After unplanned PDL, Datastore is gone from vSphere. Storage team confirmed that they have presented the LUN to the hosts & clusters. However, the datastore is not detected as existing datastore and also not detected as new LUN. Feb 03, 2016 Feb 2, 2016 at 17:28 UTC. The major reason for a datastore to become inaccessible is a loss in connectivity. This is not uncommon with network attached storage and even SAN, and is why multipathing is so important.
After you create a virtual datastore, it remains inaccessible.
The vSphere Web Client shows the datastore as inaccessible. You cannot use the datastore for virtual machine provisioning.
Cause
This problem might occur when you fail to configure protocol endpoints for the SCSI-based storage container that is mapped to the virtual datastore. Like traditional LUNs, SCSI protocol endpoints need to be configured so that an ESXi host can detect them.
Before creating virtual datastores for SCSI-based containers, make sure to configure protocol endpoints on the storage side.