Mount Datastore option grayed out

In vCenter 6.5 I have a datastore which I unmount but need to mount again. The problem is the option to mount the datastore is grayed out???
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
tried esxcli ?
compdigit44Author Commented:
No, the strange part is that under the host tab is not showing any host and I do know it is present from our san
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
does the LUN appears in storage devices, just needs console to mount it...

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Murali SripadaCommented:
You can try rescan on esxi host assuming everything presented properly to esxi host... Second is check vmkernel log under var/log which can shed some light
compdigit44Author Commented:
Well we found the issue. Our SAN Admin was work on a Lun and removed the wrong Lun from the SAN. Was he present it again, we were good to go.
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