# esxcfg-volume -l
Scanning for VMFS-6 host activity (4096 bytes/HB, 1024 HBs).
VMFS UUID/label: 5c376ada-69ba365e-a230-4c52621182c2/esxi3-1
Can mount: Yes
Can resignature: Yes
Extent name: t10.ATA_____ST1000NM00552D1V410C_________________________________ZBS1ENA8:3 range: 0 - 945663 (MB)
# esxcli storage vmfs snapshot list
5c376ada-69ba365e-a230-4c52621182c2
Volume Name: datastore2
VMFS UUID: 5c376ada-69ba365e-a230-4c52621182c2
Can mount: true
Reason for un-mountability:
Can resignature: true
Reason for non-resignaturability:
Unresolved Extent Count: 1
esxcli storage vmfs snapshot mount -l "datastore2"
Now rescan your datastores and it should be there.
Otherwise check the full VMWAre article:
https://kb.vmware.com/s/article/2014155