[Xen-users] how to expand disk inside of domU?

[Dan Waterloo <dan@xxxxxxx>]

i'm trying to find a way to expand a selected partition in my DomU...

when in a console in the domU, here are the disks available:

[root@localhost ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
                       13G  3.5G  8.1G  30% /
/dev/xvda1             99M   21M   74M  22% /boot
tmpfs                 257M     0  257M   0% /dev/shm

I'd like to expand the /dev/mapper/VolGroup00-LogVol00 disk to 25G

The domU is based on an image file, 'webs.img' that resides on a disk in the Dom0.
In the dom0, I add space to the webs.img file with the following command:

dd if=/dev/zero bs=1024k count=12288 >> webs.img

then, when i create the webs domu, i.e. xm create webs;
it starts, and the new space shows up as "unintialized' space  
in the domu. (I see this using vnc to reach the desktop, and 
open the LVM tool to see the new space). 

The problem that I'm having is to 'attach' the unintialized space in the 
domU to the /dev/mapper/VolGroup00-LogVol00 disk, and then to expand the 
LogVol00 disk to take advantage of the space.

I'm running Centos5 on the dom0, and in the domU. Xen is version 3.

Any suggestions? if so, can you please be explicit as to _where_ to run the various 
commands, in the Dom0 or DomU? At this point, I'm pretty confused about 
what to do where....

Thanks!

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