While adoption of server virtualization is proceeding at a gallop, the effort to refine virtualization security reached only a slow trot in 2009. Roughly 18% of server workloads have been virtualized, and research firm Gartner expects that number to climb to 28% in 2010 and almost 50% by 2012. But adapting traditional firewall, intrusion detection, antimalware and other types of security and monitoring software to run optimally in this radically changed hypervisor-based architecture is still very much a work in progress.