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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>2.2. Dual-primary mode</title><link rel="stylesheet" type="text/css" href="default.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.79.1" /><link rel="home" href="drbd-users-guide.html" title="The DRBD User’s Guide" /><link rel="up" href="ch-features.html" title="Chapter 2. DRBD Features" /><link rel="prev" href="ch-features.html" title="Chapter 2. DRBD Features" /><link rel="next" href="s-replication-protocols.html" title="2.3. Replication modes" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">2.2. Dual-primary mode</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch-features.html">Prev</a> </td><th width="60%" align="center">Chapter 2. DRBD Features</th><td width="20%" align="right"> <a accesskey="n" href="s-replication-protocols.html">Next</a></td></tr></table><hr /></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="s-dual-primary-mode"></a>2.2. Dual-primary mode</h2></div></div></div><p>In dual-primary mode, a resource is, at any given time, in the
primary role on both cluster nodes. Since concurrent access to the
data is thus possible, this mode requires the use of a shared cluster
file system that utilizes a distributed lock manager. Examples include
<a class="link" href="ch-gfs.html" title="Chapter 11. Using GFS2 with DRBD">GFS</a> and <a class="link" href="ch-ocfs2.html" title="Chapter 12. Using OCFS2 with DRBD">OCFS2</a>.</p><p>Deploying DRBD in dual-primary mode is the preferred approach for
load-balancing clusters which require concurrent data access from two
nodes. This mode is disabled by default, and must be enabled
explicitly in DRBD’s configuration file.</p><p>See <a class="xref" href="s-enable-dual-primary.html" title="6.8. Enabling dual-primary mode">Section 6.8, “Enabling dual-primary mode”</a> for information on enabling dual-primary
mode for specific resources.</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch-features.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch-features.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="s-replication-protocols.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 2. DRBD Features </td><td width="20%" align="center"><a accesskey="h" href="drbd-users-guide.html">Home</a></td><td width="40%" align="right" valign="top"> 2.3. Replication modes</td></tr></table></div></body></html>
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