Technical Whitepaper Emergency Power Reduction (EPR) feature with OpenManage Enterprise Power Manager Abstract This white paper provides an overview about the effective utilization of Emergency Power Reduction feature in a datacenter environment with Dell EMC OpenManage Enterprise Power Manager.
Revisions Revisions Date Description August 2020 Initial Release with OpenManage Enterprise 3.4.1 and Power Manager 1.2 versions. Acknowledgements This paper was produced by following members of the Enterprise System Software development team. Author: Jimmy Muraleedharan, Test Senior Engineer Support: Shruthi Ravoor, Technical Content Developer 2 Infographics: Moncy Lavy, Advisor, Engineering Graphic Design The information in this publication is provided “as is.” Dell Inc.
Table of contents Table of contents Revisions............................................................................................................................................................................. 2 Acknowledgements ............................................................................................................................................................. 2 Table of contents ...............................................................................................
Acronyms Acronyms 4 Acronym Expansion OME OpenManage Enterprise iDRAC Integrated Dell Remote Access Controller EPR Emergency Power Reduction CMC Chassis Management Controller MM Management Module MCM Multi Chassis Management MSM Modular System Management REST REpresentational State Transfer GUI Graphical User Interface ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers API Application Program Interface PDU Power Distribution Unit Emergency Power Red
Executive Summary Executive Summary This technical whitepaper describes the significance of Emergency Power Reduction (EPR) in modern datacenters and the application of same with Dell EMC OpenManage Enterprise Power Manager.
Introduction 1 Introduction Dell EMC OpenManage Enterprise Power Manager is an extension to Dell EMC OpenManage Enterprise console and uses fine-grained instrumentation to provide increased visibility over power consumption, anomalies, and utilization.
Introduction Power Distribution Unit (PDU) failure causing a drop in overall Rack Power Availability EPR applied by Power Manager on Low Priority Servers when the backup power source is in effect 7 Emergency Power Reduction (EPR) feature with OpenManage Enterprise Power Manager
Emergency Power Reduction 2 Emergency Power Reduction In case of an emergency event such as a power failure forcing the datacenter to run on a backup power supply or a failure of the datacenter cooling mechanism, an administrator can initiate EPR to reduce the overall power consumption of the managed devices. Based on the priority of managed devices, use different EPR actions for different devices. Throttle and Graceful Shutdown are the two different EPR actions supported by Power Manager. 2.
Emergency Power Reduction License Requirements for EPR actions on Chassis Chassis Models CMC Enterprise License Supported EPR Actions PowerEdge MX7000 Not Applicable EPR Throttle PowerEdge M1000e Not Applicable EPR Throttle PowerEdge VRTX ✔ EPR Throttle PowerEdge VRTX ❌ None PowerEdge FX2s ✔ EPR Throttle PowerEdge FX2s ❌ None Note: Refer the Compatibility Matrix in OpenManage Enterprise Power Manager User’s Guide to check the supported list of PowerEdge servers and chassis. 2.3.
Enable EPR using Power Manager 3 Enable EPR using Power Manager Apply EPR either for Individual Devices or Custom Groups (Static and Physical). To Apply EPR (Throttle or Shutdown), perform the following steps from OpenManage Enterprise after installing Power Manager. 3.1 EPR for Individual Devices Perform the following steps to apply EPR on individual devices: 1. Login to Dell EMC OpenManage Enterprise and click the Devices tab. All devices discovered in OpenManage Enterprise are displayed. 2.
Enable EPR using Power Manager EPR Actions available for Servers • After applying EPR on the target device, on the Policies and EPR tab of devices with an active EPR, a red color banner is displayed with the following message: EPR Throttle (or EPR Shut down) is enabled. EPR is applied manually. Banner indicating EPR type and Source in Device Details • EPR is applied successfully on target device and the details are available in Power Management > Emergency Power Reduction tab.
Enable EPR using Power Manager EPR Details (for Device) on Emeregency Power Reduction tab For a device that is monitored as part of a physical group, apply EPR from Power Management > Rack View tab. To apply EPR on a device: 1. Click device name of Power Manager capable devices from Rack View. The Power Management and Monitoring details tab is displayed. 2. Navigate to Policies and EPR tab and click Apply EPR.
Enable EPR using Power Manager 3.2 EPR for Static and Physical Groups 1. Login to Dell EMC OpenManage Enterprise and navigate to Devices > Static Groups > Group Name or Devices > Extension Groups > Physical Hierarchy > Group Name. All devices that are part of the selected group are displayed. 2. To view Power Manager related information, click Group Details. 3. In Group Details tab, navigate to Policies and EPR tab, and then click Apply EPR button.
