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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">From my experience I strongly advise to avoid a drop_caches
<div>with option 3. We still see commands hanging for hours</div>
<div>if they are issued during high CPU/memory load. Even with</div>
<div>matured Ubuntu 3.16 kernels</div>
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<div>Staying with option 1 should be enough and much more save.</div>
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<div>Markus</div>
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<div id="divRpF500092" style="direction: ltr;"><font face="Tahoma" size="2" color="#000000"><b>Von:</b> users-bounces@ovirt.org [users-bounces@ovirt.org]" im Auftrag von "Yaniv Dary [ydary@redhat.com]<br>
<b>Gesendet:</b> Sonntag, 17. Mai 2015 09:53<br>
<b>An:</b> Ernest Beinrohr; users<br>
<b>Betreff:</b> Re: [ovirt-users] ovirt-agent: is it possible to run specific actions when taking snapshots?<br>
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<pre>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 type="cite">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>
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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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<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" target="_blank">ydary@redhat.com</a>
IRC : ydary</pre>
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