Virtual machines lost from Inventory

I shutdown ESXi server and when I restarted, all virtual machines were gone from inventory.  Under localhost there are no entries.
Datastore is there and the space occupied by the virtual machines is allocated.
Is there a way to rebuild the inventory or re-activate the virtual machines already on datastore?
This is a production server, so any ideas are welcome.
choracyAsked:
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sk_raja_rajaConnect With a Mentor Commented:
Browse the datastore for that VMs vmx file and select it.  Complete the resulting wizard to add the VM back to inventory.   I Did you create any new LUN's on the SAN ?
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sk_raja_rajaCommented:
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.
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choracyAuthor Commented:
I had no idea that I could browse the datastore. Your hint made me discover this capability. Then adding the machines to the inventory was a click away. You've been a great help, thank you.
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