Moving a virtual machine from 1 datastore to another

Hi everyone,

I have vsphere 5 essential plus licence and  a server 2008 which is a db server in an AD environment.

The server is in one of the 3 vSphere HA enabled hosts.

The server's db disk is getting low I need to move the server to a new datastore if possible because I really do not have much space on that store and I can't allocate more space to extend it.

I haven't done this before and don't know how where to begin.

This transition shouldn't effect the AD conf and NTFS permissions.

I need you help and advises on this.

Thanks

Melih