Server/DC-MHS

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Welcome[edit]

Welcome to the OCP Data Center – Modular Hardware System (DC-MHS) Sub-Project.

DC-MHS R1 envisions interoperability between key elements of datacenter, edge and enterprise infrastructure by providing consistent interfaces and form factors among modular building blocks.

DC-MHS R1 standardizes a collection of HPM (Host Processor Modules) form-factors and supporting ingredients to allow interoperability of HPMs and platforms.

There are six workstreams that comprise DC-MHS. The objectives of the six workstreams are the following:

  • M-HPM (Host Processor Modules) Workstream which involves three specifications:
    • M-FLW (FulL Width HPM)
      • Specify the requirements of a Full Width Host Processor Module (HPM). This is for use within products designed for minimum 19” rack, also known as compliant with EIA-310-E but can also accommodate larger 21” racks. This form factor enables a full width HPM usage for CPUs, DIMMs, and related features.
    • M-DNO (DeNsity Optimized HPM)
      • Outline the requirements of a family of partial width, DeNsity Optimized Host Processor Module (HPM) form factors within the OCP Modular 240 hardware system group of specifications (M-DNO for short). This M-DNO specification embodies design considerations for CPU, DIMMs, and other server processor related features commonly used by the industry today but is not limited to only those functions.
    • M-SDNO (Modular Hardware System Scalable DeNsity Optimized Specification)
      • Builds upon M-DNO, defines partial and full width HPMs with variable board outlines covering 19” EIA-310 and 21” OpenRack v3 infrastructure.
  • M-XIO/PESTI (eXtended I/O Connectivity/PEripheral SideBand Tunneling Interface)
    • Outline the Modular Extensible I/O (M-XIO) source connector hardware strategy. An M-XIO source connector enables entry and exit points between sources such as Motherboards, Host Processor Modules & RAID Controllers, and peripheral subsystems such as PCIe risers, backplanes, etc. M-XIO includes the connector, high speed and management signal interface details and supported pinouts. Additionally, the workstream defines Interface (M-PESTI) base requirements for electrical and protocol compatibility between components of a DC-MHS platform. The M-PESTI protocol overloads a common PRSNT# signal with additional capabilities beyond simple presence/absence of a peripheral.
  • M-PIC (Platform Infrastructure Connectivity)
    • Defines and standardizes common elements needed to interface a Host Processor Module (HPM) to the platform/chassis infrastructure elements/subsystems within the DC-MHS 1.0 family of OCP servers. Standardization of the common interfaces and connectors enables hardware compatibility between DC-MHS HPMs and various DC-MHS system components.
  • M-CRPS (Common Redundant Power Supply)
    • Defines all the requirements for an M-CRPS internal redundant power supply used in Open Compute Project that could be used in different environments like home/office, datacenter, and high-performance computing, hence harmonizing the server power supply requirements used in the industry with the purpose of creating a standard specification that the customers and vendors of Enterprise and Hyperscale can use for their products.
  • M-SIF (Shared InFrastructure)
    • Improve interoperability related to shared infrastructure enclosures with multiple, serviceable modules. Modules containing elements (HPMs, DC-SCM, peripherals, etc.) are blind-matable and hot-pluggable into a shared infrastructure enclosure.
  • M-PnP (Modular Plug and Play)
    • To ease system firmware and platform enablement integration. Defines interoperability for DC-MHS supporting systems to require and use industry standard processes using accepted algorithms and protocols to discover, manage, secure and maintain systems based on DC-MHS ingredients.


Disclaimer: Please do not submit any confidential information to the Project Community. All presentation materials, proposals, meeting minutes and/or supporting documents are published by OCP and are open to the public in accordance with OCP's Bylaws and IP Policy. This can be found on the OCP Policies page. If you have any questions please contact OCP.

Project Leadership[edit]

Sub-Project Leads[edit]


Spec. Authors[edit]


DC-MHS Wiki Administrator[edit]

Current Status[edit]

DC-MHS R1 v1.0 specs have been approved by the OCP Incubation Committee in November 2022.

DC-MHS workstreams are working the DC-MHS R1 v1.1 specifications. Note: M-SIF is a workstream new to DC-MHS. An early version of the M-SIF specification (version 0.5) is included in the Latest DC-MHS Specification section.

A link to a Readme file explaining how to use the following tables (Latest DC-MHS Specifications, Errata and Supporting Documentation, and Inactive Documents) is here: Link


Latest Released DC-MHS Specifications[edit]

Note: The Final Spec Agreement (FSA) for the latest specs has not yet been signed. You may access the released versions in the Contribution Database (Contribution Database).

