In modern data center design, the most overlooked elements are power utilization, consumption and monitoring. Even when a data center is built out, thinking about power usage must always be at the forefront of any IT administrator’s mind. Making the right decisions can improve server health and data center efficiency. On the other hand, overlooking simple things, like monitoring data center power consumption, can have detrimental and costly effects on the environment. In this tip, you’ll learn some strategies to manage data center power.
Creating a power-conscious data center
The idea is simple: You can’t effectively manage what you can’t monitor. The only way to run a properly
Monitoring power consumption. A solid, overall view of data center power consumption requires monitoring all along the power system. An important task of power management is to understand and calculate the power usage effectiveness (PUE) of a data center. To do so, measurements should be taken at the UPS, which will then provide a base measure of data center power consumption. The measurements will then be used to calculate the PUE and identify energy usage trends. By monitoring the PDU, administrators can prevent certain overload conditions at the PDU level. By effectively monitoring aggregate PDUs, admins can also help ensure that power is evenly distributed across the facility. Arguably, the best view of data center power consumption will come from the power distribution units located within the racks. Modern rack-mounted PDUs feature integrated monitoring and control capabilities to enable continuous power monitoring. These PDUs are further configurable to send alerts and updates to a centralized management agent for data analysis.
Since rack and data center power consumption numbers vary based on the specific equipment within the infrastructure as well as the respective loads, each individual rack should be fitted with its own PDU. For some more advanced environments, power engineers recommend using two PDUs for dual-bus environments. Using two PDUs helps in two ways: It enables the capability of monitoring power consumption to the rack PDU and provides more overload-protected receptacle groups.
Collect volt, KW, KW/H and amp data along all points of the power supply chain – from outlet to rack to PDU – using a power management system. This creates an accurate picture of power use so you can see where your system isn't as effective as it could be. A modern rack PDU coupled with a room PDU should also help with IT chargeback and preventing overloads by allowing remote power management for individual outlets.
Monitoring energy efficiency. IT administrators know that energy costs can quickly consume a large proportion of a data center’s operating costs. Unfortunately, given the facts, many facilities still lack solid energy monitoring capabilities. The answer came from the industry in the form of centralized monitoring systems. Centralized monitoring systems, like the kinds from Emerson Electric Co. or Liebert, are available today that operate across the existing IT network or across a dedicated network. When creating a dedicated power monitoring environment, the suggested best practice is simple:
- Sites between 2000 and 3000 square feet generally choose to use the existing network infrastructure, rather than set up a separate network.
- Larger facilities with bigger data center requirements will benefit from a dedicated network. This can provide the ability to integrate with building automation and management systems, as well as manage multiple corporate sites.
Managing data center power does not have to be a manual process. Automating the collection process and then analyzing the data from the respective UPS and PDU monitoring systems can help reduce energy consumption by tracking efficiency. The other major benefit of having an automated system is increased IT productivity. Energy efficiency monitoring allows administrators to track total data center consumption, automatically calculate and analyze the PUE and further optimize the use of alternative energy sources. UPS devices carry a wealth of information. Monitoring systems can track UPS power output and determine when these units are running at peak efficiency. Using modern, power-conscious systems, even monitoring power at the panel is beneficial. Choose a system that checks power usage outside of the normal server and rack parameters, and looks at power consumption by non-IT systems, such as lighting and generators, to ensure the absolute best use of those systems.
Power monitoring tips and benefits
Numerous benefits exist for those businesses which properly monitor and manage power usage including lower energy costs, Energy Star and individual state rebates, Green certifications, better IT chargeback and a reduction of carbon footprint.
Remember, the little things can make all the difference when it comes to successful power consumption monitoring. Below is a short list of often-forgotten, power-critical components.
- Keep an eye on your server room temperatures: By installing network temperature sensors across a data center (within racks, exhausts, hot/cold isles, etc.) administrators can help ensure that their equipment is running within the ASHRAE recommended range (64.4 to 80.6 degrees Fahrenheit). With cooling in check, data center power consumption can also be normalized. This helps keep the servers running properly and keeps power costs down.
- Manage your alerts and alarms: Automated systems can help keep power usage in check and lead to a healthier environment. Create alerts and alarms so that administrators can take a proactive approach to a very important data center function--power management. By knowing a problem area before an actual issue arises, admins can take necessary actions to offload power or redistribute it as required.
- Keep your batteries healthy: The best way to help prevent data loss or server damage is to have a properly configured and healthy backup battery environment. A best practice is to implement a UPS or battery monitoring system that is able to connect to and track the health of each battery within a string. The most effective battery monitoring systems will continuously track all battery parameters, including internal resistance, which means using a DC test current to ensure measurement accuracy and repeatability. A good routine of preventive maintenance, battery replacement programs and UPS monitoring can help keep data centers and battery systems up and healthy, which will pay dividends when power disruptions occur.
About the expert: Bill Kleyman, MBA, MISM, is an avid technologist with experience in network infrastructure management. His engineering work includes large virtualization deployments as well as business network design and implementation. Currently, he is a virtualization architect at MTM Technologies Inc., a solutions provider based in Stamford, Conn.
This was first published in January 2012