ESXi 5.0 and 5.1 hosts fail to mount newly created VMFS-5 Datastores

Have you deployed VAAI in your vSphere 5.x environment using newly created VMFS-5 datastores?

An issue has been discovered with the Atomic Test & Set (ATS) VAAI primitive (which is enabled by default) on ESXi 5.0 and ESXi 5.1 hosts using datastores which were created with VMFS-5

VMware has released the following KB article which clarifies the issue and recommends disabling ATS  with VAAI enabled storage arrays:

  • ESXi 5.0 hosts fail to mount VMFS5 volumes that are formatted with ATS-only capabilities

Please note that according to the KB article:

“This issue is seen to occur in, but is not restricted to, EMC arrays Clariion CX4, NS, and VNX arrays”. 

By Rotem Agmon Posted in Info

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