From blanchet at abes.fr Thu Mar 9 10:39:40 2017 Content-Type: multipart/mixed; boundary="===============3643326409701586998==" MIME-Version: 1.0 From: =?utf-8?q?Nathana=C3=ABl_Blanchet_=3Cblanchet_at_abes=2Efr=3E?= To: users at ovirt.org Subject: Re: [ovirt-users] oVirt VM backup and restore Date: Thu, 09 Mar 2017 11:39:35 +0100 Message-ID: <2c00e42b-1a6f-b718-2d3b-7ccc8df7cc78@abes.fr> In-Reply-To: CAG2kNCy-F6KF0ckEbFqWuXYQkroMZRVigPHvuhsrK=EvBBOTpQ@mail.gmail.com --===============3643326409701586998== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable This is a multi-part message in MIME format. --------------DF760123B34BA11C0A26BA44 Content-Type: text/plain; charset=3Dutf-8; format=3Dflowed Content-Transfer-Encoding: quoted-printable Le 09/03/2017 =3DC3=3DA0 10:25, Gianluca Cecchi a =3DC3=3DA9crit : > On Wed, Mar 8, 2017 at 6:05 PM, Gianluca Cecchi=3D20 > > 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=3D20 > saves memory and so this implies pause of VM Saving memory is essential in some ap=3DC3=3DA0plications like DB, so you w= on=3D 't=3D20 bypass vm pauses for such a stuff > In the mean time I verified changing backup.py this way solves the=3D20 > problem (the 3.6 api deprecation still in place... ;-): > > $ diff backup.py backup.py.orig > 123c123 > <=3D20 > vm.snapshots.add(params.Snapshot(description=3D3Dconfig.get_snapshot_desc= =3D ription(),=3D20 > vm=3D3Dvm,persist_memorystate=3D3DFalse)) > --- > >=3D20 > vm.snapshots.add(params.Snapshot(description=3D3Dconfig.get_snapshot_desc= =3D ription(),=3D20 > vm=3D3Dvm)) > > 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 > <=3D20 > vm.snapshots.add(params.Snapshot(description=3D3Dconfig.get_snapshot_desc= =3D ription(),=3D20 > vm=3D3Dvm,persist_memorystate=3D3Dconfig.get_persist_memorystate())) > --- > >=3D20 > vm.snapshots.add(params.Snapshot(description=3D3Dconfig.get_snapshot_desc= =3D ription(),=3D20 > vm=3D3Dvm)) > > > 2) > $ diff config.py config.py.orig > 34d33 > < self.__persist_memorystate =3D3D=3D20 > 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=3D3DFalse > > It could be further improved if one wants to differentiate save memory=3D= 20 > for some VMs and not for other ones.... > > HIH other ones, > Gianluca --=3D20 Nathana=3DC3=3DABl Blanchet Supervision r=3DC3=3DA9seau P=3DC3=3DB4le Infrastrutures Informatiques 227 avenue Professeur-Jean-Louis-Viala 34193 MONTPELLIER CEDEX 5 =3D09 T=3DC3=3DA9l. 33 (0)4 67 54 84 55 Fax 33 (0)4 67 54 84 14 blanchet(a)abes.fr --------------DF760123B34BA11C0A26BA44 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: quoted-printable

Le 09/03/2017 =3DC3=3DA0 10:25, Gianlu= ca C=3D ecchi a =3DC3=3DA9crit=3DC2=3DA0:

On Wed, Mar 8, 2017 at 6:05 PM, Gianluca Cecchi <gianluca.cecchi(a)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 =3DC2=3DA08 17:38:57 T-ORACLE73 chronyd[616]: = Sy=3D stem clock wrong by 19.077230 seconds, adjustment started

Is this expected?

Possibly the default changed at some point in time, so that now it saves memory and so this implies pause of VM

Saving memory is essential in some ap=3DC3=3DA0plications like DB, so y= ou won't bypass vm pauses for such a stuff

In the mean time I verified changing backup.py this way solves the problem (the 3.6 api deprecation still in place... ;-):

$ diff backup.py backup.py.orig=3DC2= =3DA0=3D

123c123

< =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA= 0 =3DC2=3DA0 =3DC2=3D =3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 vm.snapshots.add(params.Snapshot(description=3D3Dconfig.get_snapshot_descri= =3D ption(), vm=3D3Dvm,persist_memorystate=3D3DFalse))

---

> =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA= 0 =3DC2=3DA0 =3DC2=3D =3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 vm.snapshots.add(params.Snapshot(description=3D3Dconfig.get_snapshot_descri= =3D ption(), vm=3D3Dvm))

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=3DC2= =3DA0=3D

123c123

< =3DC2=3DA0 =3DC2=3DA0 =3DC2= =3DA0 =3DC2=3DA0 =3DC2=3D =3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 vm.snapshots.add(params.Snapshot(description=3D3Dconfig.get_snapshot_descri= =3D ption(), vm=3D3Dvm,persist_memorystate=3D3Dconfig.get_persist_memorystate()))

---

> =3DC2=3DA0 =3DC2=3DA0 =3DC2= =3DA0 =3DC2=3DA0 =3DC2=3D =3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 vm.snapshots.add(params.Snapshot(description=3D3Dconfig.get_snapshot_descri= =3D ption(), vm=3D3Dvm))

2)

$ diff config.py config.py.orig=3DC2=3DA0

34d33

< =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2= =3DA0 =3DC2=3DA0 self.__=3D persist_memorystate =3D3D config_parser.getboolean(section, "persist_memorystate")<= =3D /div>
113,116d111

<=3DC2=3DA0

<=3DC2=3DA0

< =3DC2=3DA0 =3DC2=3DA0 def get_persist_memorystate(s= elf):<=3D /div>
< =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 =3DC2=3DA0 return = self.__persist=3D _memorystate

And in config file called add:

# Save Memory in snapshot

persist_memorystate=3D3DFalse

It could be further improved if one wants to differentiate save memory for some VMs and not for other ones....

HIH other ones,

Gianluca

--=3D20
Nathana=3DC3=3DABl Blanchet

Supervision r=3DC3=3DA9seau
P=3DC3=3DB4le Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5 =3D09
T=3DC3=3DA9l. 33 (0)4 67 54 84 55
Fax  33 (0)4 67 54 84 14
bl=3D
anchet(a)abes.fr

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