HP ProLiant DL140 Dynamic Power Capping TCO and Best Practices White Paper (WW - Page 8

Table 3. HP ProLiant BL460c G5 Server Power and Costs Projections Faceplate Blade System Sizer (Enclosure) Load Testing and Dynamic Power Capping Enclosure Power 8,340 W 4,722 W 4,257 W w/16 Blade Servers Maximum Number of 16Blade Server* 28 Blade Servers 32 Blade Servers Blade Servers and 1 Enclosures 2 Enclosures 2 Enclosures Enclosures in Circuit Power Provisioning $13,438 $7,679 $6,719 Cost Per Server @ $25k per kW * While technically more than 16 blade servers will fit, the number of incremental servers does not justify the purchase of an additional enclosure. HP Note Tests assume a 30AMP, 208V 3-phase circuit for a usable total of 8.6kW of capacity. As with rack-mounted servers, customers who have used faceplate as their primary means of budgeting server power will see the most dramatic increase in servers per circuit and the most dramatic decrease in power provisioning cost per server. Since Dynamic Power Capping for blades is implemented within the blade enclosure and power budgets can be adjusted dynamically in response to workload requirements, many end-users will be able to reclaim additional power capacity by setting caps lower than the values suggested by the SpecJBB benchmark. In addition, because server workloads within the enclosure peak and decline at different rates, setting a cap below SpecJBB benchmark levels will probably result in little to no performance loss. There are a couple of other important observations to make when looking at the data in tables 1, 2, and 3. First, while the increase in number of server per circuit is very dramatic with the ProLiant DL380 G5, the overall number of blade servers deployed per circuit is still larger (32 blades for the BL460 G5 vs. 28 blades for the BL460 G1 vs. 23 servers for the DL380 G5). Power efficiency built into the c-Class blades in the form of pooled power, means that more blades can fit on a circuit even when Dynamic Power Capping is not used. Also, power reclamation potential is different based on different blade server models. Customers leveraging the 2 x 220 blade or the BL260c blade may find that they can reclaim more power and more dramatically increase server capacity than the numbers shown in this analysis might indicate. Best Practices for Implementing Dynamic Power Capping Establishing the dynamic power capping settings for your HP servers is an interactive process. It starts by leveraging tools such as the HP Power Calculator or HP BladeSystem Sizer to set Dynamic Power Capping baselines and culminates with refinement of Dynamic Power Capping settings based on actual power usage. The first portion of this section describes the Dynamic Power Capping configuration process for rack-mount servers using the ProLiant DL380 G5 server as an example. The second portion of this section described the same process for HP BladeSystem infrastructure using the ProLiant BL 460c G1 and G5 servers and the HP BladeSystem c7000 enclosure as examples. Dynamic Power Capping is part of HP Insight Control Environment. To begin using Dynamic Power Capping, go to the following URL, www.hp.com/go/ice and click buy online. This takes you to the 8