Type Description Version Submit Date Contributor Link Notes
Specification M-CRPS Base Specification 1.04 RC3 2/22/24 Aurelio Rodriguez Echevarria RC3 Link

Mech Dwg

Update:
  • Updated typo in a dimension in the following mechanical drawings.
Specification M-SDNO Base Specification 0.7 RC3 1/29/2024 Brian Aspnes 0.7 Link Major Changes including Class C Definition and Class C/D Primary SCM/NIC moved for common chassis.
Specification M-XIO Base Specification 1.03 11/21/23 Javier Lasa 1.03 Link (non CB Version)

1.03 Link (CB version)

Updates:
  • Version 1.03 of the specification with and without change bar.
  • Changed pull-up from 127Kohm to 100Kohm on FLEXIO / CBL_PRES_PESTI_N topologies.
Specification M-SIF Base Specification 0.5 10/2/2023 Greg Sellman 0.5 Link (non CB Version)

0.5 Link (CB version)

Updates to high-speed IO & management interfaces. Connectors defined.
Specification M-PIC Base Specification 1.03 9/28/2023 Cliff DuBay 1.03 Link (non CB Version)

1.03 Link (CB version)

Updates:
  • SGPIO and PDB Management RFU
  • Cable Optimized boot connector rating & power control
  • I3C recommendations
  • SB - signal termination
Specification M-DNO Base Specification 1.01 RC2 7/20/2023 Mike Gregoire 1.01 RC2 Link (non CB Version)
1.01 RC2 Link (CB version)
Updates:
  • Updated tables, link1.01 RC2 Link (non CB Versions, pictures
Specification M-PESTI Base Specification 1.1 RC5 7/18/2023 Jeff Kennedy 1.1 RC5 Link (no change bar)
1.1 RC5 Link (CB Version)
Updates:
  • BAUD accuracy tolerance changed to +/-2%.
  • Overall clarification on the spec, general clean up.
  • Simplified payload headers and source to destination discovery examples.
  • See specification for detailed updates.
Specification M-FLW Base Specification v1.01 RC2 6/1/2023 Brian Aspnes 1.01 RC2 Link
1.01 RC2 Link (CB Version)
  • Fixes for date mismatches and Figure numbers.
  • Change bar version

Latest Released DC-MHS MCAD[edit]

Spec. Impacted Name Format Version Submit Date Contributor Link Notes
SDNO M-SDNO Class “A” Zip CAD Files Rev 0.7 STP CAD 1/22/24 Brian Aspnes Link Includes A305, A335, and A555.
SDNO M-SDNO Class “B” Zip CAD Files Rev 0.7 STP CAD 1/22/24 Brian Aspnes Link Includes B305, B335, and B555.
SDNO M-SDNO Class “C” Zip CAD Files Rev 0.7 STP CAD 1/22/24 Brian Aspnes Link Includes C305, C335, and C555.
SDNO M-SDNO Class “D” Zip CAD Files Rev 0.7 STP CAD 1/22/24 Brian Aspnes Link Includes D305, D335, and D555.
FLW T1 FLW STP CAD 5/23/2023 Brian Aspnes Link  
DNO DNO Type 4 MCAD STP CAD 2/15/23 Mike Gregoire DNO Type 4 Link Type 4 CAD
DNO DNO Type 3 MCAD STP CAD 10/26/22 Mike Gregoire Link Type 3 CAD Files
DNO DNO Type 2 MCAD STP CAD 10/26/22 Mike Gregoire Link Type 2 CAD Files

DC-MHS Tools[edit]

Spec. Impacted Name Format Version Submit Date Contributor Link Notes
CRPS make_mcrps_config_file Source Code 1.0 7/26/2023 Aurelio Rodriguez Echevarria Folder Link
[1]
M-CRPS Configuration file make tool, use CodeBlocks and GCC to compile the project. First release it only generates a .bin file from the header and the configuration area.


Errata and Supporting Documentation[edit]

This section includes Errata and ECNs that have not been moved into a public spec release yet (these files supersede anything in the current released specs).

