Re: [Xen-users] xvda1, xvda2 disk configuration with hvm

[James Dingwall <james-xen@xxxxxxxxxxxxxx>]

On Thu, Mar 08, 2018 at 10:59:35AM +1300, Juan Rossi wrote:
> We are converting some VMs from pv into hvm, we used to map the disks in 
> the configuration file as follows:
> 
> disk = [ 'phy:/dev/users/debian.img,xvda1,w', 
> 'phy:/dev/users/debian.swapfs.swp,xvda9,w' ]
> 
> so we are basically mapping block devices that have no partition tables, 
> just file systems to xvdaX style devices.
> 
> When moving into type=hvm we hit issues with this, if I am correct it is 
> due qemu-dm and the need to have partition tables, mapping to raw disks 
> and devices have the need to be in different denomination letter, eg 
> /dev/users/debian.img,xvda1 /dev/users/debian.swapfs.swp,xvdb1.
> 
> Is there a work around or setting we may be missing that will allows us 
> to map FSs in the form of xvdaX using hvm?

How important is the numeric X?  If you are happy to do without it you
could:

disk = [ 'phy:/dev/users/debian.img,xvda,w',
         'phy:/dev/users/debian.swapfs.swp,xvdb,w' ]

And just update /etc/fstab to use the whole block device instead of the
'partition'.  I think you should still be able to install a boot loader
on xvda but if not you could add a small extra disk just for the boot
loader and use xvdb and xvdc.

James

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