{
  "slug": "iscsi-cmdsn",
  "term": "iSCSI Command Sequence Number",
  "aliases": [
    "CmdSN"
  ],
  "definition": "An iSCSI Command Sequence Number (CmdSN) identifies a command's position in the session-wide delivery sequence.",
  "note": "It is a 32-bit serial number; immediate commands carry the current value without advancing it. ExpCmdSN and MaxCmdSN delimit the command window. Delivery ordering is not a durability guarantee. [rfc]\n\nThe paired analysis includes an illustrative cross-connection trace, not measured traffic. [analysis]",
  "status": "shipping",
  "advantages": [],
  "limitations": [],
  "related": [
    "iscsi",
    "iscsi-session",
    "iscsi-statsn"
  ],
  "supersedes": [],
  "supersededBy": [],
  "firstSeen": null,
  "lastSeen": null,
  "citations": [
    {
      "id": "rfc",
      "title": "RFC 7143: iSCSI numbering, section 4.2.2.1",
      "url": "https://www.rfc-editor.org/rfc/rfc7143.html#section-4.2.2.1",
      "accessed": "2026-10-17"
    },
    {
      "id": "analysis",
      "title": "Hesela: iSCSI identity, sessions and recovery",
      "url": "https://hesela.com/analyses/iscsi-identity-sessions-recovery/",
      "accessed": "2026-10-17"
    }
  ],
  "updated": "2026-10-17"
}