On Sat, Jun 16, 2012 at 4:30 AM, Dennis Jacobfeuerborn < dennisml at conversis.de> wrote: > On 06/15/2012 09:10 PM, Jeff Boyce wrote: > > Greetings - > > > > I had a logical volume that was running out of space on a virtual > machine. > > I successfully expanded the LV using lvextend, and lvdisplay shows that > it > > has been expanded. Then I went to expand the filesystem to fill the new > > space (# resize2fs -p /dev/vde1) and I get the results that the > filesystem > > is already xx blocks long, nothing to do. If I do a # df -h, I can see > that > > the filesystem has not been extended. I could kick the users off the VM, > > reboot the VM using a GParted live CD and extend the filesystem that way, > > but I thought that it was possible to do this live and mounted? The RH > docs > > say this is possible; the man page for resize2fs also says it is possible > > with ext4. What am I missing here? This is a Centos 6.2 VM with an ext4 > > filesystem. The logical volumes are setup on the host system which is > also > > a Centos 6.2 system. > > You didn't really specify your topology accurately so I assume you used > lvextend on the host side. This will not be visible until you rebooted the > guest. > > The only way to resize without taking the system offline is to use lvm in > the guest. Add a new virtual disk on the host side which results in a > hot-plug event in the guest (i.e. you should see the new drive added in the > guest). Now create a single partition on the drive (this is important!) and > use pvcreate to turn it into a physical volume. Now add the new PV to the > Volume Group. Finally you can lvextend the LV in the guest and resize the > filesystem. > > The partitioning of the new disk in the guest is important because if you > use the disk directly as a PV then this PV will also be shown on the host. > An alternative is to modify the LVM filters in /etc/lvm/lvm.conf on the > host to specifically not scan the LV for the new disk. > I find it easier to create a partition though (i.e. use /dev/vda1 instead > of /dev/vda as the PV). > > Regards, > Dennis > > Not sure if this link would help, I used to refer to this now and then if I needed to extend an online partition --> http://www.randombugs.com/linux/howto-extend-lvm-partition-online.html