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Recommended Free Space on VMware Datastore

Posted on 2010-11-24
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Last Modified: 2012-06-27
Hello all,

I've got a quick question.  I've not been able to find any information that deals directly with this topic.

How much space is recommended on a datastore for things such as snapshots, swap file, etc?

We have a 1024GB total capacity.  831GB is provisioned, and 193GB is free.  We are at the warning threshold on free space and I wondered what is really needed to be kept free.

Obviously snapshots are variable, but we don't create them and leave them for extended periods of time, so that growth shouldn't get out of control.

Thanks in advance for any input!
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Question by:Jaguar5150
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bgoering earned 125 total points
ID: 34205511
Space is needed for vm swap file (unless you have redirected that elsewhere) equal to allocated RAM for all the vms on the datastore. VMware creates that file when the vm is powered on. As you noted snapshots can take a LOT of space if they are mismanaged (or forgotten). Another thing to consider is if you use thin provisioning - in that case the base vmdk file will also grow over time.

My rule of thumb is 15% free space.

Hope this helps
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by:Jaguar5150
ID: 34205873
Thanks for the quick reply.  It has helped enough for me  :)
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