The dynamic nature of virtualized server pools make troubleshooting quite challenging. The technology that delivers the most benefits for business but causes the most headaches for operation is virtual machine live migration. Live migration, also known as VMotion or XenMotion in the VMWare and Xen products respectively allows you to move virtual machines from physical server to physical server without any discernible interruption. Other tools build on top of live migration and snapshot technology to offer dynamic allocation and re-allocation of machines, high availability, backup and even infrastructure-wide power management. Wonderful features for business agility. But by making virtual machines mobile this feature makes troubleshooting even harder. Add the other features and you might have machines moving around automatically and constantly. Sure, the IP address stays the same, but the network path will change and inconsistencies in network architecture will show up as intermittent failures and performance problems. This means that virtualization creates two imperatives: Collect all the logs centrally, and correlate everything against events at the virtualization layer (eg. VMotion). That way, you can cut through the abstraction transparency and see where the problem occurs.