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1
Overview of HDLM
HDLM is a software package that manages paths between a host and a
storage system. HDLM is designed to distribute loads across multiple paths
and will switch a given load to another path if there is a failure in the path
that is currently being used, thus improving system reliability.
This chapter gives an overview of HDLM and describes its features.
□
What is HDLM?
□
HDLM Features
Overview of HDLM
1-1
Hitachi Dynamic Link Manager User Guide for AIX
®
- Dynamic Link Manager Software 1
- Contents 3
- Acronyms and abbreviations 11
- Glossary 11
- Intended audience 14
- Product version 14
- Release notes 14
- Document revision level 14
- Document organization 15
- Related documents 15
- Document conventions 16
- Getting help 17
- Comments 17
- Data Systems Corporation 18
- Thank you! 18
- Overview of HDLM 19
- What is HDLM? 20
- HDLM Features 20
- HDLM Functions 23
- Cluster support 24
- Devices Managed by HDLM 25
- System Configuration 25
- Components Description 26
- LU Configuration 27
- Program Configuration 28
- Program name Functions 29
- Load Balancing Algorithms 34
- Automatic path switching 36
- Figure 2-8 Path switching 37
- Automatic failbacks 40
- Manual path switching 41
- Path status transition 42
- Status transitions of a path 43
- Checking intermittent errors 46
- Monitoring 49
- Function 52
- Error management 53
- Types of Collected Logs 54
- Table 2-8 Error levels 55
- Collecting Audit Log Data 57
- Category Explanation 58
- Audit Log Data Formats 63
- Explanation 64
- HDLM System Requirements 69
- OS Kernel 70
- # lslpp -L xlC.aix50.rte 70
- Storage Systems 71
- OS Related Programs 72
- Configurations 73
- Memory Requirements 76
- Disk Capacity Requirements 76
- Item Supported number 77
- Types of HDLM Installation 78
- Notes on Installing HDLM 79
- Notes on a License Key 81
- Notes on Trace Files 81
- Notes on Storage Systems 82
- Notes on the Cluster 82
- Installing HDLM 83
- Environments 85
- Set Up the Hardware 89
- Switch the Kernel Mode 90
- Set Up Cluster Software 91
- # lsdev -Cc disk 92
- # umount /cdrom 98
- # rm -r /cdrom 98
- # shutdown -Fr 98
- Stop Applications 102
- File Description 103
- Creating an HDLM Environment 103
- Disk Environment) 126
- Environment) 126
- . Insert the DVD-ROM 131
- . Unmount the DVD-ROM 133
- . Mount the DVD-ROM 135
- Setting up HDLM 139
- Checking the Current Settings 140
- Setting Up the HDLM Functions 140
- Setting Up Load Balancing 141
- Setting the Trace Level 145
- Setting the Trace File Size 146
- Value (severity) Explanation 147
- Value Explanation 147
- Checking the Updated Settings 148
- Setting up Integrated Traces 149
- Settings 150
- Interval 153
- About the Reservation Policy 156
- Settings for Using PowerHA 157
- Settings for Using GPFS 159
- Settings for Using VCS 162
- Removing HDLM 163
- HDLM Operation 173
- Notes on Using HDLM 174
- Storage System 175
- Notes on Shutting Down a Host 175
- Notes on Errors in a Host 175
- Viewed From the Same Server 176
- Environment 176
- Notes on Replicating a System 177
- Notes on Using Commands 177
- Viewing Path Information 177
- Changing the Status of Paths 178
- Viewing LU Information 180
- Path IDs, and LDEVs 180
- Viewing License Information 183
- Updating the License 184
- Starting the HDLM Manager 186
- Stopping the HDLM Manager 186
- HDLM Resident Processes 187
- Changing hdisk attributes 189
- Changing a Path 193
- . Delete the path 194
- Replacing an HBA 195
- # cfgmgr -l fcsn 198
- Available hdisk10 fscsi1 199
- Replacing a Fiber Cable 200
- Troubleshooting 205
- What To Do for a Path Error 207
- Examining the Messages 210
- Obtaining Program Information 210
- What To Do for Other Errors 211
- Command Reference 213
- Command format 214
- Parameters 215
- Parameter 216
- Reference 223
- Value Description 232
- Table 6-4 Trace Level Values 233
- Table 6-6 License Key Types 240
- To Display Path Information 245
- To display path information 245
- [[slpr] [vg] 246
- Examples 252
- Displayed path information 259
- -: Not displayed 263
- number (the xx part 264
- To Display LU Information 266
- To display LU information 266
- Example 2 269
- Displayed LU information 271
- Item Description 278
- Utility Reference 285
- Overview of the Utilities 287
- Time of the Utilities 289
- Output directory 293
- Files Explanation 293
- Supplemental Information: 297
- Information 300
- Environment ODM 305
- [ODM_SETTINGS] section 320
- Log file 326
- Messages 329
- Format Meaning 331
- Terms Meaning 331
- KAPL01001 to KAPL02000 332
- Message Text Explanation 333
- KAPL03001 to KAPL04000 363
- KAPL04001 to KAPL05000 365
- KAPL05001 to KAPL06000 375
- KAPL06001 to KAPL07000 379
- KAPL07001 to KAPL08000 382
- KAPL08001 to KAPL09000 383
- KAPL09001 to KAPL10000 387
- KAPL10001 to KAPL11000 413
- . Check whether you 416
- . Check whether the 416
- . Check that the disk 416
- KAPL11001 to KAPL12000 439
- KAPL13001 to KAPL14000 443
- KAPL15001 to KAPL16000 456
- Component 460
- Message ID Explanation 461
- Versions of HDLM 465
- Add-in HDLM Driver Module 468
- Commands of the utilities for 469
- Corresponding AIX commands 469
- 0: Ignoring the reservation 471
- 2: Persistent reservation 471
- PR_exclusive 471
- Virtual SCSI Disks 472
- Acronyms-2 474
- Acronyms-3 475
- Acronyms-4 476
- Acronyms-5 477
- Acronyms-6 478
- Glossary-2 480
- Glossary-3 481
- Glossary-4 482
- Glossary-5 483
- Glossary-6 484
- Glossary-7 485
- Glossary-8 486
- MK-92DLM111-27 494
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