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20 Chapter 2 HDLM Functions
2.6 Load Distribution using Load Balancing
When the system contains multiple paths to an LU, HDLM can distribute the load across the
paths by using multiple paths for I/O. This functionality is called load balancing, and it
prevents a heavily loaded path from affecting the performance of the entire system.
Note that some I/O operations managed by HDLM can be distributed to each path, while
others cannot. Therefore, even when the load balancing function is used, I/O operations
may not be equally allocated to each path. For example, when Raid Manager issues IOCTL to
a command device, this I/O operation cannot be equally allocated to each path.
Note: Do not use the load balancing function set up in the Microsoft iSCSI Software Initiator
user interface.
In a cluster environment, the load balancing function is only available for TagmaStore,
Thunder 9200/9500V Series, Lightning 9900/9900V Series, and Universal Storage Platform V.
In a non-cluster environment, the load balancing function is available for TagmaStore,
Thunder 9200/9500V Series, Lightning 9900/9900V Series, Universal Storage Platform V, and
the EMC DMX series. For details on the cluster software supported by HDLM, see section
2.12.
Figure 2.7 shows the I/O flow when the load balancing function is not being used. Figure 2.8
shows the I/O flow when the load balancing function is being used. Both figures show an
example of an I/O operation being issued for the same LU from multiple applications.
- MK-92DLM129-13 1
- Trademarks 3
- Notice of Export Controls 4
- Document Revision Level 4
- Preface 5
- Referenced Documents 6
- Comments 6
- Contents 7
- List of Figures 14
- List of Tables 15
- Chapter 1 Overview of HDLM 17
- 1.1 What is HDLM? 18
- HiCommand 19
- Systems User’s Guide 3 19
- EMC CX series 19
- HP EVA series 19
- 1.2 HDLM Features 20
- 1.3 HDLM GUI Overview 21
- 1.3.3 About the Help Window 23
- Chapter 2 HDLM Functions 25
- 2.1 Devices Managed by HDLM 26
- 2.2 System Configuration 27
- IP addresses 30
- Other settings 30
- 2.3 LU Configuration 31
- 2.4 Program Configuration 33
- Universal Storage Platform V 40
- Systems User’s Guide 25 41
- 2.7.1.1 Automatic Failover 43
- 2.7.1.2 Automatic Failback 45
- 2.7.2 Manual Path Switching 46
- 2.11 Error Management 59
- 2.11.1 Collected Logs 60
- 2.12 Cluster Support 64
- >dlnkmgr view -sys –sfunc 65
- 3.1 System Requirements 68
- 3.1.1 Applicable Models 68
- 3.1.1.1 Applicable Hosts 68
- Systems User’s Guide 53 69
- 3.1.3 Related Programs 70
- 3.1.3.4 Using the HDLM GUI 71
- 3.1.4.1 Memory Requirements 71
- 3.1.4.2 Disk Requirements 72
- 3.3 HDLM Installation Types 74
- 3.4.4 Notes on Windows 77
- 3.5 Setting up HDLM 82
- Systems User’s Guide 67 83
- Figure 3.2 Options Window 83
- >dlnkmgr set -elfs 1000 92
- >dlnkmgr set -elfn 5 93
- >dlnkmgr set -systfs 2000 94
- >dlnkmgr set -systfn 10 95
- 3.6 Installing HDLM 97
- Log files 99
- Notes on installation 99
- Legend: 100
- 3.6.2.3 Log file 101
- :\hdlm_license 102
- Entering the license key 123
- 3.6.6 Installing JRE 125
- :\Program 128
- 3.9 Uninstalling HDLM 130
- 3.9.3 Uninstalling HDLM 131
- Chapter 4 HDLM Operation 139
- Source: mpio 140
- Event ID: 20 140
- Disaster Recovery Facility 141
- 4.3.8 Updating the License 160
- -xx yyyy/mm/dd hh:mm:ss 161
- Intentional Path Deletion 173
- Chapter 5 Troubleshooting 177
- AutoPATH_IDs are re 180
- >dlnkmgr online 186
- Chapter 6 GUI Reference 193
- 6.1 HDLM GUI Windows 194
- 6.1.1 List of HDLM Windows 194
- 6.1.2 Window Transitions 195
- 6.2 Path Management Window 196
- Common frame 197
- Tree frame 197
- View frame 197
- 6.2.1 Common Frame 198
- 6.2.2 Tree Frame 198
- Systems User’s Guide 185 201
- Configuration view 202
- Path List view 202
- HBA port button 208
- CHA port button 208
- CHA button 208
- 6.3 Options Window 218
