Re: [Xen-users] resizing filesystem in a VM

["Fajar A. Nugraha" <list@xxxxxxxxx>]

On Thu, Aug 11, 2011 at 4:40 PM, Alexandre Chapellon
<a.chapellon@xxxxxxxxx> wrote:
>
> Hello,
>
> I am using Xen 4.0.1 and Xen 3.2.1 dom0 with Debian Lenny and Squeeze dom0s.
> I have a bunch of virtual machines running , all using LVM as backend storage.
> Mostly, an LVM logical volume is mapped to a partition in the VM (eg: xvda1)
> I have tried to hot resize the filesystem in the VM without umounting it but 
> it just do not work... Here is what I did:
>
>  - lvextend on the dom0,
>  - resize2fs on the VM
>
> Doing so, the kernel of the virtual machine seems not to see the space 
> available for the partition has changed and resize2fs returns: "xvda already 
> has xxxxxxxxx blocks, Nothing to do"
>
> This last until I hot remove the disk from the VM using xm block-detach and 
> re-attach it using xm block attach.
> After re-attaching  the disk I can resize2fs as expected.
>

That is expected behaviour.

>
> Is there anything I can do to avoid detaching the block device from the VM to 
> let the kernel know the partition has a new size?
> What are the bests practices in Xen to achieve hot resize of filesystem in 
> the VM?

Newer version of xen and domU kernel allows domU to detect block
device change without having to detach/reboot. Try using domU kernel
form Jeremy's git tree.

-- 
Fajar

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