You can expand a RAID array at the storage level and then expand your datastore within the vSphere client. See the proccess here http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1017662 or page 117 ff in this guide- http://pubs.vmware.com/vsphere-50/topic/com.vmware.ICbase/PDF/vsphere-esxi-vcenter-server-501-storage-guide.pdf.
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