VastSky is a cluster storage system that creates logical volumes across multiple servers and disks for virtual machines to use. It is scalable, high available and provides good performance through load balancing of I/O across physical disks. The code is now open source and it aims to integrate with Xen/XCP virtualization software to provide shared storage for virtual machines. Further improvements are planned to enhance scalability, add snapshot capabilities, and support active-active clustering configurations.