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Power Policies 96
How Does a Dynamic Power Policy Work?
To understand how a dynamic policy works, you need to understand the
following terms first:
• Consumption
—
The power a device is using.
•Power Cap
—
The maximum amount of power that a device is allowed to
consume (may not be equal to its demand).
• Headroom
—
The difference between power cap and power consumption
of a device or a group of devices under a power policy.
•Demand
—
Amount of power a device requests to accommodate its
workload.
The top priority of the dynamic power policy is to maintain the power cap of
the group. Maintaining this cap means that all devices can execute their
workloads without needing more power than the cap. The priority of the
device may not be taken into account when allocating power cap to a group of
devices if most, or the entire power cap is allocated towards maintaining the
power cap on each of the devices in the policy; if lower priority devices require
more power to maintain their cap, they may actually receive more power than
a higher-priority device. If the power cap is too restrictive and the group
power consumption exceeds the power cap, an event is sent for the power
policy. You need to reconsider the power allocation or adjust workloads when
a power policy is consistently violated by one or more devices exceeding their
power cap.
If fluctuations in device power requirements happen once the power cap is
successfully established for all devices in a power policy, a device requiring
more power may not get it as the power cap of another device in the policy
could become violated as it is lowered. If you wish to force one or more
devices in a policy to a lower cap, you can create a static power policy for the
device at a lower level. In this case, the most restrictive power cap of the
overlapping policies is applied to the device.
If there is excess available power from the power cap (known as headroom)
after the power capping requirements is met for all devices in the policy, then
this excess power can be allocated dynamically according to the priority and
demand of the device in the power policy.
OpenManagePowerCenter_User_Guide.book Page 96 Friday, March 2, 2012 10:33 AM
- User Guide 1
- Notes, Cautions, and Warnings 2
- Contents 3
- Overview 11
- Topology 12
- System Requirements 13
- Supported Devices 14
- Getting Started 16
- Use Case Introduction 18
- Getting Started 19 19
- Use Case 4: Managing Devices 20
- Structure 20
- Events of a Device or Group 21
- Devices/Groups 21
- Getting Started 22 22
- Installing and Launching 23
- Installed Directories 26
- Power Center Services 26
- Uninstalling Power Center 27
- Launching Power Center 28
- Installing and Launching 29 29
- Access Control 30
- Access Control 32 32
- Access Control 33 33
- Access Control 34 34
- Single Domain Environment 35
- Access Control 36 36
- Multiple Domain Environment 37
- Access Control 38 38
- Multiple User Login 39
- Logging out 40
- Managing User Roles 40
- Managing User Accounts 41
- Updating a User 42
- Deleting a User 42
- Managing Privileges 43
- Global Configuration 46
- Device Discovery 47
- Manage Role/User 47
- View Device/Group 47
- Manage Device/Group 47
- Manage Policy 48
- Manage Event 48
- Licensing 49
- Viewing License 50
- Device Discovery 52 52
- Adding a Device Manually 54
- Device Discovery 55 55
- Protocol Profile 56
- Device Management 58
- Editing Devices 60
- Editing Protocol 61
- Deleting Devices 61
- Filtering Devices 62
- Sorting Devices 63
- Group Management 64
- Finding a Group or Device 65
- Group Management 66 66
- Physical Groups 67
- Managing Physical Groups 68
- Moving a Physical Group 71
- Editing Physical Groups 72
- Deleting Physical Groups 72
- Viewing Physical Groups 72
- Physical Groups 73 73
- Logical Groups 74
- Editing Logical Groups 76
- Deleting Logical Groups 76
- Viewing Logical Groups 76
- Logical Groups 77 77
- Power Monitoring 78
- Power Monitoring 79 79
- Viewing Power Details 80
- Viewing Energy Consumption 82
- Monitoring PDU Power 83
- Monitoring UPS Power 84
- Power Dashboard 85
- Power Monitoring 86 86
- Power Monitoring 87 87
- Temperature Monitoring 88
- Viewing Temperature Details 89
- Temperature Dashboard 92
- Temperature Monitoring 93 93
- Temperature Monitoring 94 94
- Power Policies 95
- Power Policies 96 96
- Power Policy Capabilities 97
- Creating a Policy 98
- Viewing Policy Details 101
- Policy Priority Levels 101
- Policy Modes 102
- Enabling/Disabling Policy 102
- Updating a Policy 103
- Deleting Policies 103
- Filtering Policies 104
- Emergency Power Reduction 104
- Policy-Related Events 105
- Comparing 106
- Adding a Device or Group 107
- Comparing 108 108
- Event Management 109
- Custom Events 112
- Supported PDU/UPS Events 114
- Event Severity Levels 115
- Viewing Events 115
- Sorting Events 116
- Editing Events 116
- Deleting Events 116
- Filtering Events 117
- Event Management 119 119
- Security 120
- Security 121 121
- OS Hardening 122
- Audit Log 123
- Managing Certificates 124
- Security 125 125
- Configuring Power Center 126
- Default Units Settings 127
- Energy Consumption Settings 128
- SNMP Traps Settings 128
- Configuring Power Center 129 129
- Database Policy Settings 130
- Configuring Power Center 131 131
- "-1" 131
- Installation Settings 132
- Configuring Power Center 133 133
- Configuring Power Center 134 134
- Configuring Power Center 135 135
- Configuring Power Center 136 136
- Configuring Power Center 137 137
- Kerberos Realm Settings 138
- Backup and Recovery 139
- Power Center Backup 140
- Power Center Recovery 141
- Backup and Recovery 142 142
- Troubleshooting 144
- Troubleshooting 145 145
- Troubleshooting 146 146
- Troubleshooting 147 147
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