You can mount original, snapshot, or replica VMFS volumes on the same ESX Server
host.
To mount original, snapshot, or replica VMFS volumes
1 Perform the required storage tasks:
a Make the array snapshot or replica.
b Mask or zone the snapshot or replica to the ESX Server.
2 In the VI Client, select the host in the inventory panel.
3 Click the Configuration tab and click Advanced Settings.
4 Select LVM in the left panel, then set the LVM.EnableResignature option to 1.
5 Rescan for any new LUNs or VMFS volumes. Volumes that are detected to be
snapshots or replicas are resignatured.
After rescan, the copied VMFS volume appears as
/vmfs/volumes/snap-<DIGIT>-<old-label>.
If the .vmx file for any of the virtual machines or the .vmsd file for virtual machine
snapshots contains /vmfs/volumes/<label or UUID>/ paths, you must change
these items to reflect the resignatured volume path.
6 Set the LVM.EnableResignature option to 0 after resignaturing is complete.
Taken from
http://www.vmware.com/pdf/vi3_35/esx_3/r35u2/vi3_35_25_u2_san_cfg.pdf
