{
  "status": "shipping",
  "advantages": [],
  "limitations": [],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "updated": "2026-10-23",
  "slug": "storage-bus-cache",
  "term": "Storage Bus Cache",
  "aliases": [
    "Standalone Storage Bus Cache"
  ],
  "definition": "Storage Bus Cache is a Windows Server feature that binds faster drives to HDD capacity on a standalone Storage Spaces server.",
  "note": "The documented Server 2022 setup needs the Failover Clustering feature installed but excludes cluster membership and all-flash systems. [spaces-standalone]\n\nFor resilient mirror-accelerated-parity volumes, this cache handles reads; the ReFS mirror tier separately absorbs writes in Shared mode. Simple spaces allow read/write caching without drive-failure tolerance. Shared mode reserves part of the faster media for cache rather than dedicating every fast drive. [spaces-standalone]",
  "related": [
    "storage-spaces",
    "storage-spaces-direct",
    "mirror-accelerated-parity",
    "refs"
  ],
  "citations": [
    {
      "id": "spaces-standalone",
      "title": "Microsoft Learn: Standalone Storage Bus Cache prerequisites and resiliency-dependent caching",
      "url": "https://learn.microsoft.com/en-us/windows-server/storage/storage-spaces/storage-spaces-storage-bus-cache",
      "accessed": "2026-10-23"
    }
  ],
  "provenance": [
    "Documentation review, not a Windows experiment. Scope follows the tutorial's explicit prerequisites, not its broader applicability banner. No measured performance or failure-rate claim."
  ]
}