Compaq BL10e - HP ProLiant - 512 MB RAM Introduction Manual
Hp power capping and dynamic power capping for proliant servers technology brief, 1st edition
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HP Power Capping and HP Dynamic Power
Capping for ProLiant servers
technology brief, 2
nd
edition
Abstract .............................................................................................................................................. 3
Introduction ......................................................................................................................................... 3
Basics of server power control ............................................................................................................... 3
Processor P-states ............................................................................................................................. 4
Clock throttling ................................................................................................................................ 5
How power capping functions ............................................................................................................... 6
Maintaining power consumption below the cap ................................................................................... 6
Minimum and maximum power consumption for a server ...................................................................... 6
Differences between HP Dynamic Power Capping and HP Power Capping ................................................ 7
Power provisioning and Dynamic Power Capping ............................................................................... 7
Support for Power Capping in ProLiant servers .................................................................................... 8
Group power capping for servers through Insight Power Manager ............................................................ 8
Enclosure Dynamic Power Capping ....................................................................................................... 9
Elements of an enclosure power cap .................................................................................................. 9
Enclosure Dynamic Power Capping operation ................................................................................... 10
Active power reallocation ............................................................................................................... 11
Enclosure Dynamic Power Capping in mixed blade environments ........................................................ 11
Opting out servers .......................................................................................................................... 11
Setting power caps for servers ............................................................................................................. 12
Setting a power cap for a single server ............................................................................................. 12
Setting a power cap for a group of servers ....................................................................................... 14
Setting an BladeSystem enclosure power cap .................................................................................... 15
Setting a power cap for a group of enclosures .................................................................................. 16
Using power capping in data center provisioning .................................................................................. 17
Choosing effective power caps ........................................................................................................ 17
Power capping to peak power consumption ...................................................................................... 19
Power capping to average power consumption ................................................................................. 21
Using Enclosure Dynamic Power Capping in power provisioning ............................................................ 21
Additional uses for power capping ...................................................................................................... 22
Power capping for emergency management ...................................................................................... 22
Time-of-day power capping ............................................................................................................. 23
Subtleties of power capping ................................................................................................................ 24
Avoiding power capping conflicts within groups ................................................................................ 24
Powering-up groups of servers when using Dynamic Power Capping ................................................... 24
Setting low or unattainable power caps on servers ............................................................................. 24
Peak power reporting and Dynamic Power Capping .......................................................................... 25
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Table of Contents
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Summary of Contents for Compaq BL10e - HP ProLiant - 512 MB RAM
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Page 1: Table Of Contents
HP Power Capping and HP Dynamic Power Capping for ProLiant servers technology brief, 2 edition Abstract .............................. 3 Introduction ............................3 Basics of server power control ....................... 3 Processor P-states ..........................4 Clock throttling ..........................5 How power capping functions ....................... 6 Maintaining power consumption below the cap ................... - Page 2 Using HP Power Regulator in conjunction with power capping ............25 Power capping and CPU utilization ....................25 Summary ............................26 For more information .......................... 26 Call to action ............................ 26...
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Page 3: Abstract
Abstract This paper describes HP power capping technologies, including the original HP Power Capping and HP Dynamic Power Capping. Both are power management features of HP ProLiant servers that operate independently of the operating system (OS) and allow system administrators to manage the power consumption of a server or group of servers. -
Page 4: Processor P-States
Figure 1. Power use in a typical server Typical Server Power Usage Base Load Hard Drives Processor PCI Slots Fans Memory Processor P-states Processor performance states, or P-states, provide a quick and effective mechanism for adjusting processor power consumption and performance. Both Intel and AMD processors support using ®... -
Page 5: Clock Throttling
Clock throttling Clock throttling provides an additional method for lowering processor power consumption. Depending on the processor model, the system BIOS can either reprogram the processor to run at a lower frequency or modulate the processor between running periods and stopped periods. Both methods have the same net effect of lowering the processor’s overall power consumption below the levels available using P-states. -
Page 6: How Power Capping Functions
How power capping functions Maintaining power consumption below the cap With power capping, an administrator can set a maximum power consumption level for an individual server or for a group of servers. The ProLiant power management system constantly monitors server power use and uses P-states and/or clock throttling to limit processor power use to control overall system power consumption. -
Page 7: Differences Between Hp Dynamic Power Capping And Hp Power Capping
Differences between HP Dynamic Power Capping and HP Power Capping Both HP Dynamic Power Capping and HP Power Capping are designed to achieve the same general goal of maintaining a server’s power consumption at or below the cap value set by an administrator. HP Dynamic Power Capping, however, monitors power consumption and maintains a server’s power cap much more rapidly than HP Power Capping. -
Page 8: Support For Power Capping In Proliant Servers
supported because Dynamic Power Capping can guard against any unexpected change in power consumption that might cause a circuit breaker to trip. Support for Power Capping in ProLiant servers Basic Power Capping is supported on ProLiant servers that feature power measurement circuitry. ProLiant G5 servers ML350, ML370, DL360, DL365, DL380, and DL385 All c-Class BladeSystem servers Basic Power Capping also requires the following system firmware:... -
Page 9: Enclosure Dynamic Power Capping
Figure 3. Apportioning a group power cap to individual servers in the group Group Power Capping Individual Servers Servers as a Group 1000 watts (Power supply maximum) 3500 watts 400 watts (Maximum) (Group power supply 320 watts (Apportioned Cap) maximum) 200 watts (Minimum) 1375 watts... -
Page 10: Enclosure Dynamic Power Capping Operation
Cooling fans for the enclosure The enclosure’s Onboard Administrator(s) An administrator can set the power cap for the enclosure to any value between the power cap lower bound and the maximum available power for the enclosure. The power cap lower bound is determined by adding up the total power that the server blades would use in their lowest P-state mode (typically about halfway between server idle and server maximum power), the maximum power that fans in the enclosure could draw, and the power-on power requests from the other elements in the... -
Page 11: Active Power Reallocation
Active power reallocation One of the more important features of Enclosure Dynamic Power Capping is the active reallocation of power amongst the server blades over time. Unlike group power capping through IPM, where a group power cap is simply apportioned as individual caps to the servers and then left alone, Enclosure Dynamic Power Capping actively reapportions the individual power caps of the servers after each monitoring cycle, based on the workloads of the individual server blades. -
Page 12: Setting Power Caps For Servers
Setting power caps for servers Administrators can set individual power caps for servers using iLO 2 or Insight Power Manager (IPM). Using IPM, administrators can also set power caps for groups of ProLiant ML and DL servers and for groups of enclosures. For individual enclosures, administrators can set power caps using the Onboard Administrator (OA) or IPM. - Page 13 In Insight Power Manager, Power Capping is located beneath the HP Power Management Actions section of the interface, as shown in Figure 6. Figure 6. Setting a power cap using Insight Power Manager...
