{
  "title": "Fault Tree Analysis for Render Farm Cluster Failure",
  "slug": "fault-tree-analysis",
  "wikidata_entities": {
    "fault_tree_analysis": "Q428453",
    "render_farm": "Q382597"
  },
  "top_event": {
    "id": "CLUSTER_FAILURE",
    "condition": "≥50% of render nodes offline simultaneously",
    "gate_type": "OR"
  },
  "gates": [
    {
      "id": "POWER_FAILURE",
      "gate_type": "AND",
      "children": ["PSU_A_FAIL", "PSU_B_FAIL"]
    },
    {
      "id": "COOLING_FAILURE",
      "gate_type": "OR",
      "children": ["CRAC_UNIT_DOWN", "HOTSPOT_TEMP_EXCEEDED"]
    },
    {
      "id": "NETWORK_PARTITION",
      "gate_type": "AND",
      "children": ["SWITCH_A_DOWN", "SWITCH_B_DOWN"]
    },
    {
      "id": "SOFTWARE_CASCADE",
      "gate_type": "OR",
      "children": ["DRIVER_CRASH", "QUEUE_MANAGER_HANG"]
    }
  ],
  "basic_events": [
    {"id": "PSU_A_FAIL", "probability": 0.001, "mitigation": "hot-swap PSU"},
    {"id": "PSU_B_FAIL", "probability": 0.001, "mitigation": "hot-swap PSU"},
    {"id": "CRAC_UNIT_DOWN", "probability": 0.002, "mitigation": "redundant CRAC"},
    {"id": "HOTSPOT_TEMP_EXCEEDED", "probability": 0.01, "threshold": "85°C", "mitigation": "active airflow redistribution"},
    {"id": "SWITCH_A_DOWN", "probability": 0.0005, "mitigation": "stackwise redundancy"},
    {"id": "SWITCH_B_DOWN", "probability": 0.0005, "mitigation": "stackwise redundancy"},
    {"id": "DRIVER_CRASH", "probability": 0.05, "mitigation": "driver pinning + rollback"},
    {"id": "QUEUE_MANAGER_HANG", "probability": 0.03, "mitigation": "watchdog timer + auto-reset"}
  ],
  "minimal_cut_sets": [
    ["PSU_A_FAIL", "PSU_B_FAIL"],
    ["CRAC_UNIT_DOWN"],
    ["HOTSPOT_TEMP_EXCEEDED"],
    ["SWITCH_A_DOWN", "SWITCH_B_DOWN"],
    ["DRIVER_CRASH"],
    ["QUEUE_MANAGER_HANG"]
  ],
  "probability_formula": {
    "OR_gate": "P(TOP) = 1 − ∏(1−P_i)",
    "AND_gate": "P(TOP) = ∏P_i"
  },
  "version": "1.0",
  "published": "2026-07-18T16:32Z",
  "author": "stream.4ort.net"
}