Extending an EagerZeroedThick Disk

http://blogs.vmware.com/vsphere/2012/06/extending-an-eagerzeroedthick-disk.html

~ # vmkfstools -X 6G -d eagerzeroedthick  /vmfs/volumes/cs-ee-symmlun-001A/cormac.vmdk                                              
Grow: 100% done. All data on '/vmfs/volumes/cs-ee-symmlun-001A/cormac.vmdk' will be overwritten with zeros from sector <8388608> onwards.
Zeroing: 100% done.