SGI's XVM Volume Manager provides a logical organization to disk storage that enables an administrator to combine underlying physical storage devices into a single logical unit, known as a logical volume. A logical volume allows a filesystem to be larger than the size of a physical device. Using logical volumes can also increase I/O performance and data protection because a volume can be striped across more than one physical device and logical volumes can be used to mirror data on different devices.
XVM volume management is integrated with SGI InfiniteStorage Filesystem XFS® and CXFS™. Fully embraced by the open source community, XFS provides full 64-bit file capabilities and easily scales from gigabytes to exabytes to handle extremely large files. CXFS extends XFS into a shared environment allowing simultaneous filesystem access to multiple systems running different operating systems. CXFS provides no-compromise data sharing, enhanced workflow, and reduced costs in data-intensive environments. The XFS and CXFS file systems are integrated with XVM volume management, guaranteed rate I/O, and journaling technology for fast, reliable recovery.