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<h2><!-- Start Project Content -->
<font face="ARIAL NARROW,HELVETICA" size="5"><b>XFS: A high-performance<br>
            journaling file system</b></font><i><br>

<font size="2">URL: http://oss.sgi.com/projects/xfs/</font></i></h2>

<p>Ever had to wait and wait while Linux `fsck's a big filesystem
after a crash, power failure or just routine verification ?</p>
<p>Ever wanted to support terabytes of databases, tens of thousands
of files per directory, 64-bit of everything in the filesystem,
with high reliability and high performance ?</p>

<p>Ever wondered how far a filesystem can scale assuming the rest
of the kernel can? How many CPUs can actually write to the filesystem
at the same time without interfering with each other?</p>
<center>
<p><img src="images/xfs_GPL.jpg" width="300" height="283"
    align="BOTTOM" naturalsizeflag="3"></p>
</center>

<div align="left">
<p>
This site includes a preview of the
<font color="#cc6600"><b>Open Source</b></font>
<font color="#880055"><b>XFS<sup><font size="-2">TM</font></sup>
filesystem:</b></font>
an <font color="#cc6600">OSI Certified Open Source</font>
journaling file system soon to be available as free software for
<font color="#cc6600">Linux</font>, licensed with the
<font color="#cc6600">GNU General Public License (GPL)</font>.

<p></p>
</div>
<center>
<h2><font face="ARIAL NARROW,HELVETICA"><b>XFS Features:</b></font></h2>
</center>
<div align="left">
<ul>
	<li>
	<h4>Sub-second filesystem recovery after crashes or power failures
	(never wait for long <code>fscks</code> again)</h4>

	<li>
	<h4>64-bit scalability:
	millions of terabytes, millions of files, and a million
	files per directory (no more 2 GB limits)</h4>

	<li>
	<h4>High reliability
	and performance from journaling and other advanced algorithms</h4>
</ul>
</div>

<p>
At the Atlanta Linux Showcase, SGI presented the following paper on
the port of XFS to Linux:

<ul>
	<li><a href="papers/als/als.ps"> Porting the SGI XFS File System to Linux
	(October 1999)</a><br>

</ul>

<p>
At the 6th Linux Kongress &amp; the Linux Storage Management Workshop (LSMW) in
Germany in September, 1999, SGI had a few presentations including the
following:

<ul>
	<li><a href="papers/linux_kongress/index.htm"> SGI's port of XFS to Linux
	(September 1999)</a><br>

	<li><a href="papers/DMF-over/index.htm">Overview of DMF
	(September 1999)</a><br>
</ul>

<p>
At the LinuxWorld Conference &amp; Expo in August 1999, SGI published:</p>

<ul>
	<li><a href="papers/xfs_GPL.pdf">An Open Source XFS data sheet
	(August 1999)</a><br>

	<li><a href="papers/IRIX_xfs_data_sheet.pdf">An IRIX-XFS
	data sheet (July 1999)</a><br>

	<li><a href="download/">Some initial XFS source code
	copylefted with the GNU GPL license</a> (Selected IRIX XFS
	routines that implement XFS journaling)

	<li><a href="design_docs/">Selected original 1993 XFS
	design documents</a>

	<li><a href="papers/xfs_usenix/index.html">An XFS white paper
	from the 1996 USENIX conference</a>.
</ul>


<p>
This initial publication of excerpts of XFS source code
indicates SGI's commitment to port XFS to Linux as GPL code.
This code can be freely used with Linux, without the worry
of violating the GPL terms by mixing copylefted GPL and
copyrighted non-GPL code in Linux. It also shows some interesting
code (originally developed for IRIX) which implements the XFS
journaling techniques.</p>

<p>
SGI programmers are cleaning the XFS code of legal encumbrances
and porting it to Linux. SGI is working with universities, European
and American companies, and Government laboratories which have
volunteered experienced Linux and filesystem programmers and other
resources to help SGI in this Open Source porting process.
The bazaar is opening for XFS and the Open Source process
is working to accelerate time to market while increasing
functionality and reliability.

<p>
Please bear with us as we finish these processes so we can
publish a full set of buildable and testable Open Source
Linux XFS source code.</p>

<p>You can also check out the following:</p>
<ul>
	<li>The <a href="http://www.sgi.com/Technology/xfs-whitepaper.html">Original XFS white paper</a>, back from the early days it didn't yet have quota support. Yes, it has it now.
	<li>Press release #1: <a href="http://www.sgi.com/newsroom/press_releases/1999/may/xfs.html">SGI Contributes World's Most Scalable File System Technology to Open Source Community</a>
	<li>Some <a href="old/postings/">related discussions</a> on the kernel mailing list.
	<li>A <a href="http://www.linuxworld.com/linuxworld/lw-1999-05/lw-05-sgi.html">Linux World article</a>
</ul>


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