Re: [ovirt-users] oVirt VM backup and restore

9 Mar 2017


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Le 09/03/2017 =C3=A0 10:25, Gianluca Cecchi a =C3=A9crit :
...
On Wed, Mar 8, 2017 at 6:05 PM, Gianluca Cecchi=20
<gianluca.cecchi@gmail.com <mailto:gianluca.cecchi@gmail.com>> wrote:
NOTE: during the snapshot creation I see in web admin console the
    VM in paused state and also not responsive in both console and ssh
    session.
    After a couple of seconds it comes back and as a confirmation I
    see this in its messages:
Mar  8 17:38:57 T-ORACLE73 chronyd[616]: System clock wrong by
    19.077230 seconds, adjustment started
Is this expected?
Possibly the default changed at some point in time, so that now it=20
saves memory and so this implies pause of VM
Saving memory is essential in some ap=C3=A0plications like DB, so you won=
't=20
bypass vm pauses for such a stuff
In the mean time I verified changing backup.py this way solves the=20
problem (the 3.6 api deprecation still in place... ;-):
$ diff backup.py backup.py.orig
123c123
<=20
vm.snapshots.add(params.Snapshot(description=3Dconfig.get_snapshot_desc=
ription(),=20
vm=3Dvm,persist_memorystate=3DFalse))
---
...
=20
vm.snapshots.add(params.Snapshot(description=3Dconfig.get_snapshot_desc=
ription(),=20
vm=3Dvm))
The snapshot doesn't include memory and no problem at VM OS side now
Tested also getting the parameter from config file
Modifications needed in this case:
1)
$ diff backup.py backup.py.orig
123c123
<=20
vm.snapshots.add(params.Snapshot(description=3Dconfig.get_snapshot_desc=
ription(),=20
vm=3Dvm,persist_memorystate=3Dconfig.get_persist_memorystate()))
---
...
=20
vm.snapshots.add(params.Snapshot(description=3Dconfig.get_snapshot_desc=
ription(),=20
vm=3Dvm))
2)
$ diff config.py config.py.orig
34d33
<             self.__persist_memorystate =3D=20
config_parser.getboolean(section, "persist_memorystate")
113,116d111
<
<
<     def get_persist_memorystate(self):
<         return self.__persist_memorystate
And in config file called add:
# Save Memory in snapshot
persist_memorystate=3DFalse
It could be further improved if one wants to differentiate save memory=20
for some VMs and not for other ones....
HIH other ones,
Gianluca
--=20
Nathana=C3=ABl Blanchet

Supervision r=C3=A9seau
P=C3=B4le Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5 =09
T=C3=A9l. 33 (0)4 67 54 84 55
Fax  33 (0)4 67 54 84 14
blanchet@abes.fr


