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OSD developer documentation

Contents

• Asynchronous Recovery
• Backfill Reservation
• Erasure Coded Placement Groups
  • Glossary
  • Table of contents
    • Developer notes
      • Introduction
      • Reading and writing encoded chunks from and to OSDs
      • Erasure code library
      • Notes
    • Jerasure plugin
      • Introduction
    • ECBackend Implementation Strategy
      • Miscellaneous initial design notes
        • PGTemp and Crush
        • Distinguished acting set positions
        • Object Classes
        • Scrub
        • Crush
    • ECBackend
      • MAIN OPERATION OVERVIEW
        • WHOLE STRIPE WRITE
        • READ-MODIFY-WRITE
        • OSD Object Write and Consistency
        • ExtentCache
        • Pipeline
• last_epoch_started
• Log Based PG
  • Background
    • Why PrimaryLogPG?
    • Primary log-based replication
  • ReplicatedBackend/ECBackend unification strategy
    • PGBackend
  • PGBackend Interface Explanation
    • Readable vs Degraded
    • Client Reads
    • Scrubs
    • Recovery
• Manifest
  • Introduction
  • Intended Usage Model
    • RBD
    • RadosGW
  • Status and Future Work
    • Cleanups
    • Testing
    • Snapshots
    • Cache/Tiering
  • Data Structures
  • Request Handling
  • RADOS Interface
  • ceph-dedup-tool
• Map and PG Message handling
  • Overview
  • MOSDMap
  • MOSDPGOp/MOSDPGSubOp
  • CEPH_MSG_OSD_OP processing
  • Peering Messages
• QoS Study with mClock and WPQ Schedulers
  • Introduction
  • Overview
  • Test Environment
  • Test Methodology
  • Establish Baseline Client Throughput (IOPS)
  • MClock Profile Allocations
    • high_client_ops(default)
    • balanced
    • high_recovery_ops
    • custom
  • Recovery Test Steps
    • Test Steps(Using cbt)
    • Non-Default Ceph Recovery Options
  • Test Results
    • Test Results With NVMe SSDs
      • Client Throughput Comparison
      • Client Latency Comparison
      • Recovery Statistics Comparison
    • Test Results With HDDs (WAL and dB configured)
      • Client Throughput & latency Comparison
      • Recovery Statistics Comparison
    • Test Results With HDDs (No WAL and dB configured)
      • Client Throughput & latency Comparison
      • Recovery Statistics Comparison
  • Key Takeaways and Conclusion
• OSD
  • Concepts
  • Overview
• OSD Throttles
  • WBThrottle
  • op_queue_throttle
  • journal usage throttle
• Partial Object Recovery
  • Procedures for Partial Object Recovery
• PastIntervals
  • Purpose
  • Maintenance and Trimming
  • OSDMap Trimming
  • Back to PastIntervals
• PG
  • Concepts
  • Peering Details and Gotchas
• PG Removal
• PGPool
• Recovery Reservation
  • Dump Reservations
  • Things to Note
  • See Also
• Refcount
  • Introduction
  • Class Interface
• Scrub internals and diagnostics
  • Scrubbing Behavior Table
  • State variables
  • Scrub Reservations
• Snaps
  • Overview
  • Ondisk Structures
  • Snap Removal
  • Recovery
  • SnapMapper
  • Split
• Preventing Stale Reads
  • readable_until
  • Prior Intervals
  • PG “laggy” state
  • PG “wait” state
  • Dead OSDs
• Watch Notify
  • Overview
  • Watch Lifecycle
  • Notify Lifecycle
• Writeback Throttle