Cannot add VMFS datastore to ESXi host

Cannot add VMFS datastore to ESXi host

 Amit Arora ESX5.x

ISSUE

“Keep existing signature” and “Assign a new signature” is grayed  out and only option is “Format the disk” is available while adding a VMFS Datastore to ESXi host in Cluster.

CAUSE

This issue is related to Non-Persistent Mount Volume between hosts in Cluster.

SOLUTION

First find the volume which are Non-Persistent by running below command on ESXi Host.
#esxcfg-volume -l
By running this you can find the volumes and names.
To persistently mount the volume use, “esxcfg-volume -M” followed by either the UUID or the name of the volume
#esxcfg-volume -M TEMPDATASTORE
After running above commands then rescan storage on hosts and you will see the datastore listed.

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