Can you figure out why the following statements are wrong? They are all well-meaning pieces of advice on the topic of capacity management. I'm sure you have heard them, or even given them.
Regarding cluster RAM:
We recommend a 1:2 overcommit ratio between physical RAM and virtual RAM. Going above this is risky.
Memory usage on most of your clusters is high, around 90 percent. You should aim for 60 percent as you need to consider HA.
Active memory should not exceed 50-60 percent. You need a buffer between active memory and consumed memory.
Memory should be running at a high state on each host.
Regarding cluster CPU:
The CPU ratio in cluster X is high at 1:5, because it is an important cluster.
The rest of your clusters' overcommit ratios look good as they are around 1:3. This gives your some buffer for spike and HA.
Keep the overcommitment ratio at 1:4 for tier 3 workload.
CPU usage is around 70 percent on cluster Y. Since they are User Acceptance Testing (UAT...