daos-stack/daos
Nov 2024 – Mar 2026
16 Months active
Languages Used
CGoMarkdownprotobufBashC++MakefilePython
Technical Skills
API DesignCLI DevelopmentDistributed SystemsDocumentationProtocol BuffersStorage Management
Tom Nabarro
PROFILE
Tom Nabarro
Tom Nabarro contributed to the daos-stack/daos repository by engineering robust storage management and control plane features over 16 months. He developed and enhanced backend systems for pool management, self-healing automation, and memory optimization, applying Go, C, and Python to improve reliability and operational clarity. Tom’s work included CLI and API design for distributed storage operations, secure server-to-server authorization, and resilient error handling. He addressed complex issues in device management, configuration, and testing, delivering solutions that reduced operational risk and improved maintainability. His technical depth ensured scalable, production-ready workflows for large-scale deployments, with thorough documentation and test coverage.
Overall Statistics
Feature vs Bugs
63%Features
Repository Contributions
67Total
Bugs
18
Commits
67
Features
30
Lines of code
48,016
Activity Months16
Your Network
2053 peopleSame Organization
@intel.com1996
Work History
March 2026
4 Commits • 1 Features
Mar 1, 2026March 2026 (2026-03) monthly summary for daos-stack/daos: Focused on stabilizing hardware interactions, robustness of container tooling, and fault-management UX. Key outcomes include preventing NVMe driver unbinding in VMD mode when a blocklist is present, fixing segmentation faults in non-POSIX container queries with added unit tests, centralizing LED state management for device fault detection, and silencing noisy errors when rank is uninitialized during RAS events. These changes reduce production risk, improve observability, and streamline maintenance efforts.
4 Commits • 1 Features
Mar 1, 2026March 2026 (2026-03) monthly summary for daos-stack/daos: Focused on stabilizing hardware interactions, robustness of container tooling, and fault-management UX. Key outcomes include preventing NVMe driver unbinding in VMD mode when a blocklist is present, fixing segmentation faults in non-POSIX container queries with added unit tests, centralizing LED state management for device fault detection, and silencing noisy errors when rank is uninitialized during RAS events. These changes reduce production risk, improve observability, and streamline maintenance efforts.
March 2026
February 2026
10 Commits • 3 Features
Feb 1, 2026February 2026 (daos-stack/daos): Implemented SPDK/Engine configurability and reliability enhancements, plus default hugepages behavior and updated docs. Delivered configurable SPDK override flag, SPDK I/O buffer pool tuning, NVMe power management via environment variable, and environment-driven SPDK/DPDK log levels; set default scm_hugepages_disabled to true; improved pool management with joined-ranks sizing, AdminExcluded rejoin after storage reformat, and retry for self-heal; updated docs to remove deprecated nvme-add-device usage and clarify that format --replace handles AdminExcluded state. Business value: safer high-performance tuning, reduced pool creation failures, clearer ops guidance, and more robust self-heal and reconfiguration workflows across DAOS deployments.
February 2026
10 Commits • 3 Features
Feb 1, 2026February 2026 (daos-stack/daos): Implemented SPDK/Engine configurability and reliability enhancements, plus default hugepages behavior and updated docs. Delivered configurable SPDK override flag, SPDK I/O buffer pool tuning, NVMe power management via environment variable, and environment-driven SPDK/DPDK log levels; set default scm_hugepages_disabled to true; improved pool management with joined-ranks sizing, AdminExcluded rejoin after storage reformat, and retry for self-heal; updated docs to remove deprecated nvme-add-device usage and clarify that format --replace handles AdminExcluded state. Business value: safer high-performance tuning, reduced pool creation failures, clearer ops guidance, and more robust self-heal and reconfiguration workflows across DAOS deployments.
January 2026
4 Commits • 3 Features
Jan 1, 2026January 2026 (2026-01) monthly summary for daos-stack/daos: Implemented scalable timeout for damage pool operations based on ranks to improve efficiency and resource handling for large pools; enhanced pool rebuild status with intermediate derived_state indicators and accompanying tests to provide administrators with precise visibility during rebuild; introduced RAS event generation for LED state changes in non-VMD configurations to improve drive monitoring when hardware LEDs cannot be controlled directly; plus test coverage improvements and a targeted fix to ListVerbose behavior to maintain accurate status reporting. These changes deliver measurable business value through better performance, reliability, and operational clarity for large-scale deployments.