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Page 14: Setting A Power Cap For A Group Of Servers
Setting a power cap for a group of servers Insight Power Manger is the sole tool for setting power caps for groups ProLiant ML and DL servers. Using the IPM interface, an administrator can apply a power cap to the server group that is between the minimum power and the power supply rating of the entire group. -
Page 15: Setting An Bladesystem Enclosure Power Cap
Setting an BladeSystem enclosure power cap An administrator can use either the Onboard Administrator or Insight Power Manager to set the power cap for a BladeSystem enclosure to any value between the power cap lower bound and the maximum available power for the enclosure. Figure 8 shows the Power Management screen from HP Onboard Administrator. -
Page 16: Setting A Power Cap For A Group Of Enclosures
Setting a power cap for a group of enclosures An administrator can use Insight Power Manager to apply enclosure dynamic power caps to a group of enclosures at the same time. Figure 9 shows six BladeSystem c-Class Enclosures that have been configured as a group in IPM. -
Page 17: Using Power Capping In Data Center Provisioning
Using power capping in data center provisioning Power capping is a tool to help IT organizations manage infrastructure size and costs in the data center. By setting a power cap for a server or group of servers, a data center manager can be assured that unexpected changes in workload or environment will not cause servers to consume more than the specified amount of power. - Page 18 Figure 10. HP Power Calculator results for a configured ProLiant DL380 G5 server...
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Page 19: Power Capping To Peak Power Consumption
Continuing with this example, Figure 11 shows the IPM Group Power Consumption graph for the group of eight servers running a typical variable load application. IPM generates this graph using data collected from each server’s power management system. The power management system measures power consumption two times per second and records both the peak and average power consumption. - Page 20 Calculator Utility shows for this configuration. Table 4 shows a summary of the power consumption and capacity savings for the server group. Table 4. Power consumption for eight DL380 G5 servers when capping to peak power consumption using basic Power Capping Description Power Maximum possible power consumption for 8 DL380 G5 servers...
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Page 21: Power Capping To Average Power Consumption
Power capping to average power consumption An administrator can achieve additional increases in provisioning capacity by capping the group at the average power consumption level of 1900 watts. When applied to servers running fairly uniform workloads, capping to average power consumption should not significantly impact overall average computing throughput of the servers, although it may cause an increase in latency during workload peaks. -
Page 22: Additional Uses For Power Capping
Figure 12. Provisioning with Enclosure Dynamic Power Capping Power Provisioning with Enclosure Dynamic Power Capping 7836 Watts (PSU Specification) P ower P rovisioned to P S U 2612 x 3 = 7836 watts • S ingle 3Ø L ine = 8640 •... -
Page 23: Time-Of-Day Power Capping
Time-of-day power capping Using the task scheduling capabilities in IPM, administrators can create time-of-day power capping implementations in which the power cap for a server or group of servers is lowered and raised in pre- determined pattern, typically on a daily cycle. Lowering the power cap on a group of servers during times of the day when electricity rates are highest will lower operating costs by decreasing average power use by the servers and, indirectly, by decreasing required cooling. -
Page 24: Subtleties Of Power Capping
Subtleties of power capping Avoiding power capping conflicts within groups IPM is a powerful tool for setting and managing power caps across defined groups of servers, including SIM collections. It is important to remember, however, that except for Enclosure Dynamic Power Capping, power caps are ultimately set at the individual server level. -
Page 25: Peak Power Reporting And Dynamic Power Capping
of the server. Because of these potential conflicts, best practice is to use power caps that are at least halfway between the minimum and maximum power consumption for a server or server group. Both the iLO and IPM interfaces provide a warning whenever a power cap is set to a value lower than this. Enclosure Dynamic Power Capping has resolved this issue by disallowing enclosure power caps that are too close to the aggregate minimum power for the enclosure and its server blades. -
Page 26: Summary
Summary HP Power Capping and HP Dynamic Power Capping are important power management features of HP ProLiant servers. Using power capping, system administrators can set limits on power consumption for a single server or groups of servers that will not affect server performance while enabling them to provision data center power and cooling resources to appropriate levels rather than the servers’...
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