Spec. Impacted Name Format Version Submit Date Contributor Link Notes
SDNO/FLW/DNO M-HPM 1033 Errata Document Document 1 2/21/2024 Mike Gregoire Link Corrected datum references when dimensioning 1033 riser locations which do not align with the released SFF-TA-1033 V1.0.
PIC M_PIC_R1_V1.03_Errata Document 1 2/1/2024 Cliff DuBay Link Errata # 1: Update the description and requirements for the FULL_PWR_CYCLE_N/FLEXIO pin to avoid power-up failures.
PIC Current Connector List Document 1 2/1/2023 Cliff DuBay Link M-PIC Connector List

Inactive Documents[edit]

This section includes Workstream specification errata and any other working documents.

Spec Impacted Name Format Version Submit Date Contributor Link Notes
CRPS M-CRPS Base Specification PDF 1.03 RC2 12/15/23 Aurelio Rodriguez Echevarria 1.03 RC2 Link

Mech Dwg

Update:
  • Multiple updates to many sections
  • Updated pictures and figures
  • Fixed typos
SNDO M-SDNO Base Specification PDF 0.5 10/2/2023 Brian Aspnes 0.5 Link Replaces the (Directional) M-DNO Specification Updates for HPM Types 5-7 0p3 RC2.pdf specification.
SDNO M-SDNO Class “A” Zip CAD Files STP 0.5 10/2/23 Brian Aspnes Link Includes A305, A335, and A555.
SDNO M-SDNO Class “B” Zip CAD Files STP 0.5 10/2/23 Brian Aspnes Link Includes B305, B335, and B555.
SDNO M-SDNO Class “D” Zip CAD Files STP 0.5 10/2/23 Brian Aspnes Link Includes D305, D335, and D555.
CRPS M-CRPS Base Specification PDF 1.02 RC2 8/23/2023 Aurelio Rodriguez Echevarria 1.02 RC2 Link

1.02 RC2 Mechanical Drawings

Update:
  • Multiple updates to many sections
  • Updated pictures and figures
(Directional) M-DNO Types 5-7 0p3 RC2 Updated CAD Files for Type 7 STP 1.0 6/1/23 Andrew Junkins Link Type 7 CAD Files - updated to match M-DNO v0.3 RC2 specification
(Directional) M-DNO Types 5-7 0p3 RC2 Updated CAD Files for Type 6 STP 1.0 5/16/23 Brian Aspnes Link Type 6 CAD Files
(Directional) M-DNO Types 5-7 0p3 RC2 Updated CAD Files for Type 5 STP 1.0 5/16/23 Brian Aspnes Link Type 5 CAD Files
(Directional) M-DNO Specification Updates for HPM Types 5-7 0p3 RC2 M-DNO Base Specification PDF v0.3 RC2 5/16/23 Mike Gregoire 0.3 Link (Directional) M-DNO Specification Updates for HPM Types 5-7
SIF M-SIF Base Specification PDF 0.3 3/29/2023 Dirk Blevins Link Early version (0.3) of the M-SIF specification
XIO M-XIO Base Specification PDF 1.02 3/16/2023 Javier Lasa Version 1.02
Link
Update:
  • Version 1.02 of the Specification with the Change Bar.
  • Added a compliance table.
PIC M-PIC Base Specification PDF 1.02 3/13/2023 Clifford DuBay Version 1.02
Link
Update:
  • Version 1.02 of the Specification with the Change Bar.
  • Improved compliance requirement visibility, clarified OR-ing requirement for +12V sources, & added contributors.
CRPS M-CRPS Base Specification PDF 1.01 RC2 7/26/2023 Aurelio Rodriguez Echevarria 1.01 RC2 Link
1.01 RC2 Mechanical Drawings
Update:
  • Integrated Errata
  • Updated pictures and figures
CRPS Errata PDF RC4 Rev 2 4/25/23 Aurelio Rodriguez Echevarria Link Corrections in Rev 1.0 RC4 of the M-CRPS specification.
CRPS Errata PDF RC4 Rev 1 4/3/2023 Aurelio Rodriguez Echevarria Link Fixes typos and drawing errors.
PIC M-PIC Base Specification PDF 1.01 2/3/2023 Clifford DuBay Version 1.01
Change Bar
  • Version 1.01 of the Specification with the Change Bar.
  • Update Figures and Tables, add Errata content, include Hot Plug information.
PIC M-PIC Errata 1 and 2 PDF 1.0 2/1/2023 Clifford DuBay Link
  • Errata 1: Update Section 9.1 to Avoid High Current in Partial-Mate Conditions
  • Errata 2: Update Section 9.1.7.6 to increase the Power Rating from 1080W to 2000W.
XIO M-XIO Base Specification PDF 1.01 RC1 1/24/2023 Javier Lasa Link Incorporated Errata #1. ECN: Addition of cable construction considerations, incorporated cable considerations (alignment with PCI-SIG internal cable spec), clarification on P3V3_MGMT usage.
XIO Errata PDF 1.0 12/12/2022 Javier Lasa Link Update SFF-TA-1016 and SFF-TA-1033 pinouts.
XIO M-XIO Specification PDF 1.0 RC4 9/28/2022 Javier Lasa Link Reviewed in Oct meeting. Approved by the IC on 11/4/2022
PESTI M-PESTI Specification PDF 1.0 RC2 9/28/2022 Javier Lasa Link Reviewed in Oct meeting. Approved by the IC on 11/4/2022
DNO M-DNO PDF 1.0 RC5 9/28/22 Michael Gregoire Link Reviewed in Oct meeting. Approved by the IC on 11/4/2022
FLW M-FLW Specification PDF 1.0 RC5 9/28/2022 Corey Hartman Link Reviewed in Oct meeting. Approved by the IC on 11/4/2022
CRPS M-CRPS Specification PDF 1.0 RC4 9/28/22 Aurelio Rodriguez Echevarria Link Reviewed in Oct meeting. Approved by the IC on 11/4/2022
PIC M-PIC Specification PDF 1.0 RC7 9/28/2022 Clifford DuBay Link Reviewed in Oct meeting. Approved by the IC on 11/4/2022