4 Commits • 3 Features
Jan 1, 2026January 2026 (2026-01) monthly summary for daos-stack/daos: Implemented scalable timeout for damage pool operations based on ranks to improve efficiency and resource handling for large pools; enhanced pool rebuild status with intermediate derived_state indicators and accompanying tests to provide administrators with precise visibility during rebuild; introduced RAS event generation for LED state changes in non-VMD configurations to improve drive monitoring when hardware LEDs cannot be controlled directly; plus test coverage improvements and a targeted fix to ListVerbose behavior to maintain accurate status reporting. These changes deliver measurable business value through better performance, reliability, and operational clarity for large-scale deployments.
January 2026
December 2025
10 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for daos-stack/daos: Delivered targeted memory management and fault-tolerance enhancements, startup safety improvements, and admin tooling support, driving higher performance, reliability, and operational efficiency. Key work included memory management enhancements with default auto-faulty reaction and increased RAM reservation for high-performance configurations; THP-based startup safety enforcement; system property exposure and improved directory permissions for offline tooling; API reliability improvements for per-pool operations with proper hostlist propagation; pool rebuild state enum alignment; and expanded documentation and testing (prov_mem usage, tests, and coverage).
December 2025
10 Commits • 3 Features
Dec 1, 2025December 2025 monthly summary for daos-stack/daos: Delivered targeted memory management and fault-tolerance enhancements, startup safety improvements, and admin tooling support, driving higher performance, reliability, and operational efficiency. Key work included memory management enhancements with default auto-faulty reaction and increased RAM reservation for high-performance configurations; THP-based startup safety enforcement; system property exposure and improved directory permissions for offline tooling; API reliability improvements for per-pool operations with proper hostlist propagation; pool rebuild state enum alignment; and expanded documentation and testing (prov_mem usage, tests, and coverage).
November 2025
3 Commits • 3 Features
Nov 1, 2025November 2025: Key DAOS stack accomplishments focused on reliability, security, and usability improvements in the daos control module. Delivered three major capabilities, with associated test and security hardening work: - Self-Heal Reliability and Test Coverage Improvements: expanded unit test coverage for self-heal functionality, increasing reliability and robustness in the DAOS control module. (DAOS-18128) [Commit: 349c27b6a5d8ca29723a28facf05ab8da3877fd1] - Secure Server-to-Server Authorization for Dmg System Commands: added explicit ComponentServer authorizations for server-to-server dmg system commands to secure communications when certificates are used. (DAOS-18198) [Commit: 54cdcd6e409da20a1f1eb807093e936cb9724ed5] - Bracketed RankSet Input Support: enables handling of bracketed strings in CreateRankSet, with added tests and validation for bracketed and non-bracketed input. (DAOS-18201) [Commit: 3d8f848623a851914799d3fc19e398b81c51e117]
3 Commits • 3 Features
Nov 1, 2025November 2025: Key DAOS stack accomplishments focused on reliability, security, and usability improvements in the daos control module. Delivered three major capabilities, with associated test and security hardening work: - Self-Heal Reliability and Test Coverage Improvements: expanded unit test coverage for self-heal functionality, increasing reliability and robustness in the DAOS control module. (DAOS-18128) [Commit: 349c27b6a5d8ca29723a28facf05ab8da3877fd1] - Secure Server-to-Server Authorization for Dmg System Commands: added explicit ComponentServer authorizations for server-to-server dmg system commands to secure communications when certificates are used. (DAOS-18198) [Commit: 54cdcd6e409da20a1f1eb807093e936cb9724ed5] - Bracketed RankSet Input Support: enables handling of bracketed strings in CreateRankSet, with added tests and validation for bracketed and non-bracketed input. (DAOS-18201) [Commit: 3d8f848623a851914799d3fc19e398b81c51e117]
November 2025
October 2025
4 Commits • 2 Features
Oct 1, 2025Concise monthly summary for 2025-10 focusing on the daos-stack/daos repo. Delivered self-heal automation and governance enhancements with notable reliability and visibility improvements. Key features delivered: - Self-Heal Evaluation CLI: Added dmg system self-heal eval command with server-side handling by the MS-leader, including engine exclusion logic and cross-service reevaluation. - Self-Heal Policy Visibility in Management Plane: Enhanced visibility for self-heal policies via system and pool queries, displaying flags and policy options; updated protobufs and response structures. Major bugs fixed: - Self-Heal Property Exclude Flag Correctness: Prevented incorrect exclusions caused by SWIM dead events; updated protobuf definitions and internal system-property logic. Overall impact and accomplishments: - Enabled automated, server-side reevaluation of self-heal across relevant services; improved reliability and policy governance; reduced misconfiguration risk and operator toil; enhanced operator visibility through improved queries and responses. Technologies/skills demonstrated: - dmg CLI enhancements, dRPC-based server coordination, MS-leader orchestration, protobuf updates, CA RT/SWIM integration, and enhanced system/pool management queries.
