This one is a typical example of a heterogeneity that will remain till hypervisor won't be sold anymore as a cool thing. Anyways, to put it simply: Not every business unit looks at Virtualization as a saviour to their woes, they also look in direction of optimizing the existing data silos and to extract maximum business value from that optimization without any extra management overhead that virtualization may incur.
Instead, Fidelity National selected Hewlett-Packard's proprietary Integrated Archive Platform (formerly called RISS) that created a new information silo within Fidelity National. From a pure consolidation and virtualization perspective, it was incompatible with the company's existing storage infrastructure and introduced a new management interface. But with it, Fidelity National could grow incrementally, buy on a quarterly basis and meet its compliance objectives while eliminating the day-to-day management problems that competing products introduced.
Information silos are alive and well in today's data centers. Though IT staffs are under increasing pressure to consolidate and virtualize their infrastructure, companies are still finding value in creating information silos because simplicity and ease of management for some applications still outweigh whatever benefits consolidation and virtualization may deliver.