Hi Allon,

I am trying to leverage snapshot capability of underlying fil= =3D esystem.

As per my understanding current snaps= ho=3D t works like this:

Base Image(raw)--->snap1(qcow)->snap2(qcow), i.e after each s= =3D napshot vm starts writing on newly created qcow image.

So in this case vm is going to do all new writes on snap2(qcow) voulme a= =3D nd will redirect read IOs to snap1 & Base image as required.

But in my case snapshots created by the filesystem are read only and it'= =3D s in raw format.

As a result after creating snapshot vm disk configuration won't change a= =3D fter taking snapshot but will continue doing writes on same base image.

So snapshots will look like this:

Base Image(raw)--->snap1(raw)->snap2(raw)

Base Image will always remain writable, while the s= =3D napshots will remain read only raw format.

Just wanted to confirm is this configurable so that vm continues r= =3D eferring base image after the snapshot instead of newly created qcow image?= =3D

Thanks & Regards,

Deepak

=
Not =3D
sure I understand the question. Could you give an example of what you =
=3D
mean perhpas?

On Tue, Jun 20, 2017 at 10:01 PM, Deepak Jagta= p =3D <deep= ak.jag=3D tap(a)maxta.com> wrote:

Hi Allon,

After going through current vdsm code base, noticed that after= =3D taking a snapshot vm starts referring the newly created qcow image/volume.= =3D

For internal snapshots which are not qcow is it configurable = =3D somehow so that vm continues doing writes to same base image?

Thanks & Regards,

Deepak

From:<= /b> =3D Deepak Jagtap
Sent: Tuesday, June 6, 2017 3:37:03 PM
To: Allon Mureinik
Cc: devel= (a)ovirt=3D .org
Subject: Re: [ovirt-devel] Snapshots & clone support from datast= =3D ore

Thanks Allon!

Best Regards,

Deepak

From:<= /b> =3D Allon Mureinik <amureini(a)redhat.com>
Sent: Tuesday, June 6, 2017 2:43:17 PM
To: Deepak Jagtap
Cc: devel= (a)ovirt=3D .org
Subject: Re: [ovirt-devel] Snapshots & clone support from datast= =3D ore

= Unfo=3D rtunately, there's no such integration point at the moment.

On Tue, Jun 6, 2017 at 5:57 AM, Deepak Jagtap = <deep= ak.jag=3D tap(a)maxta.com> wrote:

Hey Guys,

I am newbie to ovirt, and wanted to confirm whats the best way to levera= =3D ge snapshot, clone features

provided by the datastore filesystem.

I have a btrfs datastore exported and wanted use btrfs snapshots fo= =3D r vm snapshot & clones.

Does ovirt offers any hooks/APIs so that image snapshots are created by = =3D the filesystem?

Thanks & Regards,

Deepak

_______________________________________________
Devel mailing list
Devel(a)ovirt.or= g http://lists.ovirt.org/mailman/listinfo/devel<=3D br>