October 2025
4 Commits • 2 Features
Oct 1, 2025Concise monthly summary for 2025-10 focusing on the daos-stack/daos repo. Delivered self-heal automation and governance enhancements with notable reliability and visibility improvements. Key features delivered: - Self-Heal Evaluation CLI: Added dmg system self-heal eval command with server-side handling by the MS-leader, including engine exclusion logic and cross-service reevaluation. - Self-Heal Policy Visibility in Management Plane: Enhanced visibility for self-heal policies via system and pool queries, displaying flags and policy options; updated protobufs and response structures. Major bugs fixed: - Self-Heal Property Exclude Flag Correctness: Prevented incorrect exclusions caused by SWIM dead events; updated protobuf definitions and internal system-property logic. Overall impact and accomplishments: - Enabled automated, server-side reevaluation of self-heal across relevant services; improved reliability and policy governance; reduced misconfiguration risk and operator toil; enhanced operator visibility through improved queries and responses. Technologies/skills demonstrated: - dmg CLI enhancements, dRPC-based server coordination, MS-leader orchestration, protobuf updates, CA RT/SWIM integration, and enhanced system/pool management queries.
September 2025
6 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for daos-stack/daos. This period focused on expanding rebuild administration capabilities and hardening engine/storage reliability to improve admin productivity and system resilience. Key features and fixes delivered with direct business value include: 1) DAOS dmg rebuild command enhancements enabling pool-level and system-wide rebuilds with updated CLI syntax, protocol changes, and integration with existing ds_mgmt_pool_rebuild_start/stop APIs; 2) Engine/storage robustness fixes including restoration of pool map change logging, corrected lock cleanup order on engine exit in MD-on-SSD mode, SPDK lockfile handling around local scans, and improved PMem discovery handling when unavailable; 3) Observability improvements and safer rebuild workflows to reduce operational risk during maintenance and scale across systems; 4) Demonstrated skills in distributed storage tooling, CLI/dRPC/protobuf, lockfile hygiene, and PMem/MD-on-SSD considerations for production reliability.
6 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for daos-stack/daos. This period focused on expanding rebuild administration capabilities and hardening engine/storage reliability to improve admin productivity and system resilience. Key features and fixes delivered with direct business value include: 1) DAOS dmg rebuild command enhancements enabling pool-level and system-wide rebuilds with updated CLI syntax, protocol changes, and integration with existing ds_mgmt_pool_rebuild_start/stop APIs; 2) Engine/storage robustness fixes including restoration of pool map change logging, corrected lock cleanup order on engine exit in MD-on-SSD mode, SPDK lockfile handling around local scans, and improved PMem discovery handling when unavailable; 3) Observability improvements and safer rebuild workflows to reduce operational risk during maintenance and scale across systems; 4) Demonstrated skills in distributed storage tooling, CLI/dRPC/protobuf, lockfile hygiene, and PMem/MD-on-SSD considerations for production reliability.
