Under the Proxmox GUI:
1. Click on the NS7-VM > Hardware > Hard Disk (xxx) > Resize disk > 1500
On the NS7 Console:
2. fdisk /dev/sda > p > d > 2 > n > p > 2 > First sector <Enter> > Last sector <Enter> w
3. reboot the server If you get this:
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
4. pvresize /dev/sda2
5. lvresize -l +100%FREE /dev/VolGroup/lv_root
6. xfs_growfs /dev/VolGroup/lv_root