__  __    __   __  _____      _            _          _____ _          _ _ 
 |  \/  |   \ \ / / |  __ \    (_)          | |        / ____| |        | | |
 | \  / |_ __\ V /  | |__) | __ ___   ____ _| |_ ___  | (___ | |__   ___| | |
 | |\/| | '__|> <   |  ___/ '__| \ \ / / _` | __/ _ \  \___ \| '_ \ / _ \ | |
 | |  | | |_ / . \  | |   | |  | |\ V / (_| | ||  __/  ____) | | | |  __/ | |
 |_|  |_|_(_)_/ \_\ |_|   |_|  |_| \_/ \__,_|\__\___| |_____/|_| |_|\___V 2.1
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<section id="global-file-system-2">
<h1>Global File System 2<a class="headerlink" href="#global-file-system-2" title="Link to this heading">ΒΆ</a></h1>
<p>GFS2 is a cluster file system. It allows a cluster of computers to
simultaneously use a block device that is shared between them (with FC,
iSCSI, NBD, etc).  GFS2 reads and writes to the block device like a local
file system, but also uses a lock module to allow the computers coordinate
their I/O so file system consistency is maintained.  One of the nifty
features of GFS2 is perfect consistency -- changes made to the file system
on one machine show up immediately on all other machines in the cluster.</p>
<p>GFS2 uses interchangeable inter-node locking mechanisms, the currently
supported mechanisms are:</p>
<blockquote>
<div><dl class="simple">
<dt>lock_nolock</dt><dd><ul class="simple">
<li><p>allows GFS2 to be used as a local file system</p></li>
</ul>
</dd>
<dt>lock_dlm</dt><dd><ul class="simple">
<li><p>uses the distributed lock manager (dlm) for inter-node locking.
The dlm is found at linux/fs/dlm/</p></li>
</ul>
</dd>
</dl>
</div></blockquote>
<p>lock_dlm depends on user space cluster management systems found
at the URL above.</p>
<p>To use GFS2 as a local file system, no external clustering systems are
needed, simply:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ mkfs -t gfs2 -p lock_nolock -j 1 /dev/block_device
$ mount -t gfs2 /dev/block_device /dir
</pre></div>
</div>
<p>The gfs2-utils package is required on all cluster nodes and, for lock_dlm, you
will also need the dlm and corosync user space utilities configured as per the
documentation.</p>
<p>gfs2-utils can be found at <a class="reference external" href="https://pagure.io/gfs2-utils">https://pagure.io/gfs2-utils</a></p>
<p>GFS2 is not on-disk compatible with previous versions of GFS, but it
is pretty close.</p>
<p>The following man pages are available from gfs2-utils:</p>
<blockquote>
<div><table class="docutils align-default">
<tbody>
<tr class="row-odd"><td><p>fsck.gfs2</p></td>
<td><p>to repair a filesystem</p></td>
</tr>
<tr class="row-even"><td><p>gfs2_grow</p></td>
<td><p>to expand a filesystem online</p></td>
</tr>
<tr class="row-odd"><td><p>gfs2_jadd</p></td>
<td><p>to add journals to a filesystem online</p></td>
</tr>
<tr class="row-even"><td><p>tunegfs2</p></td>
<td><p>to manipulate, examine and tune a filesystem</p></td>
</tr>
<tr class="row-odd"><td><p>gfs2_convert</p></td>
<td><p>to convert a gfs filesystem to GFS2 in-place</p></td>
</tr>
<tr class="row-even"><td><p>mkfs.gfs2</p></td>
<td><p>to make a filesystem</p></td>
</tr>
</tbody>
</table>
</div></blockquote>
</section>


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