Re: [Qemu-devel] [PATCH] qcow2: add allocated-size to image specific info

[Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>]

18.05.2017 13:25, Kevin Wolf wrote:
> Am 18.05.2017 um 12:09 hat Vladimir Sementsov-Ogievskiy geschrieben:
>> Shows, how much data qcow2 allocates in underlying file. This should
>> be helpful on non-sparse file systems, when qemu-img info "disk size"
>> doesn't provide this information.
>>
>> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
>> ---
>> Hi all.
>>
>> Here is an allocated-size feature for qemu-img info.
> I'm not a fan of loading all L2 tables (can take some time) for
> 'qemu-img info' (which should be very quick). Why isn't the qemu-img
> check output good enough?
>
> Kevin
>
> $ ./qemu-img check /tmp/test.qcow2
> No errors were found on the image.
> 16164/491520 = 3.29% allocated, 11.98% fragmented, 0.00% compressed clusters
> Image end offset: 1060044800
> $ ./qemu-img check --output=json /tmp/test.qcow2
> {
>      "image-end-offset": 1060044800,
>      "total-clusters": 491520,
>      "check-errors": 0,
>      "allocated-clusters": 16164,
>      "filename": "/tmp/test.qcow2",
>      "format": "qcow2",
>      "fragmented-clusters": 1937
> }


It is not the same, it shows guest clusters, but we need host clusters - 
including all metadata, dirty bitmaps, snapshots, etc..



-- 
Best regards,
Vladimir