[PVE-User] qcow2 vs raw format

Laurent Dumont laurentfdumont at gmail.com
Mon Mar 9 14:37:37 CET 2020


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
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> <#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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