DAOS Community Update / July'22

Lombardi, Johann

Hi there,


Please find below the DAOS community newsletter for July 2022.

A copy of this newsletter is available on the wiki.


Past Events

  • ISC’22 IXPUG (June 2nd at 9am CEST)

DAOS Features for Next Generation Platforms


Mohamad Chaarawi (Intel)

  • ESSA’22: 3rd Workshop on Extreme-Scale Storage and Analysis (June 3rd)

DAOS: Nextgen Storage Stack for HPC and AI


Johann Lombardi (Intel)

  • EMOSS’22: Emerging Open Storage Systems and Solutions for Data Intensive Computing (July 1st)

One big happy family: sharing the S3 layer between Ceph, CORTX, and DAOS

Zuhair AlSader (Seagate)
Andriy Tkachuk (Seagate)


Upcoming Events

  • Flash Memory Summit’22: 3rd Workshop on Extreme-Scale Storage and Analysis (August 2nd-4th)

Requirements and Challenges Associated with the World's Fastest Storage Platform


Jeff Olivier (Intel)



  • Current stable release is 2.0.2. See https://docs.daos.io/v2.0/ and https://packages.daos.io/v2.0/ for more information.
  • Branches:
    • release/2.0 is the release branch for the stable 2.0 release. Latest bug fix release is 2.0.2. 2.0.3 rc3 was tagged and rc4 is imminent.
    • release/2.2 is the development branch for the future 2.2 release. Latest test build is 2.1.103.
    • Master is the development branch for the future 2.4 release. Latest test build is 2.3.100.
  • Major recent changes on release/2.0 (bugfix release):
    • Fix a few client-side compilation issues on ARM64
    • Fix a segfault in bio with large single-value update
    • Fix several event-related issues causing client-side assertion during soak testing.
    • Several documentation improvements/clarifications
  • Major recent changes on release/2.2 (future 2.2 release):
    • All patches listed in the 2.0 section above.
    • Fix semaphore leak on pool addition failure
    • Add support for ucx+all alias
    • Limit UCX scanning to ib and tcp components.
    • Fix a few issues in incast variables
    • Build UCX in scons when building from source
    • Remove NVMe space reservation
    • Move dmg to new daos-admin RPM package
    • Fix bug in available NVMe space calculation used to support pool create with percentage-based space
    • Add support for EC conditional fetch (only used for metadata on EC)
    • Remove 1.2 compatibility code in daos_cont_create(). Container UUID cannot be provided by caller any longer.
    • Fix daos_event_abort_corruption issue
    • Check thread ID in interception descriptor
    • Remove dfuse user-space readahead entirely (readahead still done by the kernel)
  • Major recent changes on master (future 2.4 release):
    • All patches listed in the 2.2 section above.
    • Several clean-ups to prepare for EC parity rotation feature
    • Add SVM (shared virtual memory) support for QAT compression
    • Remove CentOS7 stage from CI pipeline
    • Update ubuntu to 22.04 in GitHub Action
    • User correct uid/git bits when creating files
    • Several build infrastructure (scons) improvements
    • Add EL9 docker file
    • Several server-side build fixes for ARM64
    • Limit DTX batched commit count.
  • What is coming:
    • 2.0.3 rc4 validation
    • 2.2.0 code freeze
    • 2.4.0 feature freeze



  • Major features under development:
    • Checksum scrubber
      • PR #9345 created out of the feature branch to land to master.
      • Soak and performance tests were run against the PR.
      • Exit criteria under view, merge to master is imminent.
      • Branch: feature/csum-scrubbing
      • Target release: 2.4
    • Multi-user dfuse
    • More aggressive caching in dfuse for AI APPs
    • I/O steaming function interception
      • Add the ability to intercept fopen/fclose/fread/fwrite and other streaming functions in the interception library.
      • Intercept missing ftello64 function.
      • Fix several bug discovered by daos_build test (i.e. building DAOS source code over FUSE/IL).
      • Test plan created.
      • PR: https://github.com/daos-stack/daos/pull/6939
      • Target release: 2.4
    • Catastrophic recovery
      • Aka distributed fsck or checker
      • ddb (low level debugger utility similar to debugfs for ext4) landed
      • Most of passes 2 and 3 implemented.
      • Testing for ddb and pass 1 in progress.
      • Branch: feature/cat_recovery
      • Target release: 2.6
    • Multi-homed network support
      • Aka multi-provider support
      • This feature aims at supporting multiple network provider in the engine
      • Incorporate new CART API to support bulk transfer from a second provider.
      • RPC dispatch to a second provider not supported yet.
      • Branch: feature/multiprovider
      • Target release: 2.6
    • Client-side metrics
    • Performance domain
      • Extend placement algorithm to be aware of fabric topology
      • Fix to avoid putting shards on the same domain landed
      • Branch: feature/perf_dom
      • Target release: 2.8 
    • LDMS plugin to export DAOS metrics
  • Pathfinding:
    • DAOS Pipeline API for active storage
    • Leveraging the Intel Data Streaming Accelerator (DSA) to accelerate DAOS
      • Prototype leveraging DSA for VOS aggregation delivered
      • Initial results shared at IXPUG conference.
    • OPX provider support in collaboration with Cornelis Networks
      • OPX provider merged upstream in libfabric
      • PR to add OPX support to mercury merged
      • Changes to DAOS to enable OPX as part of the build in progress
    • GPU data path optimizations
  • I/O Middleware / Framework Support



  • Thanks to Kevin Zhao for providing access to an ARM64 node that will be added soon as a self-hosted runner in GitHub action. This will allow the community to build & test DAOS on ARM64 on a regular basis.
  • A proposal for a DAOS community BoF at SC’22 has been submitted.


Intel Corporation SAS (French simplified joint stock company)
Registered headquarters: "Les Montalets"- 2, rue de Paris,
92196 Meudon Cedex, France
Registration Number:  302 456 199 R.C.S. NANTERRE
Capital: 5 208 026.16 Euros

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