2:53 a.m.
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We use libvirt VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag, which uses guest agent to quiesce
all mounted file systems within the domain.
The qemu guest agent implements fsfreeze/fsthaw commands, which do the quiescing.
On 05/12/2015 02:56 PM, Ernest Beinrohr wrote:
It would be nice, if ovirt snapshots were more safe. When a VM has
the
ovirt-agent installed, ovirt could tell the agent to run site-speficic
actions. What I have in mind is:
linux vms:
- sync
- echo 3 > /proc/sys/vm/drop_caches
- zerofill empty space (this takes long but saves precious backup space)
databases:
- prepare databases for snapshot (flush,write-lock)
- send snapshot-complete and unlock
--
Ernest Beinrohr, AXON PRO
Ing <http://www.beinrohr.sk/ing.php>;, RHCE
<http://www.beinrohr.sk/rhce.php>;, RHCVA
<http://www.beinrohr.sk/rhce.php>;, LPIC
<http://www.beinrohr.sk/lpic.php>;, VCA <http://www.beinrohr.sk/vca.php>;,
+421-2-62410360 +421-903-482603
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
--
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: ydary(a)redhat.com
IRC : ydary
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<pre wrap="">We use libvirt VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag,
which uses guest agent to quiesce all mounted file systems within the domain.
The qemu guest agent implements fsfreeze/fsthaw commands, which do the quiescing.
</pre>
<br>
<br>
<div class="moz-cite-prefix">On 05/12/2015 02:56 PM, Ernest Beinrohr
wrote:<br>
</div>
<blockquote cite="mid:5551EA74.4070205@axonpro.sk"
type="cite">
<meta http-equiv="content-type" content="text/html;
charset=windows-1252">
It would be nice, if ovirt snapshots were more safe. When a VM has
the ovirt-agent installed, ovirt could tell the agent to run
site-speficic actions. What I have in mind is:<br>
<br>
linux vms:<br>
- sync<br>
- echo 3 > /proc/sys/vm/drop_caches<br>
- zerofill empty space (this takes long but saves precious backup
space)<br>
<br>
databases:<br>
- prepare databases for snapshot (flush,write-lock)<br>
- send snapshot-complete and unlock<br>
<br>
<br>
<div class="moz-signature">-- <br>
<div id="oernii_footer" style="color: gray;"> <span
style="font-family: Lucida Console, Luxi Mono, Courier,
monospace; font-size: 90%;"> Ernest Beinrohr, AXON PRO<br>
<a moz-do-not-send="true" style="text-decoration: none;
color: gray;"
href="http://www.beinrohr.sk/ing.php">Ing</a>,
<a moz-do-not-send="true" style="text-decoration: none;
color: gray;"
href="http://www.beinrohr.sk/rhce.php">RHCE</a>,
<a moz-do-not-send="true" style="text-decoration: none;
color: gray;"
href="http://www.beinrohr.sk/rhce.php">RHCVA</a>,
<a moz-do-not-send="true" style="text-decoration: none;
color: gray;"
href="http://www.beinrohr.sk/lpic.php">LPIC</a>,
<a moz-do-not-send="true" style="text-decoration: none;
color: gray;"
href="http://www.beinrohr.sk/vca.php">VCA</a>,
<br>
+421-2-62410360 +421-903-482603 <br>
</span> </div>
<img
src="http://nojsstats.appspot.com/UA-44497096-1/email.beinrohr.sk"
moz-do-not-send="true" border="0" height="1"
width="1"> </div>
<br>
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<br>
<pre wrap="">_______________________________________________
Users mailing list
<a class="moz-txt-link-abbreviated"
href="mailto:Users@ovirt.org">Users@ovirt.org</a>
<a class="moz-txt-link-freetext"
href="http://lists.ovirt.org/mailman/listinfo/users">http://...
</pre>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Yaniv Dary
Technical Product Manager
Red Hat Israel Ltd.
34 Jerusalem Road
Building A, 4th floor
Ra'anana, Israel 4350109
Tel : +972 (9) 7692306
8272306
Email: <a class="moz-txt-link-abbreviated"
href="mailto:ydary@redhat.com">ydary@redhat.com</a>
IRC : ydary</pre>
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