Enable EPR using Power Manager Banner indicating EPR type and Source in Group Details tab Audit log(s) also mention the task status and corrective actions required for failed EPR actions on target devices. • Message ID—CPWR0023, Severity—Warning, Category—Configuration Message—Unable to enable the Emergency Power Reduction feature on the target because the feature is already enabled on the target.
Disable EPR using OpenManage Enterprise Power Manager 4 Disable EPR using OpenManage Enterprise Power Manager To disable the EPR, perform the following steps: 1. Login to OpenManage Enterprise and navigate to Power Management > Emergency Power Reduction tab. Emergency Power Reduction tab in Power Management section 2. Select the device(s) or group(s) for which you want to disable EPR and click Disable. 3. In the confirmation page, click Yes. EPR is disabled successfully.
Disable EPR using OpenManage Enterprise Power Manager Message—The Emergency Power Reduction feature is successfully disabled on the target . Emergency Power Reduction tab in Power Management section Audit log(s) also mention the task status and corrective actions required for failed EPR actions on target devices. Message ID—CPWR0028, Severity—Warning, Category—Configuration Message—Unable to disable Emergency Power Reduction on the device because it is unreachable.
Temperature-Triggered EPR (Throttle) 5 Temperature-Triggered EPR (Throttle) Use Temperature-Triggered policy to prevent damage to devices due to overheating in the event of cooling infrastructure failure. It limits the processing capability of the devices in the group, hence reducing the possibility of any damage to device due to overheating.
Temperature-Triggered EPR (Throttle) Overheating due to the failure of cooling infrastructure Temperature-Triggered EPR (Throttle) applied by Power Manager 18 Emergency Power Reduction (EPR) feature with OpenManage Enterprise Power Manager
Temperature-Triggered EPR (Throttle) 5.1 Create Temperature-Triggered Policy To create a Temperature-Triggered policy, perform the following steps: 1. Login to OpenManage Enterprise and navigate to Power Management > Policies. 2. Click Create to launch the policy creation wizard. 3. Select the policy Type as Temperature-Triggered. Note: Modifying the type of policy after creation is not supported. Create Temperature-Triggered policy 4. Enter the policy name and description (optional).
Temperature-Triggered EPR (Throttle) Note: Both static and physical groups monitored in Power Manager are available for selection by default. Location details are displayed only for physical groups with group tag as Room, Aisle or Rack. Select Static or Physical Group to create Temperature-Triggered policy Note: Temperature-Triggered policy is supported only for groups monitored by Power Manager and if there is a minimum of one device added in the group.
Temperature-Triggered EPR (Throttle) Temperature threshold configuration in Policy Settings section ASHRAE Classes available for selection of Temperature Threshold Note: Scheduling a Temperature-Triggered policy is not supported, and the policy is always active after creation 7. Review the Summary section after providing the inputs for configuring Temperature-Triggered policy.
Temperature-Triggered EPR (Throttle) Review policy inputs from Summary section 8. After clicking Finish, a Temperature-Triggered policy is created and listed in Power Management > Policies page. Temperature-Triggered policy listed in policies tab Note: You cannot modify the type of policy created during an Edit action. 9. When the inlet temperature exceeds the configured temperature threshold value, the TemperatureTriggered policy with EPR Throttle option is applied on the group.
Temperature-Triggered EPR (Throttle) Temperature-Triggered EPR Throttle listed in Emergency Power Reduction tab Note: You cannot manually disable the EPR Throttle applied by virtue of a Temperature-Triggered policy. However, after the inlet temperature reduces Power Manager automatically removes the EPR.
Temperature-Triggered EPR (Throttle) Message ID—CPWR0050, Severity—Info, Category—Audit Message—The Emergency Power Reduction feature is successfully enabled on the group by using the temperature triggered policy . Note: Power Manager cannot apply Temperature-Triggered EPR (Throttle) when the group already has EPR (Throttle or Shutdown) applied manually or when all the devices monitored as part of the group has EPR (Throttle or Shutdown) applied individually.
Comparative study of Resource Utilization with EPR Throttle configured from Power Manager 6 Comparative study of Resource Utilization with EPR Throttle configured from Power Manager A comparative study was done to identify the overall power utilization for devices and groups when an EPR (Throttle) is applied from Power Manager. Tests have been performed by applying group level EPR Throttle on four PowerEdge R740 servers that are monitored as part of a Static Group in Power Manager.
