Re: [Xen-devel] incorrect disk numbering with qemu

[Olaf Hering <olaf@xxxxxxxxx>]

On Thu, Jan 16, Ian Campbell wrote:

> Not quite. Each xvd[a-d] creates both a PV and an emulated IDE device
> hd[a-d], which refer to the same underlying volume.
> 
> This allows you to boot from hda, do an unplug and then switch to using
> xvda.

Not really: In the end hda is connected to the emulated IDE, so today
its really "sda" in domU because pata_piix will drive it. sda was
connected to emulated LSI SCSI. But xvda was not connected to any
emulated controller, its PV only. Thats how it is done with qemu-trad.
So having hda and xvda in the same config was working, and maybe even
supported?

With qemu-upstream this appearently changed. I'm not saying this change
in behaviour is good or bad, just that something changed. Some people
still use the kernel names instead of UUID or LABEL. So they have to
adjust their config in domU and also in domU.cfg before they switch from
qemu-trad to qemu-upstream.


Olaf

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