How do I know when to add capacity to my virtual infrastructure?

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Virtual infrastructure
Virtual Machine Performance Management
Virtual Machines
What tools and methods do you use to predict when you'll need to expand capacity in your virtual infrastructure? How do you add VMs effectively to the system and still make sure you're allocating resources well? Any tips would be appreciated.

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One good metric to use is in you loose one host, can you other hosts handle the memory and CPU load that will be shifted onto them?

In other words if you have two VM hosts (doesn’t matter the platform) with 64 Gigs of RAM, and each one has 12 Ghz of CPU power.

If each machine runs with 20 Gigs of RAM in use and 5 Ghz of CPU power used, then you are fine. However if both machines use over 32 Gigs of RAM or over 6 Ghz of CPU power then you need to either upgrade the hosts, or add another host.

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