Hi,
So I am trying to understand how memory is used on ESX / vm's. I am also having trouble getting clients to go lower on memory requirements (our standard 1CPU/1GB memory); usually trying to tone down a 2-4 GB requests. My question is: What is the effect of a VM taking up too much memory that it doesn't use?
Simple example: (hopefully)
Client requests a 1GB -> 3GB memory increase for some testing; VC performance charts show VM is using ~12% usage over period of "normal" server load. I simply say that its not recommended, but they want it because their app is poorly designed (not performing up to their standards); so they wanna just test giving it 3GB. We upgrade the VM. Testing completes and I never hear back from the client; even after my emails requesting the downgrade. Now the server is 6% usage on memory.
Cluster:
8 ESX hosts; CPU ~25% ; Memory ~50% across all hosts; 142 GB physical memory
67 VM's;assigned 92 GB vMemory
So, if this server doesn't use the extra 2 GB, it still remains in the free pool to use? Any downside to not removing this additional memory? What will happen when this cluster gets more VM's; more load.
HO HO HOpefully someone can answer my questions.
