v1.6

Version 1.6 (2026-11) of the Persian and English editions: PDF, EPUB, DOCX and single-file HTML.
Read online at https://book.ceph-s3.ir/ · License CC BY-NC-SA 4.0.

Added

• Part IV, "Specialist Part" (chapters 34–42), on RADOS, RBD and RGW, checked against the
  Ceph main branch (November 2026): RADOS object model and op path; pg log, past intervals
  and recovery; snapshots, watch/notify and cls; RBD image layout, striping and object map;
  the librbd I/O path, exclusive lock and caches; rbd-mirror internals; the RGW data model
  (bucket index, OLH versioning, manifest, multipart); the RGW request path (SigV4, quota,
  rate limit, gc, lifecycle); and multisite internals (period commit, log records, sync
  status objects, bilog generations, conflict resolution). 45 new algorithm boxes and 25
  new figures, with answers for every review question.
• English placeholder pages for chapters 34–42, so numbering matches the Persian edition.
• Glossary: 20 new terms (OLH, bilog, mdlog, period, error repo, bilog generation, SigV4,
  placement target, delete marker, multipart upload, RGW gc, RGW rate limit, SnapSet,
  SnapMapper, PastIntervals, divergent entry, watch/notify, hobject_t, PWL, mirror snapshot).
• Bibliography: Ceph developer docs for the bucket index, RGW placement and multisite.

Changed

• Version 1.6 in metadata, covers (back text lists the specialist part), preface and README.