James Morle published an article some time ago entitled "Sane SAN", it discussed the practicalities allocating database storage from a SAN. One of the points it touched on was the danger of being given an amount of storage without knowing how many physical spindles it was spread across. This was before virtualization took off, the problem being that there may be several layers of virtualization before you get down to the physical disks. For example, Hewlett Packard produce something called the Enterprise Virtual Array, this aggregates trays of storage into virtual arrays. With another product called SVM, which, off the top of my head stands for something like storage virtual manager, these virtual arrays can be pooled into virtual SANs.
On the subject of virtualization, the "Oracle Storage Guy" compares the price performance of Oracle RAC versus Oracle standard edition on clustered VMWare, with some caveats, clustered VMWare comes out the winner. This provides serious food for thought as to where it is best to carry out the clustering in the technology stack.
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