Along with today's server hardware announcement, Apple today also released XSAN 2, a totally revamped version of its high-performance shared disk file system for Mac OS X.
Xsan is an Apple branded version of Quantum's StorNext File System software with minor enhancements designed for Apple's Mac OS X operating system. Xsan enables the sharing of one or more Xserve RAID devices with multiple Xserve or Macintosh systems. Xsan will also work with third party fibre channel storage devices with limited support from Apple. With the Xsan file system installed, these computers can read and write to the same storage volume at the same time.