From Ernest.Beinrohr at axonpro.sk Tue May 12 07:56:39 2015 Content-Type: multipart/mixed; boundary="===============3295935992436136345==" MIME-Version: 1.0 From: Ernest Beinrohr To: users at ovirt.org Subject: [ovirt-users] ovirt-agent: is it possible to run specific actions when taking snapshots? Date: Tue, 12 May 2015 13:56:36 +0200 Message-ID: <5551EA74.4070205@axonpro.sk> --===============3295935992436136345== 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. --------------000401040808070400080406 Content-Type: text/plain; charset=3Dutf-8; format=3Dflowed Content-Transfer-Encoding: 7bit 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 , RHCE = , RHCVA = , LPIC = , VCA , +421-2-62410360 +421-903-482603 --------------000401040808070400080406 Content-Type: text/html; charset=3Dutf-8 Content-Transfer-Encoding: 7bit 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, RHCE, RHCVA, LPIC, VCA,
+421-2-62410360 +421-903-482603

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Date: Sun, 17 May 2015 10:53:59 +0300 Message-ID: <55584917.9080508@redhat.com> In-Reply-To: 5551EA74.4070205@axonpro.sk --===============4746844114151868861== 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. --------------060105060909030102090004 Content-Type: text/plain; charset=3Dwindows-1252; format=3Dflowed Content-Transfer-Encoding: 7bit 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 = > 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 , RHCE = > , RHCVA = > , LPIC = > , VCA , > +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 --------------060105060909030102090004 Content-Type: text/html; charset=3Dwindows-1252 Content-Transfer-Encoding: 7bit

We use libvirt VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag, =
which uses guest agent to quiesce all mounted file systems within the domai=
n.
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 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, RHCE, RHCVA<= /a>, LPIC, VCA,
+421-2-62410360 +421-903-482603

<= /div>
_______________________________________________
Users mailing list
Use=
rs(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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at ovirt.org Subject: Re: [ovirt-users] ovirt-agent: is it possible to run specific actions when taking snapshots? Date: Sun, 17 May 2015 19:05:03 +0000 Message-ID: <12EF8D94C6F8734FB2FF37B9FBEDD1735FCA004A@EXCHANGE.collogia.de> In-Reply-To: 55584917.9080508@redhat.com --===============5165398276267346974== Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable ------=3D_NextPartTM-000-2069c4dc-0b42-48fe-912e-04dd65c1098d Content-Type: multipart/alternative; boundary=3D"_000_12EF8D94C6F8734FB2FF37B9FBEDD1735FCA004AEXCHANGEcollogi_" --_000_12EF8D94C6F8734FB2FF37B9FBEDD1735FCA004AEXCHANGEcollogi_ Content-Type: text/plain; charset=3D"iso-8859-1" Content-Transfer-Encoding: quoted-printable >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=3D 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= =3D ons when taking snapshots? We use libvirt VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag, which uses guest ag= =3D ent to quiesce all mounted file systems within the domain. The qemu guest agent implements fsfreeze/fsthaw commands, which do the quie= =3D 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= =3D t-agent installed, ovirt could tell the agent to run site-speficic actions.= =3D 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, RHCE,= =3D RHCVA, LPIC, VCA, +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 --_000_12EF8D94C6F8734FB2FF37B9FBEDD1735FCA004AEXCHANGEcollogi_ Content-Type: text/html; charset=3D"iso-8859-1" Content-Transfer-Encoding: quoted-printable

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= -bounc=3D es(a)ovirt.org]" im Auftrag von "Yaniv Dary [ydary(a)redhat.com]<= br> Gesendet: Sonntag, 17. Mai 2015 09:53
An: Ernest Beinrohr; users
Betreff: Re: [ovirt-users] ovirt-agent: is it possible to run specif= =3D ic actions when taking snapshots?

We use libvirt VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE flag, which uses gue=
=3D
st agent to quiesce all mounted file systems within the domain.=3D0A=3D
The qemu guest agent implements fsfreeze/fsthaw commands, which do the quie=
=3D
scing.=3D0A=3D

On 05/12/2015 02:56 PM, Ernest Beinrohr wr= ot=3D e:

It would be nice, if ovirt snapshots were more = sa=3D fe. When a VM has the ovirt-agent installed, ovirt could tell the agent to = =3D 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, = =3D AXON PRO
Ing, RHCE, RHCVA, LPIC, VCA,
+421-2-62410360 +421-903-482603

=

_______________________________________________=3D0A=3D Users mailing list=3D0A=3D Users(a)ovirt.org=3D0A=3D http://lists.ovirt.org/mailman/listinfo/= us=3D ers=3D0A=3D

-- =3D0A=3D
Yaniv Dary=3D0A=3D
Technical Product Manager=3D0A=3D
Red Hat Israel Ltd.=3D0A=3D
34 Jerusalem Road=3D0A=3D
Building A, 4th floor=3D0A=3D
Ra'anana, Israel 4350109=3D0A=3D
=3D0A=3D
Tel : +972 (9) 7692306=3D0A=3D
      8272306=3D0A=3D
Email: ydary(a)redhat.com=3D0A=3D
IRC : ydary

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