VCE just released a new KB vce2563 to description the issue.
If your ESXi 5.x hosts is connected on VMAX running Enginuity 5876.159.102 and later, you may see this particular issue after reboot ESXi host or attach storage if you enabled block delete feature of VAAI.
To check the option status you can run following command on PowerCLI:
Get-VMHost -Location cluster name | Get-VMHostAdvancedConfiguration -Name VMFS3.EnableBlockDelete