September 2025
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for daos-stack/daos focused on enhancements to pool configuration ergonomics and memory-management stability. Delivered a CLI enhancement to support multi-value pool properties via semicolon-separated strings, including updates to argument parsing, command definitions, tests, and property mapping to enable multi-value properties such as self_heal. Fixed a critical nvme-rebind issue to preserve hugepage allocations across NUMA nodes by adjusting the prepare request and helper logic, improving stability during rebind operations. These efforts reduce configuration toil, minimize downtime during maintenance, and improve reliability in NUMA-aware deployments.
August 2025
2 Commits • 1 Features
Aug 1, 2025August 2025 monthly summary for daos-stack/daos focused on enhancements to pool configuration ergonomics and memory-management stability. Delivered a CLI enhancement to support multi-value pool properties via semicolon-separated strings, including updates to argument parsing, command definitions, tests, and property mapping to enable multi-value properties such as self_heal. Fixed a critical nvme-rebind issue to preserve hugepage allocations across NUMA nodes by adjusting the prepare request and helper logic, improving stability during rebind operations. These efforts reduce configuration toil, minimize downtime during maintenance, and improve reliability in NUMA-aware deployments.
July 2025
7 Commits • 3 Features
Jul 1, 2025July 2025 monthly summary focusing on deliverables, stability, and value across the daos-stack/daos repository. Highlights include memory management improvements for startup memory usage and per-NUMA insights, configuration safety enhancements, and reliability improvements in Raft and JSON parsing.
7 Commits • 3 Features
Jul 1, 2025July 2025 monthly summary focusing on deliverables, stability, and value across the daos-stack/daos repository. Highlights include memory management improvements for startup memory usage and per-NUMA insights, configuration safety enhancements, and reliability improvements in Raft and JSON parsing.
July 2025
June 2025
2 Commits
Jun 1, 2025June 2025 monthly summary for repository daos-stack/daos: Delivered two targeted bug fixes focused on resource management and setup reliability in the engine lifecycle, enabling stable operation during SIGKILL terminations and after source-build changes. These changes improve storage operation reliability, reduce resource leaks, and streamline deployment.
June 2025
2 Commits
Jun 1, 2025June 2025 monthly summary for repository daos-stack/daos: Delivered two targeted bug fixes focused on resource management and setup reliability in the engine lifecycle, enabling stable operation during SIGKILL terminations and after source-build changes. These changes improve storage operation reliability, reduce resource leaks, and streamline deployment.
May 2025
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for daos-stack/daos: Key documentation improvements delivered for the dmg pool admin workflow, focusing on operational clarity for admins and safer pool rank rejoin processes. The work enhances onboarding and reduces misconfig risks during maintenance tasks.
1 Commits • 1 Features
May 1, 2025May 2025 monthly summary for daos-stack/daos: Key documentation improvements delivered for the dmg pool admin workflow, focusing on operational clarity for admins and safer pool rank rejoin processes. The work enhances onboarding and reduces misconfig risks during maintenance tasks.
May 2025
April 2025
2 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for daos-stack/daos focused on reliability and developer experience in pool management. Delivered targeted tests for type conversion and refreshed administration guidance to reflect new workflow commands and options. No major bugs fixed this period.
April 2025
2 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary for daos-stack/daos focused on reliability and developer experience in pool management. Delivered targeted tests for type conversion and refreshed administration guidance to reflect new workflow commands and options. No major bugs fixed this period.
March 2025
3 Commits • 3 Features
Mar 1, 2025Month: 2025-03 — Delivered three high-impact enhancements to the DAOS control plane, improving multi-rank management, safety, and recovery capabilities. The changes reduce admin toil, minimize downtime, and bolster resilience in large-scale deployments.
3 Commits • 3 Features
Mar 1, 2025Month: 2025-03 — Delivered three high-impact enhancements to the DAOS control plane, improving multi-rank management, safety, and recovery capabilities. The changes reduce admin toil, minimize downtime, and bolster resilience in large-scale deployments.
March 2025
January 2025
4 Commits • 2 Features
Jan 1, 2025January 2025 — daos-stack/daos: Delivered two high-impact features for cluster management and storage visibility, plus two critical stability fixes focused on multi-NUMA deployment and provisioning workflows. Implemented a system-wide reintegration capability across all pools with test coverage and protobuf/test updates, and added an explicit MD-on-SSD mode flag to standardize mode handling across DAOS layers. These changes enhance operational reliability, diagnostics, and cross-pool management while keeping the codebase aligned with deployment realities.
