6:56 a.m.
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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:
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
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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>
<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 style="text-decoration: none; color: gray;"
href="http://www.beinrohr.sk/ing.php">Ing</a>, <a
style="text-decoration: none; color: gray;"
href="http://www.beinrohr.sk/rhce.php">RHCE</a>, <a
style="text-decoration: none; color: gray;"
href="http://www.beinrohr.sk/rhce.php">RHCVA</a>, <a
style="text-decoration: none; color: gray;"
href="http://www.beinrohr.sk/lpic.php">LPIC</a>, <a
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>
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src="http://nojsstats.appspot.com/UA-44497096-1/email.beinrohr.sk"
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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>
<fieldset class="mimeAttachmentHeader"></fieldset>
<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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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@redhat.com<mailto:ydary@redhat.com IRC :
ydary
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Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<html dir=3D"ltr" <head <meta http-equiv=3D"Content-Type"
content=3D"text/html; charset=3Diso-8859-=
1" <style type=3D"text/css"
id=3D"owaParaStyle"></style
</head <body
bgcolor=3D"#FFFFFF" fpstyle=3D"1" ocsi=3D"0" <div style=3D"direction: ltr;font-family: Tahoma;color:
#000000;font-size: =
10pt;" <div>if they are issued during
high CPU/memory load. Even with</div
<div>matured Ubuntu 3.16 kernels</div
<div><br </div <div>Staying with option 1 should be enough and much more
save.</div <div><br </div
<div>Markus</div <div><br </div
<div <div style=3D"font-family:
Times New Roman; color: #000000; font-size: 16px=
" <hr tabindex=3D"-1" <div
id=3D"divRpF500092" style=3D"direction: ltr;"><font
face=3D"Tahoma" si=
ze=3D"2" color=3D"#000000"><b>Von:</b>
users-bounces(a)ovirt.org [users-bounc=
es(a)ovirt.org]&quot; im Auftrag von "Yaniv Dary [ydary(a)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 specif=
ic actions when taking snapshots?<br
</font><br </div <div></div
<div <pre>We use libvirt
VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag, which uses gue=
st agent to quiesce all mounted file systems within the domain.=0A=
The qemu guest agent implements fsfreeze/fsthaw commands, which do the quie=
scing.=0A=
</pre <br
<br <div
class=3D"moz-cite-prefix">On 05/12/2015 02:56 PM, Ernest Beinrohr wrot=
e:<br </div <blockquote type=3D"cite">It would be nice, if
ovirt snapshots were more sa=
fe. 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=3D"moz-signature">-- <br <div
id=3D"oernii_footer" style=3D"color:gray"><span
style=3D"font-family:L=
ucida Console,Luxi Mono,Courier,monospace; font-size:90%">Ernest Beinrohr, =
AXON PRO<br <a
href=3D"http://www.beinrohr.sk/ing.php" style=3D"text-decoration:none; c=
olor:gray" target=3D"_blank">Ing</a>,
<a href=3D"http://www.beinrohr.sk/rhce.php"
style=3D"text-decoration:none; =
color:gray" target=3D"_blank"
RHCE</a>, <a href=3D"http://www.beinrohr.sk/rhce.php"
style=3D"text-decorat=
ion:none; color:gray" target=3D"_blank"
RHCVA</a>, <a href=3D"http://www.beinrohr.sk/lpic.php"
style=3D"text-decora=
tion:none; color:gray" target=3D"_blank"
LPIC</a>, <a href=3D"http://www.beinrohr.sk/vca.php"
style=3D"text-decorati=
on:none; color:gray" target=3D"_blank"
VCA</a>, <br +421-2-62410360
+421-903-482603 <br </span></div <img
src=3D"http://nojsstats.appspot.com/UA-44497096-1/email.beinrohr.sk&... h=
eight=3D"1" width=3D"1" border=3D"0" </div
<br <fieldset
class=3D"mimeAttachmentHeader" target=3D"_blank"></fieldset>
<br <pre>_______________________________________________=0A=
Users mailing list=0A=
<a class=3D"moz-txt-link-abbreviated"
href=3D"mailto:Users@ovirt.org" targe=
t=3D"_blank">Users(a)ovirt.org</a>=0A=
<a class=3D"moz-txt-link-freetext"
href=3D"http://lists.ovirt.org/mailman/l=
istinfo/users"
target=3D"_blank">http://lists.ovirt.org/mailman/listinfo/us=
ers</a>=0A=
</pre </blockquote <br <pre
class=3D"moz-signature" cols=3D"72">-- =0A=
Yaniv Dary=0A=
Technical Product Manager=0A=
Red Hat Israel Ltd.=0A=
34 Jerusalem Road=0A=
Building A, 4th floor=0A=
Ra'anana, Israel 4350109=0A=
=0A=
Tel : +972 (9) 7692306=0A=
8272306=0A=
Email: <a class=3D"moz-txt-link-abbreviated"
href=3D"mailto:ydary@redhat.co=
m" target=3D"_blank">ydary(a)redhat.com</a>=0A=
IRC : ydary</pre </div </div
</div </div </body
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From my experience I strongly advise to avoid a drop_caches
with
option 3. We still see commands hanging for hours
if they are issued during high CPU/memory load. Even with
matured Ubuntu 3.16 kernels
Staying with option 1 should be enough and much more save.
Markus
________________________________
Von: users-bounces(a)ovirt.org [users-bounces(a)ovirt.org]" im Auftrag von "Yan=
iv Dary [ydary(a)redhat.com]
Gesendet: Sonntag, 17. Mai 2015 09:53
An: Ernest Beinrohr; users
Betreff: Re: [ovirt-users] ovirt-agent: is it possible to run specific acti=
ons when taking snapshots?
We use libvirt VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag, which uses guest ag=
ent to quiesce all mounted file systems within the domain.
The qemu guest agent implements fsfreeze/fsthaw commands, which do the quie=
scing.
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 ovir=
t-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.p=
hp>, VCA<http://www.beinrohr.sk/vca.php>,
+421-2-62410360 +421-903-482603
_______________________________________________
Users mailing list
Users@ovirt.org<mailto:Users@ovirt.orgFrom my experience I strongly advise to
avoid a drop_caches
<div>with option 3. We still see commands hanging for
hours</div
3278
days inactive
3283
days old
2 comments
3 participants
participants (3)
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Markus Stockhausen -
Yaniv Dary