Get Involved[edit]


Communication[edit]


Meeting Schedule[edit]

For monthly public meetings:

  • Schedule is the third Wednesday of every month at 0800 PST.
  • Each workstream has its own weekly meeting for companies that have signed the DC-MHS R1 CLA.
  • OCP DC-MHS Project Calendar


Recordings from Past Monthly Meeting Calls[edit]

Presenter (Company) Title Recording Slides
DC-MHS Workstream Updates (Brian Aspnes, Mike Gregoire, Aurelio Rodriguez Echevarria, Corey Hartman, Dirk Blevins) February 2024 Public Call Recording Slides
DC-MHS Workstream Updates (Brian Aspnes, Mike Gregoire, Aurelio Rodriguez Echevarria, Greg Sellman, Dirk Blevins) January 2024 Public Call Recording Slides
DC-MHS Workstream Updates (Brian Aspnes, Mike Gregoire, Aurelio Rodriguez Echevarria, Greg Sellman) September 2023 Public Call Recording Slides
DC-MHS Workstream Updates (Brian Aspnes, Mike Gregoire, Aurelio Rodriguez Echevarria, Greg Sellman) August 2023 Public Call Recording Slides
DC-MHS HPM Workstream Updates (Brian Aspnes, Mike Gregoire, Javier Lasa, Aurelio Rodriguez Echevarria, Greg Sellman) Includes earlier OCP information on the Contribution Process for reference. July 2023 Public Call Recording Slides
OCP Contribution Process
DC-MHS HPM Workstream Updates (Brian Aspnes, Andy Junkins, Aurelio Rodriguez Echevarria) June 2023 Public Call Recording Slides
DC-MHS HPM Workstream Updates and New Spec (Corey Hartman, Mike Gregoire, Aurelio Rodriguez Echevarria) May 2023 Public Call HPM WS Update Recording HPM WS Update

New HPM Spec

DC-MHS HPM Workstream Update (Corey Hartman, Mike Gregoire) and Delta and Artesyn Representatives April 2023 Public Call Recording HPM WS Update

Artesyn Presentation

DC-MHS Workstream and Subproject Leads March 2023 Public Call Recording Slides

Slides/Recordings from October 2023 OCP Global Summit[edit]

There were a number of DC-MHS Technical Talks and Experience Center Lightning Talks at the October 2023 OCP Global Summit in San Jose. The presentations and recordings are posted below.

