not sure if this helps but here is more info
# vmkfstools -P /vmfs/devices/disks/
DEVFS-1.00 file system spanning 1 partitions.
File system label (if any): devices
Mode: private
Capacity 364166049280 (711261815 file blocks * 512), 364166049280 (711261815 blocks) avail
UUID: 00000000-00000000-0000-000000000000
Partitions spanned:
devices