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    <br>
    <div class=3D"moz-cite-prefix">Le 09/03/2017 =C3=A0 10:25, Gianluca C=
ecchi
      a =C3=A9crit=C2=A0:<br>
    </div>
    <blockquote
cite=3D"mid:CAG2kNCy-F6KF0ckEbFqWuXYQkroMZRVigPHvuhsrK=3DEvBBOTpQ@mail.gm=
ail.com"
      type=3D"cite">
      <div dir=3D"ltr">
        <div class=3D"gmail_extra">
          <div class=3D"gmail_quote">On Wed, Mar 8, 2017 at 6:05 PM,
            Gianluca Cecchi <span dir=3D"ltr"><<a
                moz-do-not-send=3D"true"
                href=3D"mailto:gianluca.cecchi@gmail.com" target=3D"_blan=
k">gianluca.cecchi@gmail.com</a>></span>
            wrote:<br>
            <blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px
              0.8ex;border-left:1px solid
              rgb(204,204,204);padding-left:1ex">
              <div dir=3D"ltr">
                <div class=3D"gmail_extra">
                  <div class=3D"gmail_quote"><br>
                    <div><br>
                    </div>
                    <div>NOTE: during the snapshot creation I see in web
                      admin console the VM in paused state and also not
                      responsive in both console and ssh session.</div>
                    <div>After a couple of seconds it comes back and as
                      a confirmation I see this in its messages:</div>
                    <div><br>
                    </div>
                    <div>Mar =C2=A08 17:38:57 T-ORACLE73 chronyd[616]: Sy=
stem
                      clock wrong by 19.077230 seconds, adjustment
                      started<br>
                    </div>
                    <div><br>
                    </div>
                    <div>Is this expected?</div>
                    <div><br>
                    </div>
                    <span class=3D"gmail-HOEnZb"><font color=3D"#888888">
                        <div><br>
                        </div>
                        <div><br>
                        </div>
                      </font></span></div>
                </div>
              </div>
            </blockquote>
          </div>
          <br>
        </div>
        <div class=3D"gmail_extra">Possibly the default changed at some
          point in time, so that now it saves memory and so this implies
          pause of VM</div>
      </div>
    </blockquote>
    Saving memory is essential in some ap=C3=A0plications like DB, so you
    won't bypass vm pauses for such a stuff<br>
    <blockquote
cite=3D"mid:CAG2kNCy-F6KF0ckEbFqWuXYQkroMZRVigPHvuhsrK=3DEvBBOTpQ@mail.gm=
ail.com"
      type=3D"cite">
      <div dir=3D"ltr">
        <div class=3D"gmail_extra">In the mean time I verified changing
          backup.py this way solves the problem (the 3.6 api deprecation
          still in place... ;-):</div>
        <div class=3D"gmail_extra"><br>
        </div>
        <div class=3D"gmail_extra">
          <div class=3D"gmail_extra">$ diff backup.py backup.py.orig=C2=A0=
</div>
          <div class=3D"gmail_extra">123c123</div>
          <div class=3D"gmail_extra">< =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0
vm.snapshots.add(params.Snapshot(description=3Dconfig.get_snapshot_descri=
ption(),
            vm=3Dvm,persist_memorystate=3DFalse))</div>
          <div class=3D"gmail_extra">---</div>
          <div class=3D"gmail_extra">> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0
vm.snapshots.add(params.Snapshot(description=3Dconfig.get_snapshot_descri=
ption(),
            vm=3Dvm))</div>
          <div class=3D"gmail_extra"><br>
          </div>
          <div class=3D"gmail_extra">The snapshot doesn't include memory
            and no problem at VM OS side now</div>
          <div class=3D"gmail_extra"><br>
          </div>
          <div class=3D"gmail_extra">Tested also getting the parameter
            from config file</div>
          <div class=3D"gmail_extra"><br>
          </div>
          <div class=3D"gmail_extra">Modifications needed in this case:</=
div>
          <div class=3D"gmail_extra"><br>
          </div>
          <div class=3D"gmail_extra">1)</div>
          <div class=3D"gmail_extra">$ diff backup.py backup.py.orig=C2=A0=
<br>
          </div>
          <div class=3D"gmail_extra">
            <div class=3D"gmail_extra">123c123</div>
            <div class=3D"gmail_extra">< =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0
vm.snapshots.add(params.Snapshot(description=3Dconfig.get_snapshot_descri=
ption(),
vm=3Dvm,persist_memorystate=3Dconfig.get_persist_memorystate()))</div>
            <div class=3D"gmail_extra">---</div>
            <div class=3D"gmail_extra">> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0
vm.snapshots.add(params.Snapshot(description=3Dconfig.get_snapshot_descri=
ption(),
              vm=3Dvm))</div>
            <div><br>
            </div>
            <div><br>
            </div>
            <div>2)</div>
            <div>
              <div>$ diff config.py config.py.orig=C2=A0</div>
              <div>34d33</div>
              <div>< =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 self.__=
persist_memorystate =3D
                config_parser.getboolean(section, "persist_memorystate")<=
/div>
              <div>113,116d111</div>
              <div><=C2=A0</div>
              <div><=C2=A0</div>
              <div>< =C2=A0 =C2=A0 def get_persist_memorystate(self):<=
/div>
              <div>< =C2=A0 =C2=A0 =C2=A0 =C2=A0 return self.__persist=
_memorystate</div>
            </div>
            <div><br>
            </div>
            <div><br>
            </div>
            <div>And in config file called add:</div>
            <div><br>
            </div>
          </div>
          <div>
            <div># Save Memory in snapshot</div>
            <div>persist_memorystate=3DFalse</div>
          </div>
          <div><br>
          </div>
          <div>It could be further improved if one wants to
            differentiate save memory for some VMs and not for other
            ones....</div>
          <div><br>
          </div>
          <div>HIH other ones,</div>
          <div>Gianluca</div>
        </div>
      </div>
    </blockquote>
    <br>
    <pre class=3D"moz-signature" cols=3D"72">--=20
Nathana=C3=ABl Blanchet

Supervision r=C3=A9seau
P=C3=B4le Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5 =09
T=C3=A9l. 33 (0)4 67 54 84 55
Fax  33 (0)4 67 54 84 14
<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:blanchet@abes.fr">bl=
anchet@abes.fr</a> </pre>
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Re: [ovirt-users] oVirt VM backup and restore

Nathanaël Blanchet