Comparative study of Resource Utilization with EPR Throttle configured from Power Manager Power History details of a Static Group after applying EPR (Throttle) 26 Emergency Power Reduction (EPR) feature with OpenManage Enterprise Power Manager
Frequently Asked Questions 7 Frequently Asked Questions What is Max Power Conservation Mode (MPCM) in CMC? How is MPCM associated with Power Manager actions? When Maximum Power Conservation Mode is enabled on a chassis, all connected blade servers start functioning at their minimum power levels, and all subsequent server power allocation requests are denied. In this mode, the performance of powered on servers may be degraded. Additional servers cannot be powered on, regardless of the server priority.
Frequently Asked Questions Resolution: Disable EPR and remove static groups or devices from Power Manager. In case of Temperature-Triggered EPR (Throttle), disable or delete the corresponding Temperature-Triggered policy and retry the operation.
Frequently Asked Questions Can I rearrange devices in a Rack physical group with active EPR applied from Power Manager? Description: You can modify the rack slot(s) of selected device(s) (Manage Rack > Rearrange Rack > Update Rack Slots) even if there is an active EPR applied on the Rack physical group.
Frequently Asked Questions Corresponding audit log entries are available in Monitor > Audit Logs tab as follows. Message ID—CPWR0027, Severity—Info, Category—Configuration Message—The Emergency Power Reduction feature is successfully disabled on the target . Note: Behavior is the same even if there is an EPR effective on a Rack physical group (child) by virtue of the EPR applied in any parent groups as Datacenter, Room or Aisle.
Frequently Asked Questions What happens to the EPR applied on individual device level (EPR1) when the same device is added to a static group monitored in Power Manager and another EPR (EPR 2) is already applied or applied later on group level? Description: EPR applied at group level is not effective on the device, when the added device already has an EPR applied on it. For example, consider the following scenario: 1. Add two Power Manager capable devices (Device1, Device2) into Power Manager. 2.
Frequently Asked Questions What happens when an EPR is applied on a static or physical group, but all the member devices have EPR applied individually (from Power Management and Monitoring > Policies and EPR page)? Description: For example, consider the following scenario: 1. 2. 3. 4. Discover and add two Power Manager capable devices (Device1, Device2) into Power Manager. Apply EPR1 on Device1 and EPR2 on Device2. Create a Static or Physical Group and add both devices with active EPR’s to the group.
Frequently Asked Questions What happens to the EPR applied on a static group, when all devices are removed from a static group with active EPR? Description: EPR is maintained on device level when all devices are removed from a Static Group with active EPR. EPR applied on Static Group is listed in Power Management > Emergency Power Reduction tab and a red banner indicating EPR status and EPR Source is displayed in Group Details > Policies and EPR page of the Static Group.
Frequently Asked Questions Message displayed on deleting physical groups with active EPR Resolution: Disable EPR applied on the physical group and retry the operation. What happens when a device with active EPR is excluded or deleted from OpenManage Enterprise? Description: EPR is maintained in the device when a Power Manager monitored device is deleted or excluded from OpenManage Enterprise. EPR applied on the device is automatically removed from Power Management > Emergency Power Reduction tab.
Frequently Asked Questions Why is Throttle option not displayed after clicking Apply EPR from Power Management and Monitoring > Policies and EPR tab for a monitored PowerEdge server? Only Shut Down option is displayed after clicking Apply EPR for a device Resolution: EPR Throttle option is not available when the monitored device does not have a valid iDRAC Enterprise or Data Center License installed.
Frequently Asked Questions Can I apply EPR (Throttle) on an MX7000 chassis which is configured as a member in MCM mode? Description: EPR Throttle option is not available from Devices > Power Management and Monitoring > Policies and EPR tab and hence cannot be enabled directly on a MX7000 chassis which is added as a member in MCM group.
Frequently Asked Questions What happens to the EPR configured on a device when the OpenManage Enterprise Advanced license is expired or deleted? Description: If EPR is enabled on a group, and the license is expired or deleted for any device which is part of the group, the device is not removed from Power Manager. EPR remains on the target device. Behavior remains the same when EPR is applied on an Individual device and the license gets expired on the target device.
Technical Support and Resources 8 Technical Support and Resources • • • 8.1 Related Resources • • • • • 38 Dell.com/support is focused on meeting customer needs with proven services and support. To watch quick and short videos about handling the PowerEdge server components, visit the QRL video website. Storage technical documents and videos provide expertise that helps to ensure customer success on Dell EMC storage platforms.
