Re: [Qemu-discuss] [Qemu-devel] Estimation of qcow2 image size converted from raw image

[Eric Blake]

On 02/15/2017 09:20 AM, Daniel P. Berrange wrote:
>> Let's try this syntax:
>>
>>   $ qemu-img query-max-size -f raw -O qcow2 input.raw
>>   1234678000
>>
>> As John explained, it is only an estimate.  But it will be a
>> conservative maximum.
> 
> This forces you to have an input file. It would be nice to be able to
> get the same information by merely giving the desired capacity e.g
> 
>   $ qemu-img query-max-size -O qcow2 20G

We'd need an option to tell the difference between size and pre-existing
file, if we want to support both ways.  Maybe:

qemu-img query-max-size -O qcow2 --size 20G
qemu-img query-max-size -O qcow2 -f raw input.raw

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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