Ok, I think this will do it for you.   You grew the partition on your host disk and extended the /dev/md2 array that sits on top of that. We still need to tell lvm that its "physical" device (/dev/md2) has changed. We need to extend the logical volume and we need to resize the filesystem. The good news is that all this can be done without shutting down services.   Right now a vgdisplay will show all the space available to the volume group is completely use