HP Power Advisor utility: a tool for estimating power requirements for HP ProLiant server systems technology brief Abstract.............................. 2 Introduction............................2 Key power parameters ........................2 Input line voltage.......................... 2 Device VA rating .......................... 2 Device input power........................3 BTUs required for cooling ......................3 Input/inrush current ........................
Abstract With power requirements of computing equipment increasing and the cost of energy rising, IT organizations need accurate estimates of power and cooling requirements for designing and expanding data centers. HP has created the HP Power Advisor utility to provide more accurate and meaningful estimates of power needs for HP ProLiant BL, DL, and SL systems so that IT infrastructure designers can determine the most efficient hardware configuration.
Device input power The amount of power a device turns into work and dissipates as heat is known as real (or true) power and is measured in watts (W). Since any heat created by electrical equipment must be extracted, knowing the total amount of watts dissipated by systems in a data center helps determine the cooling capacity needed in the facility.
the table of Figure 1, the total amperage and VA figures based on the nameplate ratings of the 750W power supply suggest that substantial power distribution components would be necessary, particularly if power redundancy is required. Figure 1. Rack loading with 20 ProLiant DL380 G6 servers using 750W power supplies (PSs) Nameplate Actual ratings-based...
HP Power Advisor The HP Power Advisor utility reduces the research and guesswork normally involved in determining power requirements for ProLiant-based systems. Using the HP Power Advisor, an IT administrator can build a complete system, component-by-component and rack-by-rack, assembling a complete infrastructure.
After selecting the line voltage, the user drags and drops the desired type of rack from the left pane (Figure 2) to the center area of the screen (Figure 3). This simple process is repeated for building a complete row of the same type of rack or a row of mixed rack types. Next, the racks are ready to populate with components.
Figure 4. HP Power Advisor, component configuration For servers that offer a choice of power supply nameplate ratings, the Power Advisor will automatically include a power supply capable of supporting 100 percent utilization, which is the default setting for any given server configuration. As discussed earlier in the “Achieving maximum efficiency”...
Figure 5. HP Power Advisor, BOM report The Power Advisor makes it possible to pre-calculate the running costs (cost of ownership) of the hardware based on the rate paid per kWh. By selecting the Power Report tab, the user can generate a Power Report (Figure 6) for a single server or a complete rack.
A Recommendations Report (Figure 7) is also available for each component. Based on the user- selected configuration for the highlighted server, the Power Advisor offers four types of recommendations: • General Purpose—configuration with best balance of performance, cost, and efficiency •...
Example power calculations The HP Power Advisor utility provides accurate calculations that planners can use to predetermine power requirements of a populated rack. This section includes three examples of a rack calculation: one for a standard 42U rack populated with HP ProLiant DL160 G6 servers, one for a standard 42U rack populated with HP ProLiant DL380 G6 servers, and one for a standard 42U rack populated with an HP c-Class BladeSystem.
While a standard 42U rack can physically accommodate 42 ProLiant DL160 G6 servers, it is advisable to allow space for server expansion, power distribution components, keyboard/video/mouse (KVM) equipment, or networking components. In Figure 9, Power Advisor calculates a single rack configured with 24 DL160 G6 servers. Figure 9.
Since the ProLiant DL160 G6 accommodates only one power supply, power redundancy will have to be provided upstream of the server’s single AC connection. Figure 10 shows a rack-level power redundancy scheme using an uninterruptable power supply (UPS). With four 7-outlet PDUs and a total input current capability of 5000 VA, the HP R5500 UPS would be a good fit and would provide adequate VA and outlet headroom for server expansion or peripheral devices.
Rack configuration with HP DL380 G6 servers This example describes a standard 42U rack configured with 20 HP DL380 G6 servers. For this calculation, each DL380 G6 server is configured with two Intel Xeon E5502 processors, 24 gigabytes of DDR3 memory, eight 120-GB SATA hard drives and two Smart Array Controller cards (Figure 11). Two 460-watt power supplies (set to run off 208 VAC) provide 1+1 power redundancy.
Figure 12. Power calculation for 20 HP DL380 G6 servers The Power Advisor determines that a rack configuration of 20 DL380 G6 servers would require the following: • 5761.6 VA total apparent power (20 x 288.08 VA) that the power distribution components must transfer •...
Figure 13 shows a rack configuration of twenty HP DL380 G6 servers receiving power through redundant power buses. This example is based on the Power Advisor calculations indicated in Figures 11 and 12. The power supplies (PS A and PS B) of each server connect through PDUs to the separate power buses.
Rack configuration with the HP c-Class BladeSystem The HP c-Class BladeSystem is a modular-based design that offers very flexible configuration possibilities. Therefore, the method for calculating BladeSystem installations is more involved than for DL systems. This example describes a standard 42U rack configured with four c7000 enclosures each loaded with 16 BL460c G6 server blades.
Highlight the enclosure in the rack and click Config. The enclosure configuration page appears as shown in Figure 15. Figure 15. Initial c7000 enclosure configuration screen NOTE The enclosure must be configured with a power supply and interconnect modules BEFORE adding and configuring the blades. Click the Config button.
In the left pane, click Servers and select a server blade. If the “Make all bays same as 1” option is selected (default), the Power Advisor will populate all blade slots of the enclosure with the selected blade (in this example, the BL460c G6 blade) as shown in Figure 17. Figure 17.
Check the voltage level indicated by the Power Advisor, reselect or change to 208 if necessary, and click Go. The Power Advisor will display the calculated power requirements for the rack with a single enclosure (Figure 19). Figure 19. Power calculation for a single c7000 enclosure with BL460c G6 server blades Additional enclosures are added to the rack by either duplicating a configured enclosure as described in the next step (9) or by selecting a new enclosure and configuring it as previously described in steps 3 through 8.
To duplicate an enclosure configuration, select the enclosure in the rack and click Duplicate. In the pop up window requesting for the number of copies, enter the desired value (for this example, enter 3). The Power Advisor will populate the rack with three additional enclosures of the same configuration as the first and calculate the total power requirements for the rack (Figure 20).
Conclusion The HP Power Advisor is a valuable utility for planning systems based on HP ProLiant products. The calculator provides meaningful estimates of power for use in sizing an infrastructure. It is important to note, however, that actual power consumption of an installed system running certain applications may vary.
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