Re: [Xen-users] Resizing DomUs

[John Haxby <john.haxby@xxxxxxxxxx>]

Harold A. Giménez Ch. wrote:
> Thanks Rainer, that makes sense.
> How would I go about resizing the LVM? The PV you mention is simply 
> the /boot partition, and the LVM in there is where / is mounted. The 
> objective would be to expand the LVM. How would I go about that?
There are several ways to do this but they all amount to the same in the 
end.  If you use fdisk on the file you can delete the second partition 
and add it with the same start point and the default end point so that 
the partition now fills the disk.
Generally speaking it's now easiest to do the remainder of the resizing 
in the guest.   First, run "pvresize /dev/xvda2" (or whatever device the 
disk is mapped to).  This should grow the volume group to which this 
belongs and you can now do "vgdisplay /dev/VolGroup00" (or whatever the 
volume group is called) and you'll see you have some free physical 
extents.   Now you can increase the size of the logical volume you want 
to grow with "lvextend -L +<n> /dev/VolGroup00/LogVol01" where "<n>" is 
the number of extents you want to grow it by and which is no more than 
the number of free extents reported by vgdisplay.   And now, finally, 
you can grow the file system: "resize2fs /dev/VolGroup00/LogVol01".
That's all assuming you have a Red Hat/Fedora style DomU and it's 
reasonably new.  If it's different or it's older some things will be 
different: the main thing is that resize2fs used to be ext2online and 
took the mount point as parameter.
There are manual pages for all the commands I mentioned and it's worth 
reading them.  And backing stuff up, just in case.
jch


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