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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.
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<div class="moz-cite-prefix">On 05/12/2015 02:56 PM, Ernest Beinrohr
wrote:<br>
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<blockquote cite="mid:5551EA74.4070205@axonpro.sk" type="cite">
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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>
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<div class="moz-signature">-- <br>
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+421-2-62410360 +421-903-482603 <br>
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<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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