On Mon, Apr 07, 2008 at 11:51:36AM -0700, Jayson Vantuyl wrote:
> Consider this to be my vote for block-reconfigure working. I suspect
> it wouldn't take much work actually.
>
> In retrospect, it's completely possible to concatenate devices at
> runtime using device mapper. It's the same thing that LVM does under
> the sheets. If you somehow got your root on a DM device (initrd
> maybe?), then you could live-modify it to add in another device you
> pass through. It's fraught with peril, but completely possible.
>
Please check this recent thread on xen-devel:
http://lists.xensource.com/archives/html/xen-devel/2008-09/msg00158.html
It seems block-reconfigure has never worked for online resizing xen domU xvd
disks..
It is now being looked at and considered for Xen 3.4 as a new feature.
-- Pasi
> On Apr 7, 2008, at 9:56 AM, Florian Heigl wrote:
>
> >2008/4/7, Jayson Vantuyl <jvantuyl@xxxxxxxxxxxxxx>:
> >>I think the developers have kind of let this one go.
> >>
> >>Once upon a time, in addition to block-detach and block-attach
> >>there was
> >>also block-configure. Block-configure supposedly told the inner
> >>DomU to
> >>refresh its idea of the block device. It stopped working a while
> >>back, a
> >>few people complained, it was never fixed.
> >>
> >>I haven't tested it, but this would be the "right way" to do
> >>it...if it
> >>worked.
> >
> >that was highly enlightening...
> >
> >block-reconfigure would have allowed to reliably resize storage
> >without shutting down domUs (yes, yes, with pvresize or other rescans
> >and of course a capable filesystem, but lets stick to the root issue).
> >I used to concatenate filesystem images using dd skip=xx but never
> >found a way to notify the domU of a successful change. add in the
> >fact, that large numbers of [ phy:... or, even worse file: ] disk
> >definitions tend to be unreliable and it would be REALLY great to get
> >the feature back.
> >
> >maybe we can start a little rally to make someone from -devel aware
> >this is a NEEDED feature?
> >
> >rgds,
> >florian
> >
> >--
> >'Sie brauchen sich um Ihre Zukunft keine Gedanken zu machen'
>
> --
> Jayson Vantuyl
> Systems Architect
> Engine Yard
> jvantuyl@xxxxxxxxxxxxxx
> 1 866 518 9275 ext 204
>
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