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PC Racks - Status

PC Racks - Status. Content News, matters arising Last Experiment meeting ( 24/08 ) – Minutes to come Presentation at the 10 th Elect. Workshop for LHC (Boston - 13-17 /09 ): F.Wickens draft talk on: http://fjw.home.cern.ch/fjw/LECC04/

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PC Racks - Status

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  1. PC Racks - Status Content • News, matters arising • Last Experiment meeting (24/08) – Minutes to come • Presentation at the 10th Elect. Workshop for LHC (Boston - 13-17 /09): • F.Wickens draft talk on: http://fjw.home.cern.ch/fjw/LECC04/ • Feed back on content, author list,.. (Experiments, PH-ESS, TS-EL) • Experiment status (Y.E: Atlas, A.R: CMS, Ph.G: LHCb, Alice: ?) • Towards to actually install PC racks: • Review of experiment's milestones • Rackcoolers ordering • Powering, packaging,.. solutions Rack Coordination meeting Ph.Gavillet CERN/PH-LBO

  2. Status of LHCb PC Farm prototype PC rack configuration • 2 * Subfarm / 59U rack • Each rack • 1 * rackcooler CIAT • 1 elec. Dist. box (1phase :63A) • 1 * 48-port Control switch • Each Subfarm • 3 * 9-outlet reglettes (16A) • 23 * PCs • 1 * 24-port Data switch Rack Coordination meeting Ph.Gavillet CERN/PH-LBO

  3. Status of LHCb PC Farm prototype Powering tests (06/07) • TS-EL (J.Pierlot) • Test 1: TDM drawer: 63A on each phase - Circuit breaker (60A, C-curve) • PC rack powered on one phase only • 6 departs supplying one reglette each (10A, 9 outlets) • One (16A, C-curve) circuit breaker / depart • Results: • OK, as long as the off time of the PCs is short (< a few mins) • Explanation: after a short shutoff the various capacitors are still • partially loaded hence the inrush extra current is lower • Test2: TDM circuit breaker (60A, D-curve) • Results: OK repeatedly • D-curve would protect up to 10*In (~600A) inrush current • Conclusion:currentFarm prototype can be powered in one go Rack Coordination meeting Ph.Gavillet CERN/PH-LBO

  4. Status of LHCb PC Farm prototype Characterization of LV supply (K.Kahle) • LV measurements (06/08: K.Kahle, J.Pierlot-TS-EL) • Measurements of new PC types (Melrow) • 2.8 GHz: 225-240 W, 3.06 GHz: 270W • Features: new PWS type from Zippy, Delta (China) (IBM,..) • Results (preliminary) • New PCs show similar inrush current (<20A) • Full rack measurement • At power up • At 100% CPU load • TS-EL Technical note to be issued Rack Coordination meeting Ph.Gavillet CERN/PH-LBO

  5. Status of LHCb PC Farm prototype Outlook (short term) • Follow up of LV • Get recommendations from K.Kahle’s report • Work out with TS-EL specifications of LV supply • Transformer • Circuit breaker protection • Neutral rating • Complete cooling measurements on full configuration • Power in / Power out balance • Map of temperatures: In / behind PCs / Out Rack Coordination meeting Ph.Gavillet CERN/PH-LBO

  6. Towards actually installing PC racks Experiment’s milestones / Ordering of equipment • Review experiments milestones • Installation of PC racks fromSpring 2005on • Information from CIAT • Price quotation for rackcooler (alone, rack included) • Review of specifications: ~ 3 weeks (17/09/04) • Price enquiry: ~ 5-6 weeks • Fabrication: ~ 5-6 weeks • Delivery: per batch of 40-50 units • Actual rack installation/test ~ 2-3 weeks • Powering, packaging,.. common solutions • Seems more experiment specific • Different rack size i.e # number of PCs / rackpowering schemes • Different access constraints • Common contacts to industry (PGEP,..) • Keep exchanging all useful infos Rack Coordination meeting Ph.Gavillet CERN/PH-LBO

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