Re: [Xen-devel] Re: [PATCH] Fix restore handling checks

[Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>]

On Wed, 23 Jun 2010 13:29:56 +0200
Michal Novotny <minovotn@xxxxxxxxxx> wrote:

> On 06/23/2010 01:27 PM, Ian Jackson wrote:
> > Paolo Bonzini writes ("Re: [PATCH] Fix restore handling checks"):
> >    
> >> We tried to get that to work, and we could not really find a device
> >> error that worked reliably in the guests.  We often got infinite loops
> >> on mount or little after that, on both Linux and Windows.
> >>      
> > That's fine.  If the admins don't want that then they can use SCSI or
> > PV or simply not tell the guest to write to the device.
> >
> > Disallowing the configuration entirely just because the error handling
> > is suboptimal (but safe!) is not correct.
> >
> > Ian.
> >    
> 
> Why do you think so, Ian? This follows the IDE specifications to 
> disallow read-only IDE disks since the specs doesn't support IDE 
> read-only disks. The only read-only device being supported by IDE specs 
> is the CD-ROM device.

IDE (or more properly ATA) doesn't support CD-ROM either. ATAPI does, and
it also supports other ATAPI devices with write protect including magneto
optical and floppy.


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