HP Integrity NonStop NB54000c Introduction Manual
HP Integrity NonStop NB54000c Introduction Manual

HP Integrity NonStop NB54000c Introduction Manual

Hp power capping and hp dynamic power capping for proliant servers
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HP Power Capping and HP Dynamic Power Capping for
ProLiant servers
Technology brief, 2
nd
Edition
Introduction ......................................................................................................................................... 3
Basics of server power control ............................................................................................................... 3
Processor P-states ............................................................................................................................. 4
Clock throttling................................................................................................................................. 4
How power capping functions ............................................................................................................... 5
Maintaining power consumption below the cap ................................................................................... 5
Minimum and maximum power consumption for a server ...................................................................... 5
Differences between HP Dynamic Power Capping and HP Power Capping ................................................. 6
Power provisioning and Dynamic Power Capping ................................................................................ 6
Support for Power Capping in ProLiant servers .................................................................................... 7
Enclosure Dynamic Power Capping ....................................................................................................... 8
Elements of an enclosure power cap ................................................................................................... 8
Operation of Enclosure Dynamic Power Capping ................................................................................. 9
Active power reallocation ............................................................................................................... 10
Enclosure Dynamic Power Capping in mixed blade environments ........................................................ 10
Opting out servers .......................................................................................................................... 10
Setting power caps for servers ............................................................................................................. 10
Setting a power cap for a single server ............................................................................................. 11
Setting a power cap for a group of servers ....................................................................................... 13
Setting a BladeSystem enclosure power cap ...................................................................................... 13
Setting a power cap for a group of enclosures ................................................................................... 14
Using power capping in data center provisioning .................................................................................. 15
Choosing effective power caps ........................................................................................................ 15
Power capping to peak power consumption ...................................................................................... 17
Power capping to average power consumption ................................................................................. 19
Using Enclosure Dynamic Power Capping in power provisioning ............................................................. 19
Power capping for emergency management ...................................................................................... 20
Time-of-day power capping ............................................................................................................. 21
Subtleties of power capping ................................................................................................................ 22
Avoiding power capping conflicts within groups ................................................................................ 22
Powering up groups of servers when using Dynamic Power Capping ................................................... 22
Setting low or unattainable power caps on servers ............................................................................. 22
Peak power reporting and Dynamic Power Capping .......................................................................... 23
Using HP Power Regulator in conjunction with power capping ............................................................ 23
Power capping and CPU utilization .................................................................................................. 23
Power capping and option cards ..................................................................................................... 23

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Summary of Contents for HP Integrity NonStop NB54000c

  • Page 1: Table Of Contents

    HP Power Capping and HP Dynamic Power Capping for ProLiant servers Technology brief, 2 Edition Introduction ............................3 Basics of server power control ....................... 3 Processor P-states ..........................4 Clock throttling..........................4 How power capping functions ....................... 5 Maintaining power consumption below the cap ................... 5 Minimum and maximum power consumption for a server ..............
  • Page 2 Providing a guardband for a power capping group ................23 Summary ............................24 For more information .......................... 25 Call to action ............................ 25...
  • Page 3: Introduction

    Introduction Server performance-per-watt continues to increase steadily. However, the number of watts-per-server also continues to climb steadily. These increases, combined with the increasing number of servers and density in modern data centers, make planning and managing facility power and cooling resources critically important. HP Power Capping and HP Dynamic Power Capping are ProLiant power management tools that assist the data center administrator in these critical tasks.
  • 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 P-states to decrease processor ®...
  • Page 5: How Power Capping Functions

    Figure 2. Power versus performance characteristics for a typical Intel-based ProLiant server with three P-states DL360 G4 Power vs. Work Done P-state slope Clock Throttling slope 0.25 0.75 1000 1500 2000 2500 3000 3500 4000 4500 Relative Performance Performance Iterations 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...
  • Page 6: Differences Between Hp Dynamic Power Capping And Hp Power Capping

    produce. However, the enclosure’s power supply array powers HP BladeSystem servers. For a blade server, the maximum available power is the amount of power that the enclosure’s Onboard Administrator reserved for that server blade. Both iLO and Insight Control report this value: iLO reports it as Power supply maximum power for ML and DL servers and as Initial power-on request value for BladeSystem servers.
  • Page 7: Support For Power Capping In Proliant Servers

    trip. HP has tested Dynamic Power Capping to ensure that it can prevent tripping circuit breakers that have a specified trip time of 3 seconds or longer at 50 degrees C and 150 percent overload. Dynamic Power Capping can keep server power consumption below the power cap in real time. Therefore, administrators can use it as an effective tool in planning and managing both electrical provisioning and cooling requirements in the data center.
  • Page 8: 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 9: Operation Of Enclosure Dynamic Power Capping

