Monica Rathbun had a major performance problem; this is how she solved it:
Symptoms:
- Very High Disk Latency as high as 300,000 milliseconds (ms) is not unusual
- Average: 900 – 15,000ms
- Memory Pressure
- Slow User Experience
Problem:
- Bad hardware
- Over-provisioned VM Hosts (what happens on one VM effects the other)
- Old NetApp SAN
- No infrastructure budget for new hardware
Challenge: Make the system viable with no hardware changes or tweaks
Those disk latencies are scary. I like the systematic approach Monica takes, and the end result was very positive.