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<h1 id="introduction">
<a class="header" href="#introduction">Pre-installation Checklist</a>
</h1>
<h2>Check that your CPU supports hardware virtualization</h2>
<p>
To run Arclight, you need a processor that supports hardware
virtualization. Intel and AMD both have developed extensions for
their processors, deemed respectively Intel VT-x (code name
Vanderpool) and AMD-V (code name Pacifica). To see if your
processor supports one of these, you can review the output from
this command:
</p>
<pre><code class="language-sh">egrep -c '(vmx|svm)' /proc/cpuinfo</code></pre>
<ul>
<p>
If 0 it means that your CPU doesn't support hardware
virtualization.
</p>
<p>
If 1 or more it does - but you still need to make sure that
virtualization is enabled in the BIOS.
</p>
</ul>
<p>Alternatively, you may execute:</p>
<pre><code class="language-sh">kvm-ok </code></pre>
<p>which may provide an output like this:</p>
<code class="language-sh">INFO: /dev/kvm exists KVM acceleration can be used
</code>
<h2>Use a 64 bit kernel (if possible)</h2>
<p>
Running a 64 bit kernel on the host operating system is
recommended but not required.
</p>
<ul>
<p>
1. To serve more than 2GB of RAM for your VMs, you must use a
64-bit kernel. On a 32-bit kernel install, you'll be limited to
2GB RAM at maximum for a given VM.
</p>
<p>
2. Also, a 64-bit system can host both 32-bit and 64-bit guests.
A 32-bit system can only host 32-bit guests.
</p>
</ul>
<p>To see if your processor is 64-bit, you can run this command:</p>
<pre><code class="language-sh">egrep -c ' lm ' /proc/cpuinfo</code></pre>
<ul>
<p>If 0 is printed, it means that your CPU is not 64-bit.</p>
<p>
If 1 or higher, it is. Note: lm stands for Long Mode which
equates to a 64-bit CPU.
</p>
</ul>
<p>
Now see if your running kernel is 64-bit, just issue the following
command:
</p>
<pre><code class="language-sh">uname -m</code></pre>
<p>
x86_64 indicates a running 64-bit kernel. If you use see i386,
i486, i586 or i686, you're running a 32-bit kernel. Note: x86_64
is synonymous with amd64.
</p>
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