I have all those errors. But...

These are my volumes:

471f52da-d332b8d5-75f4-00132107ee09 storage1 (3)
472103b3-190ce1f5-33f9-00132107ee09 xpst_rdcro01app101_ro_01
472103b3-25629fff-5343-00132107ee09 xpst_rdcro01app101_ro_02

This is what I have in disks:

root@rdcro01wmx114 volumes# cd /vmfs/devices/disks
root@rdcro01wmx114 disks# ls
vmhba0:0:0:0 vml.020000000060060e80042aa40000002aa40000041d4f50454e2d56
vmhba1:0:0:0 vml.020001000060060e80042aa40000002aa4000006224f50454e2d56
vmhba1:0:1:0 vml.020002000060060e80042aa40000002aa400000caa4f50454e2d56
vmhba1:0:2:0 vml.020003000060060e80042aa40000002aa400000cab4f50454e2d56
vmhba1:0:3:0

This is the command:

root@rdcro01wmx114 volumes# vmkfstools -L lunreset /vmfs/devices/disks/vmhba1:0:2:0 ; vmkfstools -z /vmfs/devices/disks/vmhba1:0:2:0 /vmfs/volumes/test2.vmdk
GetFreeSpace: ioctl on /vmfs/volumes/test2.vmdk failed with 38 -1
Failed to create virtual disk: Function not implemented 2490377

I'm not even sure what that means or if I understood corectly that article. The thing is I don't understand what's with that .vmdk file, I need a raw device, accessed directly by the virtual machine, not as storage to ESX host.