I had a query on VMWare ESX 3.5 I was hoping someone could help me with. The questions surrounds memory usage.
Let's say the ESX host has 16GB RAM.
I have four guests running on it, each with 4GB RAM assigned. Technically, this should be fine I understand, because the servers won't always be using 4GB RAM, and even if they did, then we are covered.
Now, let's say I added another guest with 4GB RAM. Even if we don't expect the all servers to use their full memory allocation at the same time, can this still cause performance degradation to the host (and therefore other guests)?
In general, what are people's recommendations in terms of allocated RAM v physical RAM?
The only time I run into even a little problem is during backups. I do host based backup, and depeding on the timing, it does get a little close to the limit of 32GB, BUT that is a night and no one is working anyway. :o)