January 2025
4 Commits • 2 Features
Jan 1, 2025January 2025 — daos-stack/daos: Delivered two high-impact features for cluster management and storage visibility, plus two critical stability fixes focused on multi-NUMA deployment and provisioning workflows. Implemented a system-wide reintegration capability across all pools with test coverage and protobuf/test updates, and added an explicit MD-on-SSD mode flag to standardize mode handling across DAOS layers. These changes enhance operational reliability, diagnostics, and cross-pool management while keeping the codebase aligned with deployment realities.
December 2024
2 Commits • 1 Features
Dec 1, 2024December 2024 – daos-stack/daos: Focused on maintenance automation, reliability, and test fidelity. Key deliveries include a new DMG System Drain command that can drain specified storage nodes or ranks across all pools with host-set or rank-set options, plus expanded unit tests for related control, dmg, and server functions. Also fixed a regression in emulated NVMe storage queries by refactoring getMetaClusterCount, updating adjustNvmeSize to use the refactored function, and correcting getEffCtrlrCount to assign mock PCI addresses when real ones are unavailable. These changes improve operational safety, reduce maintenance risk, and enhance storage visibility in test/dev, demonstrating strong capabilities in tooling, testing, and refactoring across the DAOS control plane.
2 Commits • 1 Features
Dec 1, 2024December 2024 – daos-stack/daos: Focused on maintenance automation, reliability, and test fidelity. Key deliveries include a new DMG System Drain command that can drain specified storage nodes or ranks across all pools with host-set or rank-set options, plus expanded unit tests for related control, dmg, and server functions. Also fixed a regression in emulated NVMe storage queries by refactoring getMetaClusterCount, updating adjustNvmeSize to use the refactored function, and correcting getEffCtrlrCount to assign mock PCI addresses when real ones are unavailable. These changes improve operational safety, reduce maintenance risk, and enhance storage visibility in test/dev, demonstrating strong capabilities in tooling, testing, and refactoring across the DAOS control plane.
December 2024
November 2024
3 Commits • 1 Features
Nov 1, 2024November 2024 monthly summary for daos-stack/daos: Focused on MD-on-SSD pool management and memory ratio enhancements, with user-facing improvements to configuration and visibility. Key accomplishments include mem_ratio support added to pool extend and reintegrate APIs, updates to docs and CLI for MD-on-SSD configurations, and enhanced pool listing output to reflect META/DATA tiers and MD-on-SSD data capacities. Storage query improvements for MD-on-SSD and ensuring meta_sz is passed to pool extend/reintegrate API improved reliability and consistency. This work reduces operational risk and improves capacity planning, monitoring, and performance tuning for MD-on-SSD deployments.
November 2024
3 Commits • 1 Features
Nov 1, 2024November 2024 monthly summary for daos-stack/daos: Focused on MD-on-SSD pool management and memory ratio enhancements, with user-facing improvements to configuration and visibility. Key accomplishments include mem_ratio support added to pool extend and reintegrate APIs, updates to docs and CLI for MD-on-SSD configurations, and enhanced pool listing output to reflect META/DATA tiers and MD-on-SSD data capacities. Storage query improvements for MD-on-SSD and ensuring meta_sz is passed to pool extend/reintegrate API improved reliability and consistency. This work reduces operational risk and improves capacity planning, monitoring, and performance tuning for MD-on-SSD deployments.
Activity
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Quality Metrics
Correctness92.2%
Maintainability85.8%
Architecture87.6%
Performance81.2%
AI Usage22.6%
Skills & Technologies
Programming Languages
BashCC++GoMakefileMarkdownProtocol BuffersPythonShellYAML
Technical Skills
API DesignAPI designAPI securityBackend DevelopmentBug FixingC DevelopmentC ProgrammingC programmingCLI DevelopmentCLI developmentCode ClarityCode FormattingCommand-line Interface (CLI)Command-line Interface DevelopmentConfiguration Management
Repositories Contributed To
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