Snapshot Sizing in ESX

10 pts.
Tags:
ESX
ESX 3.5
VM snapshots
VMware ESX 3.5
VMware snapshots
Does anyone know how much space is needed when trying to recommit snapshots back?  Do you need on your disk the size of the *.vmdk file plus the snapshot file as well?  Or, is there a formula that is used to determine this.  We are trying to figure out if we can recommit some snapshots back when our free space is less than the size of the *.vmdk and the snapshot.  Thank you. 

Software/Hardware used:
ESX 3.5i

Answer Wiki

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check the following VMware KB Articles to get a better understanding about VMware Snapshots:

http://kb.vmware.com/kb/1025279

http://kb.vmware.com/kb/1015180

http://kb.vmware.com/kb/1009402

How much space you need to successfully commit depends on the actual size of your delta file ….delta.vmdk.
If you can try to commit the snapshot when the virtual machine is off. With this you avoid the need to create another helper snapshot for the VM to wite to when merging the delta disk with the base disk.

Also the space requirements needed to commit a snapshot have changed in the last 3 versions of ESX Server, so it also depends what version of ESX Server you are running.

This Article disribes this:

http://kb.vmware.com/kb/1003302

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