Re: [Xen-users] Share of disks in read only between dom0 and domU.

[Michel Gaudet <Michel.Gaudet@xxxxxxxx>]

Hello !

James Harper a écrit :
> > Hello !
> >
> > Because of a special config of my grub boot system, i try to export in
> a
> > domU, in read
> > only mode, one of my disk partition mounted in the dom0 (in RW)  and i
> > don't succeed
> > because xen refuse to export this disk partition in a domU.
> I think you can append a '!' do the permissions, eg 'r!' or 'w!' (or
> maybe it was a '+'?) if you want to force xen to do your bidding, even
> if xen thinks it's not a good idea. I've done this with OCFS2 before.
I tried this before but neither ! nor + works on my xen (3.0.3 in SuSE 10.2).
I get :
Error: Invalid mode


> But for a non-cluster aware filesystem, you're asking for trouble. DomU
> will cache filesystem data which Dom0 may write to, leaving DomU with
> out of data information (nothing to tell it to re-read). If everyone
> mounts the filesystem ro then you should be fine
>
> I think you can configure Dom0 to mount the filesystem with no write
> caching (eg synchronous mode), but I don't think you can tell DomU to
> mount it with no read caching, and even if you could, you would surely
> run into race conditions where Dom0 is changing data even as DomU is
> reading it.
>
> James
It is only for grub to see its differents stages (1.5 and 2) which are located on 
/dev/sda6 and it is no need at all to access this disk after booting the XP.
I don't know really if my idea is good but all the others tries did not work.

Thanks.

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