[PVE-User] qcow2 vs raw format

Stefan Reiter s.reiter at proxmox.com
Mon Mar 9 15:43:32 CET 2020


On 3/9/20 3:37 PM, Leandro Roggerone wrote:
> Can not do snapshots ? but can do bakups ?  is it necessary to turn off VM ?
> Regads.

Backups in "snapshot" mode (i.e. without turning off the VM) are always 
possible, even on storages not supporting snapshots.

> 
> 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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>>>>
>>> Libre
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>>> <
>>>
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>>>>
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