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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>6.7. Downgrading DRBD 8.4 to 8.3</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-admin.html" title="Chapter 6. Common administrative tasks" /><link rel="prev" href="s-upgrading-drbd.html" title="6.6. Upgrading DRBD" /><link rel="next" href="s-enable-dual-primary.html" title="6.8. Enabling dual-primary mode" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">6.7. Downgrading DRBD 8.4 to 8.3</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="s-upgrading-drbd.html">Prev</a> </td><th width="60%" align="center">Chapter 6. Common administrative tasks</th><td width="20%" align="right"> <a accesskey="n" href="s-enable-dual-primary.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-downgrading-drbd84"></a>6.7. Downgrading DRBD 8.4 to 8.3</h2></div></div></div><p>If you’re currently running DRBD 8.4 and would like to revert to 8.3
there are several steps you will have to follow. This section assumes
you still have the 8.4 kernel module and 8.4 utilities installed.</p><p>Stop any services accessing the DRBD resources, unmount, and demote
the devices to Secondary. Then perform the following commands.</p><div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Note"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="images/note.png" /></td><th align="left">Note</th></tr><tr><td align="left" valign="top"><p>These steps will have to be completed on both servers.</p></td></tr></table></div><pre class="screen">drbdadm down all
drbdadm apply-al all
rmmod drbd</pre><p>If you’re using the LINBIT repositories you can remove the packages using
<code class="literal">apt-get remove drbd8-utils drbd8-module-`uname -r`</code> or
<code class="literal">yum remove drbd kmod-drbd</code></p><p>Now that 8.4 is removed reinstall 8.3. You can do this either by changing
your repositories back to the 8.3 repos, or by following the steps located
<a class="ulink" href="http://www.drbd.org/users-guide-8.3/p-build-install-configure.html" target="_blank">in the
8.3 User’s Guide</a></p><div class="warning" style="margin-left: 0.5in; margin-right: 0.5in;"><table border="0" summary="Warning"><tr><td rowspan="2" align="center" valign="top" width="25"><img alt="[Warning]" src="images/warning.png" /></td><th align="left">Warning</th></tr><tr><td align="left" valign="top"><p>If you migrated your configs to the 8.4 format be sure to revert
them back to the 8.3 format. See <a class="xref" href="s-recent-changes-config.html" title="A.2. Changes to the configuration syntax">Section A.2, “Changes to the configuration syntax”</a> for the options
you need to revert.</p></td></tr></table></div><p>Once 8.3 is re-installed you can start your DRBD resources either manually
using <code class="literal">drbdadm</code> or <code class="literal">/etc/init.d/drbd start</code>.</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="s-upgrading-drbd.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch-admin.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="s-enable-dual-primary.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6.6. Upgrading DRBD </td><td width="20%" align="center"><a accesskey="h" href="drbd-users-guide.html">Home</a></td><td width="40%" align="right" valign="top"> 6.8. Enabling dual-primary mode</td></tr></table></div></body></html>
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