All horribly wrong! ... who verified this article before publishing it ?!
Storage Virtualisation does not magically fix storage issues like the article suggests, it is NOT a replacement for RAID!
If you think a double disk failure in a RAID-5 set is bad wait till you see what happens when you get a double disk failure in a RAID-5 set that is incorperated into a virtualised storage pool ... Instead of hosts only using that RAID set losing storage, ALL your hosts using the pool lose their storage .. how fab is that! ;-)
It does however provide a very good method of moving your servers/applications LUNs about between storage tiers without the host being aware.
It also provides a method for better utilising your storage capacity (GB and IOPS), though you still have to be sure that you still keep data seperate that should be seperate (Logs and databases still shouldn't live in the same pool)