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Article ID: 309797
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Updated On:
Environment
VMware vCenter Server 5.1.x
VMware vCenter Server 6.x
VMware vCenter Server 7.0.x
VMware vCenter Server 6.0.x
Cause
This issue occurs because the RDM LUN is not visible on the target host.
If the RDM LUN is visible, but it does not always present to the target host, you may see the error:
Virtual Disk 'X' is a mapped direct access LUN that is not accessible