Re: [Xen-users] propagating blktap partition changes

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Feb 05, 2009 at 01:59:57PM +0100, Maarten Vanraes wrote:
> Op Thursday 05 February 2009 13:05:01 schreef Pasi Kärkkäinen:
> > On Thu, Feb 05, 2009 at 11:52:56AM +0100, Maarten Vanraes wrote:
> > > Hi,
> > >
> > > I have 2 questions:
> > >
> > >  1. I was not able to let the guest know that the partition size was
> > > changed. 2. I was not able to use block-attach with the same backendfile
> > > to different machines (eg: guest + dom0)
> > >
> > > I've read that block-reconfigure could've been used for this, except that
> > > it wasn't designed to work for filebased vbd on PVs, only for switching
> > > CDROMs in HVM
> > >
> > > When you use a local disk on a machine, you can use fdisk to change
> > > partitions and sizes, it then rereads the partition table to reflect
> > > those changes.
> > >
> > > Since i'm not using a disk, but directly partitions, isn't it possible to
> > > just give a signal to the guest that it should recheck the partition? can
> > > be from the guest itself.
> > >
> > > Some kind of workaround?
> >
> > Sorry, this is not possible.
> >
> > There's a a feature request about it for Xen 3.4.
> >
> > Dunno if it will be implemented.
> >
> > -- Pasi
> 
> Yes, i read your thread, i was hoping for some kind of workaround, some kind 
> of "thing" i can execute on the guest, that would make the kernel recheck 
> it's partition size or something.
> 

The problem is not about rereading the partition table; this can be done
using for example "blockdev --rereadpt".

The problem is to get the disk device (/dev/xvd*) resized.. ie. getting the 
kernel to see
the DISK has been resized. 

After the disk has been resized, partition table can be resized after that. 

Disk resizing on the fly is not supported today with Xen.

-- Pasi

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users