[CentOS] Resizing a Xen DomU disk image

Alain Spineux aspineux at gmail.com
Wed Dec 19 18:48:53 UTC 2007


On Dec 19, 2007 7:26 PM, Matthew Lind <mlind at nhctc.edu> wrote:
> Hello Mailing List!
>
> A quick question.  Has anyone gotten a resize (in my case grown) a Xen
> DomU disk image?
>
> Here is the procedure I have followed:
>
> 1.  Install a DomU using virt-install
>         Customize xvda to be all one partition ext3
> 2.  On Dom0:
>         dd if=/dev/zero bs=1G count=1 >> <my_disk_image>
>         ll -h (Image is now 1GB larger)
>         xm create <DomU>
>     On DomU:
>         df -h (Size has not changed)
>         shutdown -h now
>     On Dom0:

e2fsck works only on device, but yuo can creat a loop device using losetup

someting like

losetup -f <my_disk_image>

now you can mount, e2fsck or resize /dev/loop0

>         e2fsck -f <my_disk_image> (Errors Bad Magic...)
>         resize2fs -f <my_disk_image> (Errors Bad Magic...)

then delete the loop device

losetup -d /dev/loop0

regards

>         xm create <DomU>
>     On DomU:
>         df -h (Still reports old size)
>
> I am assuming that because resize2fs didn't run that the DomU doesn't
> know about the additional space.
>
> Thanks in advance!
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-- 
Alain Spineux
aspineux gmail com
May the sources be with you



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