Mailing List Archive: Question on virtual block device

Hello All,

I am connecting my front and back for a block device.
I have collected from xenstore sectors, sector-size. But I also need:
u16 heads; // # heads
u16 cylinders; // # cylinders
u16 spt; // # sectors / track
I guess from the SeaBIOS perspective they are required, but from the
xen perspective how can I get them? pure math/translation?

Thanks,

Daniel

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| |   | Daniel Castro, |
| |   | Consultant/Programmer.|
| |   | U Andes    |
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On Thu, 2011-10-27 at 17:14 +0100, Daniel Castro wrote:
> Hello All,
>
> I am connecting my front and back for a block device.
> I have collected from xenstore sectors, sector-size. But I also need:
> u16 heads; // # heads
> u16 cylinders; // # cylinders
> u16 spt; // # sectors / track
> I guess from the SeaBIOS perspective they are required, but from the
> xen perspective how can I get them? pure math/translation?

CHS is rather historical and has no real relevance to a virtual device.
You can basically just make them up to fit the underlying device size,
take a look at blkif_getgeo in Linux for example.

Ian.

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