As mentioned, ensure that your array is in the HCL that supports VAAI, but also make sure the array has the firmware that supports it. Most arrays will need an upgrade in the firmware to bring turn on this feature. You also want to make sure you're running ESX(i) 4.1 and again, depending on the array vendor, you may need to install packages on the host (e.g. 3par, you need to install 3par VAAI modules before using it).
You should take a look at using esxtop under "u" option and view the VAAI statistics, if they're changing depending on the type of test, then you're making using of the new VAAI SCSI primitives.
From your current message, the host is unable to determine if VAAI is supported. I would verify that you meet all requirements and try again.
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William Lam
VMware vExpert 2009,2010
VMware VCP3,4
VMware VCAP4-DCA
VMware scripts and resources at:
Getting Started with the vMA (tips/tricks)
Getting Started with the vSphere SDK for Perl
VMware Code Central - Scripts/Sample code for Developers and Administrators
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