[PVE-User] qcow2 vs raw format

Leandro Roggerone leandro at tecnetmza.com.ar
Mon Mar 9 15:37:09 CET 2020


Can not do snapshots ? but can do bakups ?  is it necessary to turn off VM ?
Regads.

El lun., 9 mar. 2020 a las 10:39, Laurent Dumont (<laurentfdumont at gmail.com>)
escribió:

> I'm not sure if this still stands but you cannot do snapshots on a raw
> format, only qcow2.
>
> On Mon, Mar 9, 2020, 9:35 AM Leandro Roggerone <leandro at tecnetmza.com.ar>
> wrote:
>
> > Is there any reason to use qcow2 format ?
> > Im asking because I received qcow2 disk from an old system and need to
> > upload into my new pve.
> > I just want to know why people used this, my system currently does not
> > support it.
> > Leandro.
> >
> > <
> >
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail
> > >
> > Libre
> > de virus. www.avast.com
> > <
> >
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail
> > >
> > <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
> >
> > El lun., 9 mar. 2020 a las 10:27, Laurent Dumont (<
> > laurentfdumont at gmail.com>)
> > escribió:
> >
> > > This server fault post was written in 2012. I will do some test in the
> > lab
> > > but those results seem really really low for a modern system with
> modern
> > > packages.
> > >
> > > On Mon, Mar 9, 2020, 9:21 AM Roland @web.de <devzero at web.de> wrote:
> > >
> > > >  >Performance-wise, they should be almost the same. qcow2 is a bit
> more
> > > > complex than a raw file/partition, but I don't think you'll notice
> any
> > > > impact.
> > > >
> > > > i did test that a while ago and got very different results, qcow2 was
> > > > much slower on my system. cannot provide details, though (did not
> save
> > > > that)
> > > >
> > > > i recommend reading
> > > >
> > > >
> > >
> >
> https://serverfault.com/questions/407842/incredibly-low-kvm-disk-performance-qcow2-disk-files-virtio
> > > > and compare yourself....
> > > >
> > > > roland
> > > >
> > > > Am 09.03.20 um 13:35 schrieb Eneko Lacunza:
> > > > > Hola Leandro,
> > > > >
> > > > > El 9/3/20 a las 13:21, Leandro Roggerone escribió:
> > > > >> Thankyou Eneko ,
> > > > >> Are features / performance difference between those formats ?
> > > > >
> > > > > Take a look at:
> > > > > https://pve.proxmox.com/wiki/Storage
> > > > >
> > > > > Performance-wise, they should be almost the same. qcow2 is a bit
> more
> > > > > complex than a raw file/partition, but I don't think you'll notice
> > any
> > > > > impact. Maybe others can comment on this.
> > > > >
> > > > > Saludos
> > > > > Eneko
> > > > >
> > > > >> Regards,
> > > > >> Leandro.
> > > > >>
> > > > >> <
> > > >
> > >
> >
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail
> > > > >
> > > > >>
> > > > >> Libre
> > > > >> de virus. www.avast.com
> > > > >> <
> > > >
> > >
> >
> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail
> > > > >
> > > > >>
> > > > >> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
> > > > >>
> > > > >> El lun., 9 mar. 2020 a las 9:17, Eneko Lacunza (<
> elacunza at binovo.es
> > >)
> > > > >> escribió:
> > > > >>
> > > > >>> Hola Leandro,
> > > > >>>
> > > > >>> El 9/3/20 a las 13:11, Leandro Roggerone escribió:
> > > > >>>> Hi guys, after install pve , would like to create my first VM.
> > > > >>>> I noticed that only available format is raw.
> > > > >>>> Question is:
> > > > >>>> Is qcow2 deprecated ?
> > > > >>>> What are differences between them ? (I already google it but is
> > not
> > > > >>>> 100%
> > > > >>>> clear).
> > > > >>>>
> > > > >>>> This is my storage configuration is.
> > > > >>>> root at pve:~# cat /etc/pve/storage.cfg
> > > > >>>> dir: local
> > > > >>>>           path /var/lib/vz
> > > > >>>>           content iso,vztmpl,backup
> > > > >>>>
> > > > >>>> lvmthin: local-lvm
> > > > >>>>           thinpool data
> > > > >>>>           vgname pve
> > > > >>>>           content rootdir,images
> > > > >>>>
> > > > >>> You need a file-type storage (i.e. dir type) to be able to use
> > qcow2
> > > > >>> format. Default local-lvm is lvmthin and only logical volumes in
> > raw
> > > > >>> format can be created (no raw files are created in fact).
> > > > >>>
> > > > >>> Cheers
> > > > >>> Eneko
> > > > >>>
> > > > >>> --
> > > > >>> Zuzendari Teknikoa / Director Técnico
> > > > >>> Binovo IT Human Project, S.L.
> > > > >>> Telf. 943569206
> > > > >>> Astigarragako bidea 2, 2º izq. oficina 11; 20180 Oiartzun
> > (Gipuzkoa)
> > > > >>> www.binovo.es
> > > > >>>
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> >
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