For those of you not familiar with file systems available on Linux, the most
popular ones are:  the original "ext2" which morphed into the current "ext3"
journaled filesystem; "jfs" is a filesystem written and supported by IBM;
"reiserfs" is designed by a highly intelligent and hard to deal with geek by
the name of Reiser; and "xfs" (not to be confused with "xfs" the X font
server), the file system developed by SGI for Irix OS and ported to Linux
which I believe is now the primary development platform.  XFS is a large
scale and high performance file system with just about every file system
capability I can imagine.  Here is the web link:
http://oss.sgi.com/projects/xfs/

There is little, if anything, that a business application needs to know
about XFS, but it is good to know that no one is going to run out of
capacity with it, and all of its capabilities are available "behind the
wall" to PM programmers and 3rd party developers.  Some functionality could
be exposed through SM intrinsics and utilities also.

- Pete