Linux Disk Expand
Linux Disk Expand is a script that will automatically expand the root drive to use all available disk space.
Info
It was created for Debian 8 Jessie, installed from minimal CD with LVM and no disk encryption
It assumes the default ext4 fs and /dev/xvda device which is what XEN VMs have by default
Caution
This script asks no questions!!!
Please review the script source code and check that everything is as it should be!
Make sure that your LVM partition resides on /dev/xvda5 and that your root volume group has the default hostname--vg-root name
If you use xfs then you must comment the ext4 resize line and uncomment the xfs resize line (this has not been tested!)
If above assumptions are inaccurate then change the script to reflect your environment or do not use it!
The user is responsible for the results of using this script!
Usage
AFTER reading the Caution paragraph and making sure that all is OK just "chmod +x expand.sh" and execute it as root user.
A reboot is not required but is recommended
References
http://www.linuxbrigade.com/easily-increase-storage-size-with-lvm/
http://www.debianadmin.com/howto-make-partition-changes-visible-to-the-kernel-without-reboot.html