Server I/O remains a big challenge in virtualized environments. The results of an interesting online survey recently done by Xsigo Systems highlights these challenges. They show that users continue to suffer I/O bottlenecks, I/O related outages and spend too much time on I/O issues and cable maintenance. This comes as no surprise as the consolidation brought by server virtualization puts even more demands on I/O infrastructures. In our article on I/O virtualization we highlighted emerging vendors at VMworld 2009 that address these issues – particularly cabling and I/O related outages.