VAAI Integration … File and Block for EMC

Although this isn’t about security, it is about virtualization and it is information that I was looking for… AND I am all about sharing …. I wanted to post this as a “one pager” of the capabilities of EMC arrays and VMware VAAI and where we stand today on March 21, 2012

vSphere 4.1 primitives


  • Full copy
  • Block zero
  • Hardware Assisted Locking


  • None

vSphere 5.0 primitives


  • Full Copy
  • Block Zero
  • Hardware Assisted Locking
  • Thin Provisioning Stun
  • Thin Provisioning Reclaim (ACTUALLY IN 5.0u1)


  • Fast/Full Clone
  • Reserve Space
  • Extended Stats
  • Offload Abort/Status

Note – UNMAP : in vSphere 5.0 when deleting a file, VMware would unmount it. In 5.0 patch 1 VMware disabled this capability entirely for all arrays.
In 5.0u1, VMware reenabled functionality but it a manual process. VNX supports this, VMAX does not support this currently but plans to in 2012

Here is the link to the KB at VMware regarding the UNMAP in 5.0

For more in depth information regarding VAAI (like I said, mine was just a one pager), check out Chad Sakac’s blog regarding VAAI in 5.0


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