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

[Stefan Hajnoczi <stefanha@gmail.com>]

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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.
> 
> [root@localhost ~]# 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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