2008 09-16-presentation

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  • 2008 09-16-presentation

    1. 1. Uptime Institute - Tiers
    2. 2. Uptime Institute
    3. 3. Typical Data Center Power Utility Power HVAC Panel Automatic Transfer Switch UPS Generator Power CRAC Units Dist. Panel PDU’s Dist. Data Center Servers
    4. 4. What Could Fail? Utility Power HVAC Panel Automatic Transfer Switch UPS Generator Power CRAC Units Dist. Panel PDU’s Dist. Data Center Servers Power Sources Crash Crash Single Points of Failure
    5. 5. Risk Avoidance <ul><li>How to Mitigate Risk: </li></ul><ul><li>Design to eliminate Single Points of Failure (SPOF). </li></ul><ul><li>Provide redundant electrical power paths from the utility and emergency backup system down to each server wherever possible. </li></ul><ul><li>Provide methods to allow Preventative Maintenance (PM) for every aspect of the electrical distribution system without causing or risking an outage to the IT equipment. </li></ul><ul><li>Provide at least an N+1 HVAC system allowing for the loss or PM of any single Computer Room Air Conditioning (CRAC) unit without causing overheating of the Data Center. </li></ul><ul><li>Create Standard Operating Procedures (SOP) to reduce access to the data center and to maintain operational data for all aspects of the data center equipment. </li></ul>
    6. 6. The Objective <ul><li>Powering and Cooling to what Matters: </li></ul><ul><li>The redundant data center infrastructure supports tiny microprocessors </li></ul><ul><ul><li>Intel’s Core Quad rated for 75W </li></ul></ul><ul><ul><li>Very small footprint: 1.5” x 1.5” </li></ul></ul><ul><ul><li>Extreme density at chip level </li></ul></ul><ul><li>This is what we power </li></ul><ul><li>This is what we cool </li></ul>
    7. 7. Redundant Cooling Systems <ul><li>Main Cooling System Components </li></ul><ul><ul><li>Redundant Power Supply to Cooling Equipment </li></ul></ul><ul><ul><ul><li>No Single Point of Power Failure </li></ul></ul></ul><ul><ul><li>Redundant Heat Rejection </li></ul></ul><ul><ul><ul><li>Condensers, Cooling Towers or Dry Coolers </li></ul></ul></ul><ul><ul><li>Redundant Pumps </li></ul></ul><ul><ul><ul><li>Minimum N+1 Pumps </li></ul></ul></ul><ul><ul><li>Redundant CRAC Units </li></ul></ul><ul><ul><ul><li>Recommended N+20% CRAC Units </li></ul></ul></ul>
    8. 8. Investigation Methods <ul><ul><li>Air Delivery Model: </li></ul></ul><ul><ul><li>Computational Fluid Dynamics (CFD) Model </li></ul></ul><ul><ul><li>Determine individual rack loads (kW / Rack) </li></ul></ul><ul><ul><li>Identify individual rack characteristics </li></ul></ul><ul><ul><ul><li>Air flow through rack (F-R, F-T, B-T, F&B-T) </li></ul></ul></ul><ul><ul><ul><li>Pass through air through cable openings </li></ul></ul></ul><ul><ul><ul><li>Open U’s within racks </li></ul></ul></ul><ul><ul><li>Investigate total kW output of UPS equipment </li></ul></ul><ul><ul><li>Identify cooling system components </li></ul></ul>
    9. 9. Investigation Methods – Cont. <ul><ul><li>Locate each CRAC unit and identify model and set points </li></ul></ul><ul><ul><li>Locate each PDU and identify kVA and heat loss </li></ul></ul><ul><ul><li>Locate the under floor (supply plenum) obstructions </li></ul></ul><ul><ul><ul><li>Cable tray, conduit, piping, etc. </li></ul></ul></ul><ul><ul><li>Locate each floor diffuser and the percentage of opening </li></ul></ul><ul><ul><li>Locate any obstructions within the room </li></ul></ul><ul><ul><li>Investigate ceiling for use as return plenum </li></ul></ul><ul><ul><li>Review findings with AIG to confirm input to model </li></ul></ul>
    10. 10. The Supply Air Plenum <ul><ul><li>Plenum Air Velocity: The speed of the air as it leaves the CRAC units and reaches the floor diffusers. </li></ul></ul><ul><ul><li>Plenum Pressure: The static pressure produced by the CRAC unit air supply and the affect of the floor openings. </li></ul></ul><ul><ul><li>Supply Diffusers: Located in cold aisle to direct air to IT equipment / racks. </li></ul></ul><ul><ul><li>Pass Through Air: Any air passing through the floor not used to cool the IT equipment. </li></ul></ul>
    11. 11. Provide Air to Entire Rack - Evenly <ul><li>The supply plenum delivers air through the floor. </li></ul><ul><li>The air must have enough velocity to reach the top server in the rack </li></ul><ul><li>Effect of pass through air from cable cutouts </li></ul><ul><ul><li>Decreases plenum pressure </li></ul></ul><ul><ul><li>Decreases air velocity through floor tiles </li></ul></ul><ul><li>More pass through air mean less air in the cold Aisle </li></ul><ul><li>Air does not reach the equipment at the top of rack. </li></ul><ul><li>Hot Aisle / Cold Aisle neutralized. </li></ul>
    12. 12. Temperature X Axis
    13. 13. Temperature Z Axis
    14. 14. Thermal Cloud The next slide show the air temperature ranges as a thermal cloud. Thermal cloud: A volume of air that is all the same temperature. Low Temp. Thermal Cloud: The first cloud represents the coldest area of the data center. This is the area where air is over delivered. It is also the best area to install new equipment. Average Temp. Thermal Cloud: The second cloud represents the area of the data center that is 70 degrees F. This cloud should be in the hot aisles near the ceilings and in areas that do not require cooling.
    15. 15. Low Temp. Thermal Cloud No Hot Aisle/ Cold Aisle – all Aisles cold Wasted Air from over-delivery
    16. 16. Proper Data Center Airflow Server Racks Air Diffuser Grill Floor Plenum Ceiling Plenum Hot Air Cold Air Return Air Grill Cold Air
    17. 17. Cable Cutouts in Raised Floor
    18. 18. Effect on Air Flow From Cutouts Wire Cutouts Cool Air Air Velocity Decreases Cold Air Not Used Top Server Hot
    19. 19. Return to Optimum Airflow Wire Cutouts Patched Hot Aisle Maintained Top Server Receives Cooling Air Velocity Back to Normal
    20. 20. Proper Data Center Airflow Server Racks Air Diffuser Grill Floor Plenum Ceiling Plenum Hot Air Cold Air Return Air Grill Cold Air
    21. 21. Effects of Open U’s in Rack Floor Plenum Ceiling Plenum Warm Air Cold Air Air Velocity Decreases Top Server Hot Cold Air Not Used
    22. 22. Blanking Panel Installed
    23. 23. Return to Optimum Airflow
    24. 24. Opportunities for Optimization <ul><li>Establish Cold Aisle/Hot Aisle best practices </li></ul><ul><li>Eliminate Pass Through Air from cable cut outs </li></ul><ul><li>Provide blanking panels for unused U’s in Rack </li></ul><ul><li>Reduce air disruption in supply plenum – remove unused wiring from under floor </li></ul><ul><li>Increases static pressure under the raised floor and improves cool air delivery through perforated tiles </li></ul><ul><li>Determine required CFM requirements for each rack </li></ul><ul><li>Provide proper air flow to racks </li></ul><ul><li>Position floor diffusers for proper airflow </li></ul><ul><li>Tune the air supply to the air requirements </li></ul>

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