Andy's VMware vSphere tip#17: Datastore storage: Leave at least 20-30% FREE!

If you create many VMs per datastore, and try to use all the storage space, this is a bad idea, you ideally need to reserve at least 20-30% per datastore based on total storage, to allow for Memory SWAP files - When a VM is powered on, it creates a swap file on the datatore (where the vmx configuration file is stored by default), which is equal to the memory assigned to the VM.

Also snapshots need additional storage space.

You can set alarms to warn you of storage (datastore) space issues.

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