WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

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

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Online resize of guest disks without reboot/shutdown ?
From: "J. Roeleveld" <joost@xxxxxxxxxxxx>
Date: Wed, 14 Apr 2010 09:01:06 +0200
Delivery-date: Wed, 14 Apr 2010 00:02:32 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <4BC42B00020000990004EE33@xxxxxxxxxxxxxxxxxxxxx>
List-help: <mailto:xen-users-request@lists.xensource.com?subject=help>
List-id: Xen user discussion <xen-users.lists.xensource.com>
List-post: <mailto:xen-users@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-users>, <mailto:xen-users-request@lists.xensource.com?subject=unsubscribe>
References: <4BC42B00020000990004EE33@xxxxxxxxxxxxxxxxxxxxx>
Sender: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: KMail/1.12.4 (Linux/2.6.30-gentoo-r5; KDE/4.3.5; x86_64; ; )
On Tuesday 13 April 2010 16:27:44 Nick Couchman wrote:
> 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.

The patches for the Linux Kernel have been included in the latest Suse patch-
set.
One thing with these is, though, that the new size isn't noticed by the guest 
untill you actually access the disk.
A "ls" on the mount is sufficient for this.

> 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.

I doubt MS Windows will notice this change as it requires Driver-support in 
the guest-OS for this to work.

--
Joost

> 
> >>> 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
> 
> --------
> This e-mail may contain confidential and privileged material for the sole
>  use of the intended recipient.  If this email is not intended for you, or
>  you are not responsible for the delivery of this message to the intended
>  recipient, please note that this message may contain SEAKR Engineering
>  (SEAKR) Privileged/Proprietary Information.  In such a case, you are
>  strictly prohibited from downloading, photocopying, distributing or
>  otherwise using this message, its contents or attachments in any way.  If
>  you have received this message in error, please notify us immediately by
>  replying to this e-mail and delete the message from your mailbox. 
>  Information contained in this message that does not relate to the business
>  of SEAKR is neither endorsed by nor attributable to SEAKR.
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
> 

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