[PVE-User] qcow2 vs raw format

Leandro Roggerone leandro at tecnetmza.com.ar
Mon Mar 9 14:34:26 CET 2020


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.

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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.
> > >>
> > >> <
> >
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> > >
> > >>
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> > >> <
> >
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> > >>
> > >> <#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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