Tag: SystemMonitoring

Predictive Count/Resolve Time for .

Posted on by lechuck park

the “Predictive Count/Resolve Time” Diagram

This diagram illustrates the workflow of IT Operations or System Maintenance, specifically comparing Predictive Maintenance (Proactive) versus Recovery/Reactive (Reactive) processes.

It is divided into two main flows: the Preventive Flow (Left) and the Reactive Flow (Right).

1. Left Flow: Predictive Maintenance

This represents the ideal process where anomalies are detected and addressed before a full system failure occurs.

  • Process:
    • Work Changes / Monitoring: Routine operations and continuous system monitoring.
    • Anomaly: The system exhibits abnormal patterns, but it hasn’t failed yet.
    • Detection (Awareness): Monitoring tools or operators detect this anomaly.
    • Predictive Maintenance: Maintenance is performed proactively to prevent the fault.
  • Key Performance Indicators (KPIs):
    • Count: The number of times predictive maintenance was performed.
    • PTM Success Rate: A metric to measure success (e.g., considered successful if no disability/failure occurs within 14 days after the predictive maintenance).

2. Right Flow: Reactive Recovery

This is the response process when an anomaly is missed, leading to an actual system failure.

  • Process:
    • Abnormal → Alert: The condition worsens, triggering an alert. The time taken to reach this point is MTTD (Mean Time To Detect).
    • Fault Down: The system actually fails or goes down.
    • Propagation Time (to Experts): The time it takes to escalate the issue to the right experts. This relates to MTTE (Mean Time To Engage Expert).
    • Recovery Time: The time taken by experts to fix the issue.
  • Key Performance Indicators (KPIs):
    • MTTR (Mean Time To Resolve/Repair): The total time from the failure (Fault Down) until the system is fully recovered. Reducing this time is a critical operational goal.

3. Summary & Key Takeaway

The diagram visually emphasizes the importance of “preventing issues before they happen (Left)” rather than “fixing them after they break (Right).”

  • Flow Logic: If an ‘Anomaly’ is successfully ‘Detected’, it leads to ‘Predictive Maintenance’. If missed, it escalates to ‘Abnormal’ and results in a ‘Fault Down’.
  • Goal: The objective is to minimize MTTR (downtime) on the right side and increase the PTM Count (proactive prevention) on the left side to ensure high system availability.

#DevOps #SRE #PredictiveMaintenance #MTTR #IncidentManagement #ITOperations #SystemMonitoring #DisasterRecovery #MTTD #TechMaintenance

With Gemini

Time Constant(Delay of the sensor)

Posted on by lechuck park

Image Interpretation: System Problems Due to Sensor Delay

This diagram explains system performance issues caused by the Time Constant (delay) of temperature sensors.

Top Section: Two Workload Scenarios

LLM Workload (AI Tasks)

  • Runs at 100% workload
  • Almost no delay (No Delay almost)
  • Result: Performance Down and Workload Cost waste

GPU Workload

  • Operating at 80°C
  • Thermal Throttling occurs
  • Transport Delay exists
  • Performance degradation starts at 60°C → Step down

Bottom Section: Core of the Sensor Delay Problem

Timeline:

  1. Sensor UP start (Temperature Sensor activation)
    • Big Delay due to Time Constant
  2. TC63 (After 10-20 seconds)
    • Sensor detects 63% temperature rise
    • Actual temperature is already higher
  3. After 30-40 seconds
    • Sensor detects 86% rise
    • Temperature Divergence, Late Cooling problem occurs

Key Issues

Due to the sensor’s Time Constant delay:

  • Takes too long to detect actual temperature rise
  • Cooling system activates too late
  • GPU already overheated, causing thermal throttling
  • Results in workload cost waste and performance degradation

Summary

Sensor delays create a critical gap between actual temperature and detected temperature, causing cooling systems to react too late. This results in GPU thermal throttling, performance degradation, and wasted computational resources. Real-time monitoring with fast-response sensors is essential for optimal system performance.

#ThermalManagement #SensorDelay #TimeConstant #GPUThrottling #DataCenter #PerformanceOptimization #CoolingSystem #AIWorkload #SystemMonitoring #HardwareEngineering #ThermalThrottling #LatencyChallenges #ComputeEfficiency #ITInfrastructure #TemperatureSensing

With Claude