Using Path Switching .....................................23
2.8.1 Automatic Path Switching.............................................................................23
2.8.2 Manual Path Switching .................................................................................26
2.8.3 Path Status Transition....................................................................................27
2.9 Intermittent Error Monitoring (Functionality When Automatic Failback Is Used) .30
2.9.1 Checking Intermittent Errors.........................................................................30
2.9.2 Setting Up Intermittent Error Monitoring .....................................................30
2.9.3 Intermittent Error Monitoring Actions..........................................................31
2.9.4 When a User Changes the Intermittent Error Information...........................33
2.10 Detecting Errors by Using Path Health Checking ..................................................36
2.11 Error Management ..................................................................................................37
2.11.1 Types of Collected Logs..............................................................................39
2.11.2 Filtering of Error Information .....................................................................40
2.11.3 Collecting Error Information Using the Utility for Collecting HDLM Error
Information (DLMgetras) .............................................................................41