Re: [Xen-devel][PATCH]: Support dynamic resizing of vbds

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sun, Mar 14, 2010 at 01:49:38PM +0000, Andrew Lyon wrote:
> On Fri, Mar 12, 2010 at 10:41 AM, J. Roeleveld <joost@xxxxxxxxxxxx> wrote:
> > On Tuesday 09 March 2010 20:56:11 Ky Srinivasan wrote:
> >> The attached patch supports dynamic resizing of vbds.
> >>
> >> Signed-off-by: K. Y. Srinivasan <ksrinivasan@xxxxxxxxxx>
> >>
> >
> > Thank you for this.
> >
> > The patch applied succesfully against the gentoo-xen kernel (2.6.29-xen-r4)
> >
> > I will test the patch on my system during the next week and provide 
> > feedback.
> >
> > --
> > Joost Roeleveld
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-devel
> >
> 
> I tested the patch on xen-sources-2.6.31-r12 and it appears to work perfectly:
> 
> dom0: VBD Resize: new size 172032
> domU: Setting capacity to 172032
>

Btw it would be good to add the vbd-device and domU name to these log entries 
in the dom0,
and the device name in domU!
 
> I extended the filesystem and filled up the available space, then
> extended again:
> 
> dom0: VBD Resize: new size 376832
> domU: Setting capacity to 376832
> 
> fsck, badblocks, and testing a tarball I had filled the filesystem
> with revealed no problems, so I decided to try reducing the
> filesystem, first using resize2fs, then reducing the size of the block
> device, although some errors were logged in domU the operation seemed
> to work ok:
> 
> dom0: VBD Resize: new size 114688
> domU: Setting capacity to 114688
> domU: end_request: I/O error, dev sdb1, sector 212984
> domU: Buffer I/O error on device sdb1, logical block 26623
> 
> I did notice that it seemed to be necessary to "poke" the device using
> cfdisk /dev/sdb1 before domU would notice the new size, but on the
> whole everything works nicely and this is a very useful new feature!
> 

Good to hear it works!

-- Pasi


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