Hp Matrix Operating Environment Software Manuel d'utilisateur Page 184
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
CPU Virtualization Overhead %
Meaning
The percent change in CPU utilization due to the overhead (or the absence of overhead) incurred
by running an application in a virtual machine.
When using virtual machines, the CPUs on the VM host do some of the work normally done by
I/O cards. This work is the virtualization overhead accrued by running an application in a virtual
machine.
You can expect that applications that require significant I/O may experience a CPU virtualization
overhead of 20%, and applications that do lots of calculations, but that require little I/O, would
have an overhead of about 10%. When in doubt about I/O usage, use 15%. If your measured
values in growth of CPU usage due to virtualization are greater than 20% for a particular workload
or set of workloads, virtualization may not be the appropriate solution for that server.
Default
The default value is 0% (0% change).
Where you might use this multiplier
• When changing a virtual machine to a server
• When changing a server to a virtual machine
Example: Making a server become a virtual machine
If your virtualization software would cause a 10% increase in CPU utilization due to the overhead
for virtualization software, enter 10 for the CPU Virtualization Overhead % to account for the
additional demand on the CPU core(s) when changing a server to a virtual machine.
Example: Making a virtual machine become a server
If your virtualization software requires a 10% increase in CPU utilization due to the overhead for
virtualization software in the virtual machine, enter -10 for the CPU Virtualization Overhead % to
account for the gain in CPU availability when changing a virtual machine to a server.
Hypervisor memory overhead
The following section presents the scaling factor that you can use to more accurately simulate the
impact of including a hypervisor in your scenario. With the addition of a hypervisor, memory
utilization increases due to the operation of the hypervisor. The Hypervisor Memory Overhead
helps you to account for this in a scenario.
Hypervisor memory overhead
Meaning
The amount of memory used by the virtualization platform to host virtual machines. The size of the
memory overhead varies for each virtualization platform.
Default
Capacity Advisor calculates the value for you.
Where you might use this percentage adjustment
• When moving workloads from one system platform to another different system platform in a
scenario, where one or both system platforms are VM hosts.
Doing the math for hypervisor memory overhead
When you encounter this adjustment factor in altering a scenario, you have a choice to supply
your own values. To help you with this, the following calculation examples are provided.
HP Virtual Machine
To compute the memory overhead of the hypervisor, use the following formula:
750 MB (.73 GB) + 7.5% of (Total Physical Memory – 1 GB)
184 Calculation assistance
- Abstract 1
- Contents 3
- 4 Contents 4
- Contents 5 5
- 6 Contents 6
- Contents 7 7
- 8 Contents 8
- Contents 9 9
- 10 Contents 10
- 1 Introduction 11
- Setup considerations 12
- Upgrades and reinstallation 13
- 14 Introduction 14
- 2 Features 15
- Data collection 16
- Data collection 17 17
- Differences in memory data 19
- Experimentation 20
- Modeling considerations 22
- Capacity Advisor commands 22
- Capacity planning goals 23
- Data normalization 24
- Upper bounds 24
- Headroom 25
- Peaks and sums 25
- Sampling interval 25
- Headroom star rating 26
- Missing or invalid data 27
- Utilization limits 28
- ◦ CPU cores 28
- ◦ Memory 28
- ◦ Network I/O bandwidth 28
- ◦ Disk I/O bandwidth 28
- ◦ Percentage of time limits 29
- Scope of utilization limits 30
- Adjusting power 31
- Exclusion of data points 33
- Forecasting growth 34
- Forecast model attributes 35
- 4 Procedures 37
- Data retention period 38
- Data collection options 38
- 40 Procedures 40
- Viewing the licensed servers 42
- From the command line 44
- Producing graphs and reports 46
- Optimize 48
- Using the report wizard 49
- The report wizard 50
- 52 Procedures 52
- 54 Procedures 54
- Creating a population report 56
- Creating a trend report 56
- Setting utilization limits 57
- Adding a utilization limit 58
- Removing a utilization limit 58
- Forecasting utilization 60
- Forecasting utilization 61 61
- 62 Procedures 62
- Defining a forecast model 63
- Working with scenarios 64
- Creating a planning scenario 65
- Editing a scenario 66
- Controlling the data display 67
- Copying a scenario 68
- Renaming a scenario 69
- Getting there 70
- Deleting a scenario 71
- Working with systems 72
- Adding an existing system 73
- Editing a system 74
- Changing VMs to be servers 74
- Change servers to be VMs 75
- 76 Procedures 76
- Working with systems 77 77
- Moving a virtual machine 78
- Working with workloads 79
- Creating a workload 80
- Editing a workload 81
- Moving a workload 81
- 82 Procedures 82
- Parking a workload 83
- Deleting a workload 83
- Calibrating a single system 85
- 86 Procedures 86
- Begin with a scenario 89
- 90 Procedures 90
- Expected results 91
- Choose the workloads to stack 95
- 96 Procedures 96
- Getting more detail 97
- 98 Procedures 98
- 5 Using Capacity Analysis 99
- Accessing Capacity Analysis 100
- Exploring the Analysis tab 100
- Working with the Analysis tab 101
- Analysis queries table 103
- 104 Using Capacity Analysis 104
- Analysis query results table 105
- Predefined analysis queries 106
- Finding overused systems 107
- Controlling power costs 109
- Prerequisites 109
- Creating the query 109
- 110 Using Capacity Analysis 110
- Constructing a filter 112
- Filter creation tips 114
- Using sub-expressions 114
- Attribute selection 115
- System Tab 116
- Memory Tab 118
- Network Tab 119
- Disk Tab 120
- Power Tab 121
- Custom query examples 122
- Defining the query 123
- Revising the query 124
- Background 125
- Requirements 126
- Custom query examples 127 127
- 128 Using Capacity Analysis 128
- Custom query examples 129 129
- Changing analysis queries 130
- Getting ready 131
- Related topic 133
- Related topics 138
- Adding processor cores 140
- Screen 1 of 3 144
- Screen 2 of 2 145
- Screen 3 of 3 145
- Create a planning scenario 149
- When there is no connection 157
- Data is not being collected 158
- Other possibilities 160
- Setting the time or time zone 160
- 2003 Server 162
- Data cannot be imported 164
- Working with reports 166
- Working with power 167
- Workload issues 168
- Command error messages 171
- Command warning messages 172
- Contacting HP 177
- Related information 177
- Calculation assistance 179
- Memory multiplier 180
- CPU workload multiplier 181
- Memory workload multiplier 181
- Disk I/O workload multiplier 182
- CPU Virtualization Overhead % 183
- Hypervisor memory overhead 184
- 186 Calculation assistance 186
- Command reference 189
- SYNOPSIS 190
- DESCRIPTION 190
- 192 Command reference 192
- Dependencies 193
- EXAMPLES 194
- DOCUMENT LAST UPDATED 194
- RETURN VALUES 197
- FILES ON CMS 198
- SEE ALSO 198
- # capagentlesscfg -m180 202
- Units and terminology 207
- Scenario comparison report 211
- Workload Detail 212
- Scenario Inventory 213
- Glossary 219
- 222 Glossary 222
- 224 Glossary 224
- 226 Glossary 226
- 228 Index 228
- 230 Index 230
- 232 Index 232
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