Re: [Qemu-devel] [Important] Query regarding bdrv_co_discard

[Stefan Hajnoczi]

On Thu, Sep 04, 2014 at 05:56:53AM -0700, Sanjay Kumar2 wrote:
> Output of hdparam is below. Also let me know does network based protocol 
> supports 'qcow2' format. As my block driver is network based. It is perfectly 
> working for raw format. When I change the type='qcow2', then it is not 
> working because bdrv_get_geometry() is returning 0. This I am talking about 
> qemu-kvm-0.12.1.2.
> 
> address@hidden ~]# hdparm -I /dev/sda
> 
> /dev/sda:
> SG_IO: bad/missing sense data, sb[]:  70 00 05 00 00 00 00 0a 00 00 00 00 20 
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 
> ATA device, with non-removable media
> Standards:
>         Likely used: 1
> Configuration:
>         Logical         max     current
>         cylinders       0       0
>         heads           0       0
>         sectors/track   0       0
>         --
>         Logical/Physical Sector size:           512 bytes
>         device size with M = 1024*1024:           0 MBytes
>         device size with M = 1000*1000:           0 MBytes
>         cache/buffer size  = unknown

I guess you are asking why hdparm reports 0 MB size?

Please post the qemu command-line (ps aux | grep qemu) so we know how
the guest is configured.

qcow2 works on non-file protocols (e.g. network).

Please keep discussion in this email thread and don't post comments
about this on my blog.

Stefan

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