Re: [Xen-users] forcing disk in read only also if mounted

["Ulrich Windl" <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>]

On 15 Jan 2007 at 19:00, Daniele Palumbo wrote:

> On Monday 15 January 2007 19:02, you wrote:
> > This seems to indicate that the device
> > "/dev/Xen2Volume/domU-kernel-needed" is mounted read-write in dom0.  You
> > need to unmount it or mount it read-only in dom0 to use it in a guest.
> 
> well, if you read my first post, you'll see that setup is working right now 
> with /dev/Xen2Volume/domU-kernel-needed mounted in ro.
> 
> i want it in ro within domU and rw in dom0.
> the reasons are explained in my first post...

If you think, you'll realize:
DomU has it's own cache (even for R/O devices) with it's impression what the 
contents of the blocks are. Dom0 also has a cache for the R/W device. Both 
caches 
do not sync (in a coherent way). Thus DomU may see filesystem inconsistencies 
at 
runtime.

Why not use NFS to export in Dom0 R/O and also mount in DomU R/O?
Regards,
Ulrich

> 
> bye
> d.
> 
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