NOTE: The Retain system requires more than space. Due to the storage of many small files, especially on systems archiving mobile message data, sufficient iNodes are also an issue. SLES 11 changed the way the EXT3 file system defaults, and unless modifications are made, the EXT3 file system on SLES 11 will become insufficient for large storage systems. For information on the limitations and how to fix it, see How to setup an EXT3 partition with more iNodes. If a substitute file system is desired, the XFS file system is flexible enough to mitigate the risk.