1. When the signal has to find itself
Carl Sagan’s Contact returns as the recalled work because its search for extraterrestrial signals is a long exercise in distinguishing meaningful patterns from noise. The desktop’s fault recovery test is similar: it must distinguish a real fault from a sensor glitch, a transient from a failure, and a recoverable error from a catastrophic one.
This entry defines the autonomous fault recovery and service continuity test matrix.
2. Test setup
The test uses a flight-representative rack with multiple cells running operational software. Faults are injected either physically or through simulation. The platform is expected to detect, diagnose, and recover without ground intervention during the outage window. Power, thermal, compute, storage, network, and service state are recorded continuously.
3. The test matrix
| Case | Scenario | Conditions | Expected outcome |
|---|---|---|---|
| 1 | Single cell reboot | One compute cell resets during nominal load | Workload migrates; service continues; cell rejoins cleanly. |
| 2 | Power bus transient | Brief undervoltage on one distribution branch | Loads shed briefly; voltage recovers; no data loss. |
| 3 | Network partition | One segment loses network contact with the federation | Segment operates autonomously; reconciles after partition heals. |
| 4 | Storage error | A storage cell reports corruption or unavailability | Healing or replica promotion occurs; critical data remains available. |
| 5 | Thermal emergency | A cell approaches its thermal limit | Workload migrates; heaters or coolers adjust; service continues. |
| 6 | Ground-link loss during fault | All the above during an extended communication outage | Platform recovers autonomously; ground is informed when contact returns. |
| 7 | Cascading fault | A recovery action triggers a secondary fault | Platform detects cascade and escalates to a safe, stable mode. |
| 8 | Combined stress | Several faults plus peak load | Critical services survive; non-critical services are shed predictably. |
4. What is measured
For each case the test records:
- Fault detection time and classification accuracy.
- Service availability and latency during and after the fault.
- Power, thermal, and compute metrics on all cells.
- Network partition and federation reconfiguration events.
- Data integrity and consistency checks.
- Whether recovery required human intervention.
- Whether the platform returned to a stable, known state.
5. What this changes
- The autonomous fault recovery and service continuity test has a concrete matrix.
- The matrix links back to the compute migration, storage healing, network reconfiguration, thermal management, and segment split arcs.
- The next entry will define pass and fail criteria.