- 0, and then 223
- Chapter 7 Command Reference 229
- Command format 230
- 7.2 The Clear Operation 231
- 7.2.1 Format 231
- 7.2.2 Parameters 231
- 7.3 The Help Operation 232
- 7.3.1 Format 232
- 7.3.2 Parameters 232
- Examples 232
- 7.4 The Offline Operation 234
- 7.4.1 Format 234
- 7.4.2 Parameters 234
- Reference 236
- 7.5 The Online Operation 237
- 7.5.1 Format 237
- 7.5.2 Parameters 237
- 7.6 The Set Operation 240
- 7.6.1 Format 240
- 7.6.2 Parameters 240
- 0 Collects no error log 242
- 4 Outputs all information 243
- Enabled 245
- Disabled 245
- ************* 250
- 7.7 The View Operation 253
- 7.7.1 Format 253
- 7.7.2 Parameters 255
- Systems User’s Guide 241 257
- Systems User’s Guide 249 265
- Displayed Path Information 268
- Systems User’s Guide 253 269
- ...). For 272
- Systems User’s Guide 259 275
- Displayed LU Information 280
- Systems User’s Guide 265 281
- -lu -item parameter 283
- -lu -c -item parameter 283
- Chapter 8 Utility Reference 285
- 8.2.1 Format 287
- 8.2.2 Parameters 287
- Systems User’s Guide 275 291
- Systems User’s Guide 277 293
- Systems User’s Guide 279 295
- 8.3.1 Format 297
- 8.3.2 Parameters 297
- 8.4.1 Format 300
- 8.4.2 Parameters 300
- 0123456789abcdef) 301
- >dlmprsvkey -v 301
- 8.5.1 Format 302
- 8.5.2 Parameters 302
- Chapter 9 Messages 305
- Systems User’s Guide 291 307
- 292 Chapter 9 Messages 308
- Systems User’s Guide 293 309
- 294 Chapter 9 Messages 310
- Systems User’s Guide 295 311
- 296 Chapter 9 Messages 312
- Systems User’s Guide 297 313
- 298 Chapter 9 Messages 314
- Systems User’s Guide 299 315
- 300 Chapter 9 Messages 316
- Systems User’s Guide 301 317
- 302 Chapter 9 Messages 318
- Systems User’s Guide 303 319
- 304 Chapter 9 Messages 320
- Systems User’s Guide 305 321
- 306 Chapter 9 Messages 322
- 9.3 HDLM GUI Messages 323
- 308 Chapter 9 Messages 324
- Systems User’s Guide 309 325
- 310 Chapter 9 Messages 326
- Systems User’s Guide 311 327
- 312 Chapter 9 Messages 328
- Systems User’s Guide 313 329
- 314 Chapter 9 Messages 330
- Systems User’s Guide 315 331
- 316 Chapter 9 Messages 332
- Systems User’s Guide 317 333
- 318 Chapter 9 Messages 334
- 9.4 HDLM API Messages 335
- 320 Chapter 9 Messages 336
- 9.5 HDLM Manager Messages 337
- 322 Chapter 9 Messages 338
- Systems User’s Guide 323 339
- 324 Chapter 9 Messages 340
- Systems User’s Guide 325 341
- 326 Chapter 9 Messages 342
- Systems User’s Guide 327 343
- 328 Chapter 9 Messages 344
- Systems User’s Guide 329 345
- 330 Chapter 9 Messages 346
- Systems User’s Guide 331 347
- 332 Chapter 9 Messages 348
- Systems User’s Guide 333 349
- 334 Chapter 9 Messages 350
- Systems User’s Guide 335 351
- 336 Chapter 9 Messages 352
- Systems User’s Guide 337 353
- 338 Chapter 9 Messages 354
- Systems User’s Guide 339 355
- 340 Chapter 9 Messages 356
- Systems User’s Guide 341 357
- 342 Chapter 9 Messages 358
- Systems User’s Guide 343 359
- 344 Chapter 9 Messages 360
- Systems User’s Guide 345 361
- 346 Chapter 9 Messages 362
- Systems User’s Guide 347 363
- 348 Chapter 9 Messages 364
- Systems User’s Guide 349 365
- 350 Chapter 9 Messages 366
- Systems User’s Guide 351 367
- 352 Chapter 9 Messages 368
- Systems User’s Guide 353 369
- 354 Chapter 9 Messages 370
- Systems User’s Guide 355 371
- 356 Chapter 9 Messages 372
- Systems User’s Guide 357 373
- 358 Chapter 9 Messages 374
- Systems User’s Guide 359 375
- 360 Chapter 9 Messages 376
- Systems User’s Guide 361 377
- 362 Chapter 9 Messages 378
- Systems User’s Guide 363 379
- 364 Chapter 9 Messages 380
- Systems User’s Guide 365 381
- 366 Chapter 9 Messages 382
- Systems User’s Guide 367 383
- Systems User’s Guide 369 385
- 370 Chapter 9 Messages 386
- Systems User’s Guide 371 387
- 372 Chapter 9 Messages 388
- In HDLM 5.2 or 5.4 392
- In HDLM 5.5 or later 392
- Acronyms and Abbreviations 395
- Glossary 399
- 388 Glossary 404
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