Re: [Xen-users] Online resize of guest disks without reboot/shutdown ?

["Nick Couchman" <Nick.Couchman@xxxxxxxxx>]

Unfortunately functionality like this requires end-to-end supports for this 
change.  Not only do you need to be able to extend the backend device 
(lvextend, like you did), you need Xen to see it (probably the feature you 
mentioned), you need the guest kernel to see it, and you need the filesystem to 
be able to expand.  Getting the guest kernel to see the change has always been 
the tricky piece, as the kernel usually locks this information in and you have 
to reboot for it to reread the information.  However, I saw some patches 
recently for the Linux kernel that allow for on-the-fly resizing of disks, and 
I think I actually tried it with some amount of success.  I wish I still had 
the links - I would point you in the direction of them.

Other guest operating systems will vary on whether they support this or not.  
Windows is usually pretty good about detecting size changes for disks and 
allowing you to expand the filesystem.  Other O/Ss will vary.

-Nick

>>> On 2010/04/12 at 21:39, Chao-Rui Chang <ppc52776@xxxxxxxxx> wrote: 
> Hello all,
> 
> I just notice the new feature in the latest version 4 release.
> 
> Any one know how to do this ?
> 
> I have tried lvextend the partition size in dom0,
> but domU doesn't see the change.
> I also need to reboot to make domU reread the block size.
> 
> Any idea?
> 
> Best regards,
> Chao-Rui




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