Firstly I think you need to ask your question again with a little more information regarding what you really need to find out.
If you are simply asking what can virtualization offer the customers, the answers are multiple: Reduce costs, More efficient use of computer resources, faster deployment of servers, savings on power costs and cooling costs, possibility to migrate powered-on servers from one ESX server to another, Configure high availability, use snapshot technology. Restore machines faster. Provide cost effective labs.
and thats just for starters....
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Reduced cooling costs, electrical costs..... My own example I was able to reduce from 20+ systems to 5 systems which removed Power Distribution Units, a bunch of switches, disk trays and other sundry systems that were no longer needed. Cooling costs have gone down. Electricity costs have gone down. Maintenance contracts on systems have decreased.
Those are just for starters....
Edward L. Haletky
VMware Communities User Moderator, VMware vExpert 2009
Author of the book 'VMWare ESX Server in the Enterprise: Planning and Securing Virtualization Servers', Copyright 2008 Pearson Education.
Blue Gears and SearchVMware Pro Blogs -- Top Virtualization Security Links -- Virtualization Security Round Table Podcast
here's a link to a book which may be useful
Key benefits are likely to include:
The virtualization suite was introduced to achieve the following demands;
• Controlling server sprawl in local datacenter by;
o Consolidation of existing servers
o Containment for new servers
The target business benefits are as follows;
• Meeting workload deliveries in real time.
• Simplifying process for server provisioning
• Reducing carbon footprints
• Reducing datacenter overheads resulting from huge power/cooling demands.
• Standardisation of datacenter
• Simplified business continuity solutions
• Simplified datacenter security
• Datacenter management from single window
Hope this helps