[Qemu-devel] Disk geometry

[Qemu-devel] Disk geometry

[Girish V]

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Hello,

I am trying to use a disk image which I created using qemu for Bochs. I am
having some issues in figuring out the geometry of the disk. Bochs requires
that I specify
a) the number of cylinders
b) the number of heads
c) the number of tracks

When I do fdisk -lu fc5_3.0.2.img I get
------------------------------------------------------------------------------------------------
last_lba(): I don't know how to handle files with mode 81a4
You must set cylinders.
You can do this from the extra functions menu.

Disk fc5_3.0.2.img: 0 MB, 0 bytes
255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
Units = sectors of 1 * 512 = 512 bytes


        Device Boot      Start         End      Blocks   Id  System
fc5_3.0.2.img1   *          63    10490444     5245191   83  Linux
fc5_3.0.2.img2        10490445    12578894     1044225   82  Linux swap /
Solaris
------------------------------------------------------------------------------------------------

When I boot up the disk using qemu and do fdisk -lu /dev/hda from *inside
qemu*, I get
------------------------------------------------------------------------------------------------
Disk /dev/hda: 6442 MB, 6442450944 bytes
255 heads, 63 sectors/track, 783 cylinders, total 12582912 sectors
Units = sectors of 1 * 512 = 512 bytes


        Device Boot      Start             End       Blocks   Id     System
/dev/hda1     *               63    10490444     5245191   83     Linux
/dev/hda2           10490445    12578894    1044225    82     Linux swap /
Solaris
------------------------------------------------------------------------------------------------


I tried using the geometry as seen inside qemu (783/255/63) in bochs but
bochs fails with the message
[HD   ] ata0-0 disk size doesn't match specified geometry


Any ideas how I can use this disk. The only other option is to create a disk
using bochs from scratch - which I would like to avoid.

Any help is appreciated.

Girish

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Re: [Qemu-devel] Disk geometry

[C.W. Betts]

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On Thursday 17 April 2008 08:55:17 am Girish V wrote:
> Hello,
>
> I am trying to use a disk image which I created using qemu for Bochs. I am
> having some issues in figuring out the geometry of the disk. Bochs requires
> that I specify
> a) the number of cylinders
> b) the number of heads
> c) the number of tracks
>
> When I do fdisk -lu fc5_3.0.2.img I get
> ---------------------------------------------------------------------------
>--------------------- last_lba(): I don't know how to handle files with mode
> 81a4
> You must set cylinders.
> You can do this from the extra functions menu.
>
> Disk fc5_3.0.2.img: 0 MB, 0 bytes
> 255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
> Units = sectors of 1 * 512 = 512 bytes
>
>
>         Device Boot      Start         End      Blocks   Id  System
> fc5_3.0.2.img1   *          63    10490444     5245191   83  Linux
> fc5_3.0.2.img2        10490445    12578894     1044225   82  Linux swap /
> Solaris
> ---------------------------------------------------------------------------
>---------------------
>
> When I boot up the disk using qemu and do fdisk -lu /dev/hda from *inside
> qemu*, I get
> ---------------------------------------------------------------------------
>--------------------- Disk /dev/hda: 6442 MB, 6442450944 bytes
> 255 heads, 63 sectors/track, 783 cylinders, total 12582912 sectors
> Units = sectors of 1 * 512 = 512 bytes
>
>
>         Device Boot      Start             End       Blocks   Id     System
> /dev/hda1     *               63    10490444     5245191   83     Linux
> /dev/hda2           10490445    12578894    1044225    82     Linux swap /
> Solaris
> ---------------------------------------------------------------------------
>---------------------
>
>
> I tried using the geometry as seen inside qemu (783/255/63) in bochs but
> bochs fails with the message
> [HD   ] ata0-0 disk size doesn't match specified geometry
>
>
> Any ideas how I can use this disk. The only other option is to create a
> disk using bochs from scratch - which I would like to avoid.
>
> Any help is appreciated.
>
> Girish

I think, in order for Bochs to use it, the disk image either needs to be in RAW or bochs format.  You can covert it using qemu-img.  
You can also find out the format by doing 'qemu-img info' then the path to the disk image.

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Re: [Qemu-devel] Disk geometry

[Girish V]

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Sorry - I should have mentioned that my disc image is indeed in raw format.
Girish


On Thu, Apr 17, 2008 at 12:42 PM, C.W. Betts <computers57@hotmail.com>
wrote:

> On Thursday 17 April 2008 08:55:17 am Girish V wrote:
> > Hello,
> >
> > I am trying to use a disk image which I created using qemu for Bochs. I
> am
> > having some issues in figuring out the geometry of the disk. Bochs
> requires
> > that I specify
> > a) the number of cylinders
> > b) the number of heads
> > c) the number of tracks
> >
> > When I do fdisk -lu fc5_3.0.2.img I get
> >
> ---------------------------------------------------------------------------
> >--------------------- last_lba(): I don't know how to handle files with
> mode
> > 81a4
> > You must set cylinders.
> > You can do this from the extra functions menu.
> >
> > Disk fc5_3.0.2.img: 0 MB, 0 bytes
> > 255 heads, 63 sectors/track, 0 cylinders, total 0 sectors
> > Units = sectors of 1 * 512 = 512 bytes
> >
> >
> >         Device Boot      Start         End      Blocks   Id  System
> > fc5_3.0.2.img1   *          63    10490444     5245191   83  Linux
> > fc5_3.0.2.img2        10490445    12578894     1044225   82  Linux swap
> /
> > Solaris
> >
> ---------------------------------------------------------------------------
> >---------------------
> >
> > When I boot up the disk using qemu and do fdisk -lu /dev/hda from
> *inside
> > qemu*, I get
> >
> ---------------------------------------------------------------------------
> >--------------------- Disk /dev/hda: 6442 MB, 6442450944 bytes
> > 255 heads, 63 sectors/track, 783 cylinders, total 12582912 sectors
> > Units = sectors of 1 * 512 = 512 bytes
> >
> >
> >         Device Boot      Start             End       Blocks   Id
> System
> > /dev/hda1     *               63    10490444     5245191   83     Linux
> > /dev/hda2           10490445    12578894    1044225    82     Linux swap
> /
> > Solaris
> >
> ---------------------------------------------------------------------------
> >---------------------
> >
> >
> > I tried using the geometry as seen inside qemu (783/255/63) in bochs but
> > bochs fails with the message
> > [HD   ] ata0-0 disk size doesn't match specified geometry
> >
> >
> > Any ideas how I can use this disk. The only other option is to create a
> > disk using bochs from scratch - which I would like to avoid.
> >
> > Any help is appreciated.
> >
> > Girish
>
> I think, in order for Bochs to use it, the disk image either needs to be
> in RAW or bochs format.  You can covert it using qemu-img.
> You can also find out the format by doing 'qemu-img info' then the path to
> the disk image.
>

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