{
  "slug": "active-zone-limit",
  "term": "Active-zone limit",
  "aliases": [
    "maximum active zones"
  ],
  "definition": "An active-zone limit caps the zones simultaneously in implicitly open, explicitly open or closed states in a zoned namespace.",
  "note": "A closed, partially written zone still counts, even when no thread writes to it. Budget reclamation and metadata activity as well as foreground streams; the limit is not a free-byte counter.",
  "status": "shipping",
  "advantages": [],
  "limitations": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-11",
  "related": [
    "zns",
    "open-zone-limit",
    "zone-capacity"
  ],
  "citations": [
    {
      "id": "zonefs",
      "title": "Linux kernel documentation, zonefs: sequential files, explicit-open and runtime sysfs attributes.",
      "url": "https://docs.kernel.org/filesystems/zonefs.html",
      "accessed": "2026-10-11"
    },
    {
      "id": "bjorling",
      "title": "Bjorling, Aghayev, Holmberg, Ramesh, Le Moal, Ganger and Amvrosiadis. ZNS: Avoiding the Block Interface Tax for Flash-based SSDs. USENIX ATC 2021, pp. 689-703, sections 3-5 and Table 3.",
      "url": "https://www.usenix.org/system/files/atc21-bjorling.pdf",
      "accessed": "2026-10-11"
    },
    {
      "id": "hesela-zns",
      "title": "Hesela: ZNS resource limits and worked examples",
      "url": "https://hesela.com/analyses/zns-open-active-zone-limits/",
      "accessed": "2026-10-11"
    }
  ]
}