The VSA is the Ugly Result of Legacy Vendor Lock-Out
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@KOOLER Limits if I recall are 1TB file size max, no virtual machines, post process only, 32KB block size (but Variable Block at least right?) 2016 should raise the limit.
Advantage to doing data reduction on the back end is you can dedupe out common applications and OS files between Virtual machines. That said flash is so cheap (~55 cents per GB for enterprise grade storage) throwing hardware at the problem has its advantages...
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They did this for the sole reason that this was the only way to continue providing their solutions based on the legacy vendors and their lock out and lack of access.
Not sure where this information came from.
PernixData, SanDisk’s Flashsoft, and ScaleIO have all used kernel modules with vSphere...The reason these vendors use VSA's is a combination of factors, largest of which writing kernel code is hard...