Presenter (Company) Title Recording Slides
Paul Artman (AMD)
Dirk Blevins (Intel)
Rob Nance (Jabil)
Design with DC-MHS Video Slides
Dirk Blevins (Intel)
Shawn Dube (Dell)
Vincent Nguyen (HPE)
Edge-MHS – Bringing Modular Hardware System to the Edge Video Slides
Cliff DuBay (Intel)
Shawn Dube (Dell)
DC-MHS - 48V Support Video Slides
Tim Lambert (Dell)
Javier Lasa (Intel)
Phillip Leech (HPE)
DC-MHS's Road to Off-the-shelf/Interchangeable HPMs Video Slides
Michael Gregoire (Dell)
Brian Aspnes (Intel)
Corey Hartman (Dell)
Matt Bowman (Meta)
Andrew Junkins (AMD)
Panel - DC-MHS: Updates and New Form Factors from the M-HPM Team Video Slides
Gregory D Sellman (AMD)
Dirk Blevins (Intel)
Damien Chong (Meta)
DC-MHS Modular Shared Infrastructure (M-SIF) - Comprehending Multi-Node/Host Video Slides
Tim Lambert (Dell)
Mike Witkowski (HPE)
Todd Rosedahl (IBM)
Javier Lasa (Intel)
DC-MHS: Peripheral Out-of-Band Management Evolution Video Slides
Jeff Kennedy (Dell)
Javier Lasa (Intel)
Eduardo Estrada (Intel)
DC-MHS, M-PESTI: What, Why and When to Use It. Video Slides
Aurelio Rodriguez Echevarria (Intel) DC-MHS: M-CRPS base specification and test setup updates Video Slides
Chitrak Gupta (AMI)
Justin Thaler (Jabil)
Enabling DC-MHS Design for Future Datacenters with Dynamic Firmware Video Slides
Munir Ahmad (Lattice)
Lawrence Lo (Intel)
Raghu Kondapalli (Axiado)
Driving DC-SCM innovations and interoperability - presented by DC-MHS Video Slides
Richard Caubang (Advanced Energy)
Austen Cook (Jabil)
Rob Nance (Jabil)
Aurelio Rodriguez Echevarria (Intel)
Cross Vendor Interoperability in Server Design and M-CRPS/Test board Demonstration Speakers - presented by DC-MHS Video Slides


Slides/Recordings from April 2023 OCP Regional Summit[edit]

Presenter (Company) Title Recording Slides
Dirk Blevins (Intel)
Paul Artman (AMD)
Rob Nance (Jabil)
Data Center Modular Hardware System (DC-MHS) Overview & Update Video Slides


Slides/Recordings from October 2022 OCP Global Summit[edit]

Presenter (Company) Title Recording Slides
Michael Leung (Google)
Aurelio Rodriguez Echevarria (Intel)
Corey Hartman (Dell)
Tim Lambert (Dell)
Eduardo Estrada (Intel)
PANEL: DC-MHS R1 report-out and timeline Recording Slides
Siamak Tavallaei (Google)
Brian Aspnes (Intel)
Shawn Dube (Dell)
Jean-Marie Verdun (HPE)
Dharmesh Jani (Meta)
PANEL: Datacenter Modular Hardware System (DC-MHS) Recording Slides
Dirk Blevins (Intel)
Todd Westhauser (Meta)
Vincent Nguyen (HPE)
Practical Usage of DC-MHS M-DNO Concepts Recording Slides
Siamak Tavallaei (Google)
Dirk Blevins (Intel)
Multi-host Modular Systems (M-SIF) Recording Slides


Slides/Recordings from April 2022 OCP Tech Talks[edit]

Presenter (Company) Title Recording Slides
Shawn Dube (Dell)
Brian Aspnes (Intel)
DC-MHS Rev 1.0: Introduction and Overview (Datacenter - Modular Hardware System) Recording Slides
Corey Hartman (Dell)
Brian Aspnes (Intel)
DC-MHS: FulL Width HPMs (M-FLW) Recording Slides
Mike Gregoire (Dell)
Dirk Blevins (Intel)
DC-MHS: DeNsity Optimized HPMs (M-DNO) Recording Slides
Cliff DuBay (Intel)
Tim Lambert (Dell)
DC-MHS: Peripheral Infrastructure Connectivity (M-PIC) Recording Slides
Charlie Ziegler (Dell)
Javier Lasa (Intel)
DC-MHS: eXtensible I/O (M-XIO) Recording Slides
Tim Lambert (Dell)
Javier Lasa (Intel)
DC-MHS: PEripheral Sideband Tunneling Interface (M-PESTI) Recording Slides
Aurelio Rodriguez (Intel)
Jon Lewis (Dell)
DC-MHS: Common Redundant Power Supply (M-CRPS) Recording Slides


OCP Marketplace Entries[edit]

The most recent documents will always be in the OCP Marketplace, Specifications & Design Collateral

or the OCP Marketplace, Orderable Products

Entries below are for ease of use and historical reference. Please use the marketplace links for the most recent documents.

Type Description Version Submit Date Contributor License Notes