[PVE-User] qcow2 vs raw format

Laurent Dumont laurentfdumont at gmail.com
Mon Mar 9 14:26:18 CET 2020


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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