Hp Hitachi Dynamic Link Manager Software Manuel d'utilisateur Page 31
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Figure 2-6 Driver Levels of the HDLM and MPIO Drivers
Distributing a Load Using Load Balancing
When the system contains multiple paths to a single LU, HDLM can distribute
the load across the paths by using multiple paths to transfer the I/O data.
This function is called load balancing, and it prevents a single, heavily loaded
path from affecting the performance of the entire system.
Note that some I/O operations managed by HDLM can be distributed across
all, available paths, and some cannot. Therefore, even when the load
balancing function is used, a particular I/O operation might not necessarily
allocate data to every available path. RAID Manager issuing IOCTL to a
command device is an example of an I/O operation that cannot allocate data
to every path.
Note:
Do not use the load balancing function that is accessible from the
Microsoft iSCSI Software Initiator user interface.
In a cluster environment, the load balancing function is available for the
Thunder 9500V series, Lightning 9900 series, Lightning 9900V series, Hitachi
AMS2000/AMS/WMS/SMS series, Hitachi USP, Universal Storage Platform V/
HDLM Functions
2-11
Hitachi Dynamic Link Manager User Guide (for Windows(R))
- Dynamic Link Manager Software 1
- Contents 3
- Product version 12
- Release notes 12
- Document revision level 12
- Document organization 12
- Intended audience 12
- Referenced documents 13
- Document conventions 13
- General font conventions 14
- Getting help 16
- Comments 16
- Overview of HDLM 17
- What is HDLM? 18
- HDLM Features 19
- HDLM Functions 21
- Cluster Support 22
- Devices Managed by HDLM 23
- System Configuration 23
- Components Description 24
- LU Configuration 27
- Program Configuration 29
- Program name Functions 30
- Load Balancing Algorithms 34
- Automatic Path Switching 37
- Automatic Failbacks 38
- Manual Path Switching 39
- Path Status Transition 40
- The Offline Path Statuses 41
- Status Transitions of a Path 41
- Automatic Failback Is Used) 44
- Monitoring 47
- Dynamic Re-configuration 50
- Error Management 51
- Types of Collected Logs 52
- Table 2-8 Error Levels 54
- Collecting Audit Log Data 55
- Category Explanation 56
- Severity 58
- Message ID 58
- Correspondence with event 61
- Audit Log Data Formats 62
- Explanation 63
- HDLM System Requirements 68
- Microsoft MPIO Drivers 69
- Supported Storage systems 69
- Exchange Data 71
- OS Related programs 72
- >dlnkmgr view -sys -sfunc 77
- Memory Requirements 78
- Disk Requirements 78
- HDLM Installation Types 79
- Notes on HBAs and HBA Drivers 80
- Notes on Storage systems 80
- Notes on HDLM Versions 80
- Notes on Windows 82
- Code = -99 nnnnn 83
- Problem What to do 84
- Notes on Related Software 85
- \InstallationInformation\ 89
- Installing HDLM 90
- Installation 92
- Creating an HDLM Environment 100
- . Install MSCS on the host 104
- . Restart the host 104
- . Perform the installation 104
- When VCS Is Used 108
- When Oracle RAC Is Used 112
- In a Non-Cluster Environment 117
- When MSCS Is Used 121
- Installing JRE 131
- Setting Up HDLM 134
- Checking the Current Settings 135
- Setting Up the HDLM Functions 136
- Setting the Trace Level 141
- Setting the Trace File Size 142
- >dlnkmgr set -systfs 2000 143
- >dlnkmgr set -systfn 10 143
- Value (severity) Explanation 143
- Checking the Updated Settings 144
- Setting Up Integrated Traces 145
- Setting Default value 146
- Recommended 146
- Dialog Box 147
- Uninstalling HDLM 148
- HDLM Operation 159
- Notes on Using HDLM 160
- Using Windows Server 2008 161
- Notes on Using the HDLM GUI 162
- Viewing the GUI Help 162
- Notes on Using Commands 162
- Viewing Path Information 163
- Changing the Status of Paths 163
- Viewing LU Information 165
- Viewing License Information 168
- Updating the License 168
- Check Path Information 170
- Table 4-1 List of Counters 171
- Starting the HDLM Manager 172
- HDLM Resident Processes 173
- When MSCS is not used 174
- When MSCS is used 175
- Checking an Added Path 176
- Deleting an LU Dynamically 177
- Item Description 179
- Troubleshooting 181
- What To Do for a Path Error 184
- Examining the Messages 185
- Obtaining Path Information 185
- Identifying the Error Path 186
- Placing the Path Online 186
- Obtaining Program Information 187
- What To Do for Other Errors 188
- Command Reference 189
- Command format 190
- Parameters 191
- Parameter 192
- Reference 197
- To Place Paths Online 198
- Value Description 205
- >dlnkmgr set -ellv 1 205
- Table 6-4 Trace Level Values 206
- Table 6-6 License Key Types 214
- Examples 223
- Information 225
- Displayed path information 234
- Parameter and Sub-parameters 243
- Displayed LU information 247
- Utility Reference 255
- Overview of the Utilities 256
- Collecting Error Information 258
- Folder that stores collected 259
- Files Explanation 259
- Reservation Key 266
- HDLM installation folder 270
- Version of the installed HDLM 270
- About the Log File 279
- Messages 283
- Format Meaning 285
- Terms Meaning 285
- KAPL01001 to KAPL02000 286
- KAPL02001 to KAPL03000 307
- KAPL03001 to KAPL04000 320
- KAPL04001 to KAPL05000 323
- KAPL05001 to KAPL06000 330
- KAPL07001 to KAPL08000 334
- KAPL08001 to KAPL09000 336
- KAPL09001 to KAPL10000 339
- KAPL10001 to KAPL11000 362
- KAPL11001 to KAPL12000 371
- KAPL12001 to KAPL13000 373
- KAPL13001 to KAPL14000 381
- KAPL15001 to KAPL16000 384
- Component 387
- Message ID Explanation 388
- Versions of HDLM 395
- Differences in Default Values 396
- Offline(E) Status 399
- Environment 401
- Acronyms and abbreviations 403
- Acronyms-2 404
- Acronyms-3 405
- Acronyms-4 406
- Acronyms-5 407
- Acronyms-6 408
- Glossary 409
- Glossary-2 410
- Glossary-3 411
- Glossary-4 412
- Glossary-5 413
- Glossary-6 414
- MK-92DLM129-21 422
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