ESXi – No extent device available

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I was trying to add an extent today for a lab I was doing and I couldn’t get the new disk to show up in the ‘increase’ wizard…

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I knew that you had to make sure the new ‘extent’ disk was accessible on every ESXi host that was accessing the existing VMFS datastore.  I check the storage controller and verified that it was.  Turns out that all I had to do was do a ‘rescan’ on each host that had the existing VMFS datastore mapped on it. Once I did that, it showed up in the wizard.  Until you do a rescan, the new disk was getting hidden by the ‘LUNs not exposed to all hosts that share the original VMFS datastore’ filter.

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