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Hardware Management for Liquid Cooling

Overview of Progress

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HMLC - Cooling Profiles

Project Lead: Mick Jones

mick.jones@ocproject.net

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HMLC - Scope

  • Kicked off April 6th, 2022
  • Creation of a template and schema which supports all liquid cooling environments within OCP
  • Interface with Redfish DCIM taskforce and DMTF
  • Harmonize current requirements, whitepapers, specs and other documentation with work done in DMTF Thermal and Power management project
  • 6 months for initial deliverables
  • Longer period for whitepaper content and descriptive deliverables;
  • On-going (low intensity) content maintenance

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HMLC – What to manage?

  • Illustrative diagram of Liquid Cooling High Level topology
  • Does not illustrate all possible scenarios or interconnections

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HMLC - Progress

  • Full schema for all/any liquid cooling technology;
    • Immersion – Draft released Dec 2021
    • Door HX – In progress
    • Cold Plate – In progress
    • ACF – Pending
    • Heat Re-use - Pending
  • Message Registries; Events and Alarms - Pending
  • OCP Profile(s) - Pending
  • Requirements for qualification - Pending
  • Security requirements - Pending

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HMLC - Profiles

  • Profiles liquid cooling technology;
    • Door HX – Draft v0.5 exists at https://github.com/opencomputeproject/HWMgmt-OCP-Profiles/tree/master/RackAndPower
      • To be updated and version sync’ed with latest Redfish schema.
    • Cold Plate – In progress
    • CDU - Pending, maybe a separate profile TBD
    • ACF – Pending; maybe multiple profiles TBD
    • Heat Re-use - Pending
    • Immersion – Pending

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HMLC – Door Heat Exchanger

  • Door HX mapped to Redfish DCIM WIP schema for Thermal
  • Abridged - does not show upstream resources or resource connections

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Legend

  • A singleton resource
  • A collection of resources
  • A resource present in schema, but not relevant to Door HX

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https://drive.google.com/file/d/16IUmwhg0sMl3Br1QCwRet5wDjCcGLhYP/view?usp=sharing

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HMLC – Cold plate

  • Cold plate mapped to Redfish DCIM WIP schema for Thermal
  • Abridged - does not show upstream resources or resource connections

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Legend

  • A singleton resource
  • A collection of resources
  • A resource present in schema, but not relevant to Door HX

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https://drive.google.com/file/d/16IUmwhg0sMl3Br1QCwRet5wDjCcGLhYP/view?usp=sharing

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HMLC – Sensors

Sensors identified for Door HX; commonality to be established

  • Supply Temperature (coolant/air °C)
  • Return Temperature (coolant/air °C)
  • Fan speed (rpm)
  • State/Health (Redfish standard)
  • Valve position (on/off or %)
  • Flow rate (coolant l/s)
  • Pressure (Coolant or Δ air PA)
  • Leak detection
  • Particulate sensor (*subject to local regs)

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HMLC – Controls

Controls identified for Door HX; commonality to be established

  • Control Method (one of)
    • Diff air pressure
    • Outlet Air temperature
    • Return coolant temperature
    • Manual (cede control to upstream)
  • Power Control
    • Safety cut-off to ITE
  • Fan Speed
    • %
  • Coolant Valve
    • On/Off
    • % open

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Next Steps

  • Continue discovery for remaining sub-projects; ACF, Heat re-use
  • Collaborate with DMTF Redfish to complete and publish WIP schema
  • Publish mockups
  • Review/Iterate/Approve schema and mockups
  • OCP Profiles and qualification requirements
  • Security requirements

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Q&A

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