    An administrator can set the enclosure power cap to any value between the lowest total power consumption and the maximum available power for the enclosure. Adding these values yields the lowest reasonable power cap maintainable for the enclosure under all operating conditions: •...
  • Page 10: 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. After each monitoring cycle, Enclosure Dynamic Power Capping actively reapportions the individual power caps of the server blades based on their individual workloads. With the blade power budget as its limit, the OA software uses a sophisticated, multi-tiered algorithm to increase the power caps of individual servers that are busier and using more power.
  • Page 11: Setting A Power Cap For A Single Server

    Setting a power cap for a single server Administrators can set a power cap for an individual server or server blade through iLO or through Insight Control. In the iLO 2 browser-based interface (Figure 5), Power Capping Settings is located beneath the Power Management tab in the Settings subsection.
  • Page 12 In Insight Control, Power Capping is located beneath the HP Power Management Actions section of the interface, as shown in Figure 6. or an HP BladeSystem server Figure 6. Setting a power cap f using Insight Control...
  • Page 13: Setting A Power Cap For A Group Of Servers

    Setting a power cap for a group of servers Insight Control is the sole tool for setting power caps for groups of ProLiant ML and DL servers. Using the Insight Control interface (Figure 7), an administrator can apply a group power cap that is between the minimum power and the power supply rating of the entire group.
  • Page 14: Setting A Power Cap For A Group Of Enclosures

    Figure 8. Setting an Enclosure Dynamic Power Cap in HP Onboard Administrator 2.60 Setting a power cap for a group of enclosures An administrator can use Insight Control to apply enclosure dynamic power caps to a group of enclosures at the same time.
  • Page 15: Using Power Capping In Data Center Provisioning

    the enclosure and to create power caps for the individual server blades. It will then monitor and adjust the individual server blade power caps based on their power demands. Figure 9. Setting a power cap for a group of enclosures in Insight Control 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.
  • Page 16 indicate that the Total System Input power requirement for this server configuration is 423 watts. This is the predicted maximum amount of power that this server configuration would use under environmental and load conditions. It is one of the numbers that an administrator could use when calculating the maximum power and cooling requirements to support this system in the data center.
  • Page 17: Power Capping To Peak Power Consumption

    Continuing with this example, Figure 11 shows the Insight Control Group Power Consumption graph for the group of eight servers running a typical variable load application. Insight Control generates this graph using data collected from each server’s power management system. The power management system measures power consumption twice per second and records both the peak and average power consumption.
  • Page 18 which is high in the dynamic range of the servers. So the effects of configuration and environmental changes are ignored. 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...
  • Page 19: Power Capping To Average Power Consumption

    are not all the same, HP recommends using Insight Control to review the peak power consumption of each server to ensure that the selected Dynamic Power Cap will not significantly limit its actual peak power consumption. Power capping to average power consumption An administrator can further increase provisioning capacity by capping the example group shown in Figure 11 at the average power consumption: 1900 watts.
  • Page 20: Power Capping For Emergency Management

    Figure 12. Provisioning with Enclosure Dynamic Power Capping Power Provisioning with Enclosure Dynamic Power Capping 7836 Watts (PSU Specification) P ower P rovis ioned to P S U 2612 x 3 = 7836 watts • S ingle 3Ø L ine = 8640 •...
  • Page 21: Time-Of-Day Power Capping

    Time-of-day power capping Insight Control has task-scheduling capabilities. Administrators can create time-of-day power capping for a server or group of servers that lowers and raises power levels in a pre-determined pattern, typically on a daily cycle. Lowering the power cap on a group of servers when electricity rates are highest will lower operating costs. It decreases the average power use by the servers and, indirectly, decreases required cooling.
  • Page 22: Subtleties Of Power Capping

    Subtleties of power capping Avoiding power capping conflicts within groups Insight Control 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 23: Peak Power Reporting And Dynamic Power Capping

    Peak power reporting and Dynamic Power Capping Both iLO and Insight Control report the power metrics for ProLiant servers, including peak power consumption. The power monitoring system for servers records peak power consumption as the largest half-second power measurement in a 5-minute period. It can take up to one-half second to bring a server’s power consumption back below the cap.
  • Page 24 Administrators should consider the following factors for determining the amount of power to reserve as a guardband: The guardband should allow any individual server in the group to power up at full power while constraining • other servers on the same circuit to their cap value. The preceding “Powering up groups of servers when using Dynamic Power Capping”...
  • Page 25: For More Information

    Send comments about this paper to TechCom@HP.com © Copyright 2008, 2009, 2010 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services.

This manual is also suitable for:

Proliant dl280

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