I recently had to do a virtualization demo for a client. The need was to show a particular application stack running under ESXi, using storage mounted from a SAN. This all needed to be portable, inexpensive, and completed quickly. The requirements limited me to stuff I could find quickly, and that would work. As such, I really only considered FreeNAS, OpenFiler, and Windows Storage Server since they were all readily available.
I ended-up using FreeNAS, and was actually quite impressed.
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