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<div class="moz-cite-prefix">Kenneth, if you use qcow2 copy-on-write
with a preplaced or shared base image, non-persistent VMs will be
as fast as persistent ones with shared TM.<br>
<pre class="moz-signature" cols="72">Gerard Bernabeu
FermiCloud and FermiGrid Services at Fermilab
Phone (+1) 630-840-6509</pre>
On 09/03/2013 08:41 AM, Carlos Martín Sánchez wrote:<br>
</div>
<blockquote
cite="mid:CAEPYvFKUe5VGFqQ99yCR6e79FXJk0adhYr4rALMU2KqsMzu1cQ@mail.gmail.com"
type="cite">
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<div dir="ltr">Hi,
<div><br>
</div>
<div>As you said, the main difference is that persistent Images
will retain the changes made when the VM is shutdown. Because
of this, persistent Images can only be used by one VM at a
time, while non-persistent ones can be used by several VMs.</div>
<div><br>
</div>
<div>A persistent Image will have a faster deploying time
(prolog phase), depending on your storage configuration [1].
For example, for the shared TM the deployment will be
immediate [2], whereas for the shared TM the deployment time
will be the same [3].</div>
<div><br>
</div>
<div>Regards</div>
<div><br>
</div>
<div>[1] <a moz-do-not-send="true"
href="http://opennebula.org/documentation:rel4.2:sm">http://opennebula.org/documentation:rel4.2:sm</a><br>
</div>
<div>[2] <a moz-do-not-send="true"
href="http://opennebula.org/documentation:rel4.2:fs_ds#persistent_non_persistent_images">http://opennebula.org/documentation:rel4.2:fs_ds#persistent_non_persistent_images</a><br>
</div>
<div>[3] <a moz-do-not-send="true"
href="http://opennebula.org/documentation:rel4.2:fs_ds#persistent_non_persistent_images1">http://opennebula.org/documentation:rel4.2:fs_ds#persistent_non_persistent_images1</a><br>
</div>
</div>
<div class="gmail_extra">
<br clear="all">
<div>
<div dir="ltr">--<br>
Join us at <a moz-do-not-send="true"
href="http://opennebulaconf.com" target="_blank">OpenNebulaConf2013</a>
in Berlin, 24-26 September, 2013<br>
--
<div>Carlos Martín, MSc<br>
Project Engineer<br>
OpenNebula - The Open-source Solution for Data Center
Virtualization
<div>
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<br>
<div class="gmail_quote">On Tue, Sep 3, 2013 at 10:04 AM,
Kenneth <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:kenneth@apolloglobal.net" target="_blank">kenneth@apolloglobal.net</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div style="font-family:Verdana,Geneva,sans-serif">
<p>What the difference between non persistent and
persistent image?</p>
<p>- are the changes not saved on a non persistent image?</p>
<p>- is one faster than the other?</p>
<span class="HOEnZb"><font color="#888888">
<p> </p>
<div>
<pre>--
Thanks,
Kenneth</pre>
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