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Please help !
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If you would like to have one core dedicated to each VM you're right.
But usually you could assign far more ressources as the one available to your VMs - it's called "overprovisioning".
How i can create more ??
How to use it sir ?
what virt are you using?? you've not explained much here
If it's OpenVZ you just keep creating - it won't stop you.
As it seems you are right at the beginning of the whole server and administration thing, I will keep it short and simple:
Just assign the amount of ressources you want to each VM and your virtualization platform will do the rest for you. But abviously you then can't max out every single VM at the same time...
Usually you can allocate reasonably more virtual resources than the real resource you have, in terms of CPU cores, RAM and disk space. It's very unlikely a virtual machine would use out all resources all the time. So let's say on average, the vm's are using 20% of CPU, 50% of RAM, and 30% disk storage. Then you probably can allocate 5x CPUs, 2x RAM and maybe 3x RAM. But you have to monitor the resource usage, because sometimes some vm might be really busy.
Its the hard disks you need to worry about really.
So can i use ESXi to create more VM although limit cores ??
A balance between hardware resources and node/vm stability should be what you go for, volume to be provisioned vary depending on hardware
if this confuses you, I am too! :P