Sun Project Caroline - load balanced VMs connected to a backend database

Sun Project Caroline is an interesting research project:

"Provides a dynamic virtualized grid of language-level virtual machines (VMs), networks, and storage. The principal VM is the Java Virtual Machine (JVM), but others can also be supported, such as for Perl, Python, and Ruby."

"The system makes use of multiple features of the Solaris Operating System (Solaris OS): Zones are used for VM isolation and network binding control. Resource pools and the Fair Share Scheduler are used to manage processor allocations. IP Filter is used in network connectivity control. Extended accounting facilities are used to account for CPU time and network traffic. ZFS file system features such as snapshots and clones are available to developers."
(Sun)