VMware Datastore Free Disk Space

What is the minimum of free disk space that I have to leave on each datastore in order for VMs to properly run?
I am using vSphere Client 5.1.0 and VMware vCenter Server 5.1.0.
Recently, I ran out of disk space on one of the datastores and the virtual machine on it turned off.

Thanks.
cP6uHIT ManagerAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We work on 20% of the datastore volume. This allows for snapshots and VSWAP files.

Do you have snapshots on the VMs, this can be the reason for running out of datastore space.

You may want to check for snapshots, please see my EE Article

HOW TO: VMware Snapshots :- Be Patient
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cP6uHIT ManagerAuthor Commented:
You mean you leave 20% of the volume for log files, snapshots, etc. on each datastore?
I have snapshots setup but I don't use them.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Correct.
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