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Load Balancing Algorithms
The load balancing function uses VMware vSphere PSPs or PSPs provided by
HDLM. The following table lists the load balancing algorithms that HDLM can
use.
Table 2-5 Load Balancing Algorithms
Algorithm name PSP name
Extended Round Robin HTI_PSP_HDLM_EXRR
Extended Least I/Os HTI_PSP_HDLM_EXLIO
Extended Least Blocks HTI_PSP_HDLM_EXLBK
Most Recently Used (VMware) VMW_PSP_MRU
Round Robin (VMware) VMW_PSP_RR
PSPs for the Extended Round Robin, Extended Least I/Os, and Extended
Least Blocks algorithms are installed together with HDLM. These algorithms
determine which path to allocate based on whether the data of the I/O to be
issued is sequential with the data of the I/O that was issued immediately
beforehand.
If the data is sequential, the path used will be the one to which the data of
the I/O that was issued immediately beforehand was distributed. However, if
a specified number of I/Os has been issued to a path, processing switches to
the next path.
If the data is not sequential, these algorithms select the path to be used each
time an I/O request is issued.
• Extended Round Robin:
The paths are simply selected in order from among all the connected
paths.
• Extended Least I/Os
The path that has the least number of I/Os being processed is selected
from among all the connected paths.
• Extended Least Blocks
The path that has the least number of I/O blocks being processed is
selected from among all the connected paths.
The default algorithm is the Extended Least I/Os algorithm, which is set when
HDLM is first installed. When an upgrade installation of HDLM is performed,
the algorithm that is currently being used is inherited.
Select the load balancing algorithm most suitable for the data access patterns
of your system environment. However, if there are no recognizable data
access patterns, we recommend using the default algorithm, the Extended
Least I/Os algorithm.
2-12
HDLM Functions
Hitachi Dynamic Link Manager (for VMware®) User Guide
- Dynamic Link Manager 1
- Contents 3
- Intended audience 10
- Product version 10
- Release notes 10
- Document revision level 10
- Document organization 10
- Related documents 11
- Document conventions 11
- Convention Description 12
- Physical capacity unit Value 12
- Logical capacity unit Value 12
- Getting help 13
- Comments 13
- Overview of HDLM 15
- What is HDLM? 16
- HDLM Features 16
- HDLM Functions 19
- Devices Managed by HDLM 20
- System Configuration 20
- Components Description 21
- LU Configuration 24
- Program Configuration 24
- Program name Functions 25
- HDLM driver and NMP positions 26
- HUS100 Series, or HUS VM 29
- Load Balancing Algorithms 30
- Automatic Path Switching 31
- Automatic Failbacks 33
- Manual Path Switching 34
- Path Status Transition 35
- Status Transitions of a Path 36
- Checking Intermittent Errors 38
- Function 40
- Error Management 41
- Types of Collected Logs 42
- Collecting Audit Log Data 44
- Category Explanation 45
- Severity 47
- Message ID 47
- Audit Log Data Formats 49
- Creating an HDLM Environment 53
- HDLM System Requirements 54
- Memory Requirements 55
- If an FC-SAN is used: 55
- If an IP-SAN is used: 55
- HDLM Installation Types 56
- Installing HDLM 58
- New installation on host 61
- . Install HDLM on the host 62
- . Restart the host 62
- *" -s HTI_SATP_HDLM 63
- Host settings 64
- Creating a user account 64
- Setting Up HDLM 67
- Checking the Current Settings 68
- Setting Up the HDLM Functions 68
- Setting Up Load Balancing 69
- Checking the Updated Settings 71
- Setting Up Integrated Traces 72
- Dialog Box 73
- Removing HDLM 74
- . Check the removal results 76
- HDLM Operation 77
- Notes on Using Commands 78
- Viewing Path Information 78
- Changing the Status of Paths 79
- Viewing LU Information 80
- Viewing License Information 82
- Updating the License 83
- Starting the HDLM Manager 85
- Stopping the HDLM Manager 85
- HDLM Resident Processes 86
- Troubleshooting 87
- What To Do for a Path Error 88
- Examining the Messages 89
- Obtain Path Information 89
- Identifying the Error Path 89
- Placing the Path Online 90
- Obtaining Program Information 91
- What To Do for Other Errors 92
- Command format 94
- Operation Functions 95
- Parameter 97
- Parameters 100
- Reference 103
- To place paths Online 103
- Command Reference 108
- Table 6-3 License Key Types 112
- Value Explanation 114
- Operation Display Item 114
- Examples 115
- Example 1 115
- Example 2 116
- Example 3 116
- To Display Path Information 117
- To display path information 117
- PathName pn 127
- DskName dn 127
- Items of Path information 132
- To display LU information 138
- Items of LU information 143
- Utility Reference 153
- Overview of the Utilities 154
- Collecting Error Information 156
- Directory that stores 157
- Files Explanation 157
- About the Log File 163
- Messages 165
- Format Meaning 166
- Terms Meaning 166
- KAPL01001 to KAPL02000 167
- KAPL03001 to KAPL04000 191
- KAPL04001 to KAPL05000 192
- KAPL08001 to KAPL09000 198
- KAPL09001 to KAPL10000 200
- KAPL10001 to KAPL11000 205
- KAPL11001 to KAPL12000 210
- KAPL13001 to KAPL14000 213
- KAPL15001 to KAPL16000 214
- KAPL20001 to KAPL21000 215
- KAPL21001 to KAPL22000 223
- Component 224
- Explanation 225
- Acronyms and abbreviations 231
- Acronyms-2 232
- Acronyms-3 233
- Acronyms-4 234
- Acronyms-5 235
- Acronyms-6 236
- Glossary 237
- Glossary-2 238
- Glossary-3 239
- Glossary-4 240
- Glossary-5 241
- Glossary-6 242
- Warning 8-2 247
- MK-92DLM130-07 250
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