{
  "slug": "smore",
  "term": "SMORE",
  "aliases": [
    "SMR Object REpository"
  ],
  "definition": "SMORE is a research object store that stripes objects across SMR zone sets and reconstructs its flash-resident index from on-disk recovery records.",
  "note": "The 2017 extended paper targets large, seldom-changing objects on host-managed or host-aware SMR disks. Zone sets span different drives; segment headers, deletion tombstones and zone-set digests support recovery from index snapshots. [paper]\n\nIts prototype uses 5+1 RAID-4 parity. Figure 6 includes that parity cost, giving a write-amplification floor of 1.2; the abstract's below-2.0 statement excludes parity. These accounting boundaries must not be mixed. [paper]",
  "limitations": [
    {
      "text": "The main tests use every 60th zone of six 10 TB drives, yielding 766 GB of usable test capacity; selected full-capacity checks do not make every recovery extrapolation a measurement.",
      "citationIds": [
        "paper"
      ]
    },
    {
      "text": "Optional NVRAM buffering adds a separate failure boundary: disk parity cannot recover data still confined to failed buffers; the paper discusses peer recovery or flushing before acknowledgement.",
      "citationIds": [
        "paper"
      ]
    }
  ],
  "related": [
    "hm-smr",
    "smrstore"
  ],
  "citations": [
    {
      "id": "paper",
      "title": "Macko et al. SMORE: A Cold Data Object Store for SMR Drives (Extended Version). arXiv:1705.09701v1, 2017; III-G, IV, V-A/E/F.",
      "url": "https://arxiv.org/pdf/1705.09701v1",
      "accessed": "2026-11-14"
    },
    {
      "id": "hesela",
      "title": "Hesela: Host-Managed SMR, interface and object-store designs.",
      "url": "https://hesela.com/tech/hm-smr/",
      "accessed": "2026-11-14"
    }
  ],
  "provenance": [
    "Primary-paper review, not a reproduced benchmark. Performance and recovery results describe the stated historical configuration.",
    "The evaluated drives were HGST Ultrastar Archive Ha10. Full bibliographic details and source locators are recorded in the versioned research review."
  ],
  "status": "research",
  "advantages": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-11-14"
}