{
  "slug": "copy-on-abundant-write",
  "term": "Copy-on-abundant-write",
  "aliases": [],
  "definition": "Copy-on-abundant-write is a research cloning policy that buffers changes to postpone unsharing until enough work accumulates to justify copying.",
  "note": "BetrFS 0.5 implements this policy; structural maintenance can also require unsharing. It is not a generic Linux reflink option. [fast2020]",
  "status": "research",
  "advantages": [],
  "limitations": [],
  "related": [
    "copy-on-write",
    "reflink"
  ],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "citations": [
    {
      "id": "fast2020",
      "title": "Zhan et al., How to Copy Files, FAST 2020, sections 1-4",
      "url": "https://www.usenix.org/system/files/fast20-zhan.pdf",
      "accessed": "2026-10-15"
    },
    {
      "id": "hesela-clones",
      "title": "Hesela: Fast file clones and deferred copying costs",
      "url": "https://hesela.com/analyses/file-clones-deferred-copy-cost/",
      "accessed": "2026-10-15"
    }
  ],
  "updated": "2026-10-15"
}