Read Dr. Stephen Tweedie's presentation, "EXT3, Journaling File System," at http://olstrans.sourceforge.net/release/OLS2000-ext3/OLS2000-ext3.html for more details.
Other journaling file systems should be supported by Ubuntu (such as reiserfs) and have similar features.
Ubuntu also supports the creation of large RAID arrays, both via software using one or more storage devices and using hardware with specific device controllers. You can also use logical volume management (LVM), a sophisticated file system handling feature that allows parts of the file system (directory layout) to span one or more portions of separate physical storage media. This feature also allows resizing of the resulting partitions if system resource requirements change after initial configuration, and while the pertinent file systems are unmounted or mounted.
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