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Re: [Xen-devel] HVMAssist BIOS boot device problem

To: Stephen Quintero <stephen@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] HVMAssist BIOS boot device problem
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 08 Jul 2008 07:35:04 +0100
Cc: Apoorva Kulkarni <Apoorva@xxxxxxxxxx>, Minh Quach <minh@xxxxxxxxx>, Eric Tessler <eric@xxxxxxxxx>
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On 8/7/08 01:24, "Stephen Quintero" <stephen@xxxxxxxxx> wrote:

> Example A:  
> 
> I am building a Windows HVM appliance which performs file-system level
> operations over mounted NTFS volumes - for example a file-system level copy.
> 
> hda is the boot disk of the appliance and contains a single active (bootable)
> primary partition.  If hdb also contains a single active primary partition,
> sometimes the appliance boots from hda and properly mounts the hdb partition
> and sometimes it misfires and boots from the hdb partition, causing a disaster
> (the contents of hdb are unknown to the appliance prior to boot).
> 
> Example B:
> 
> Make three copies of a bootable Windows image and set them up as hda, hdb, and
> hdc.  "xm create" boots from the active partition of hda.  Shutdown and
> reorder the devices, switching the images for hda and hdc.  "xm create" now
> boots from the active partition of hdc.
> 
> Is there any method to cause an HVM guest to reliably boot from hda?

Is the selected disc deterministic for any particular config file, or does
it change randomly across reboots, with no changes to the guest config file?

 -- Keir



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