You seem to have a VMware question. Therefore answers and guidelines can be found in VMware articles, blogs and forums. E.g.
https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1025279
http://www.lucd.info/2010/03/23/yadr-a-vdisk-reporter/
Google finds many more....