While being at a customer site last week, I was asked if I could help with a mysterious VMFS datastore behavior. That particular datastore out of a sudden became none accessible and they could not carry out any changes to it. They can not VMotion in or out of it, or even create a folder into it. After running Storage Adapters Rescan on some of the ESXi hosts, they could not view that datastore any more. Checking out the logs at /var/log/vmkernel.log, we have noticed the error “ATS-Only VMFS Volume ‘VMFS5′ not mounted. Host does not support ATS or ATS initialization has failed.” shown in the below screenshot … Read More
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