KVM Guest Disk Layout
The KVM Guests usually only runs one service. Many services does not require that much diskspace to run. Today filesystems can do online growing and shrinking, so the disksize can always be adjusted later on.
Hardware
One 4G virtual disk.
Partitions
vda 4G vda1 256M vda2 4G
LVM
vda2 lvm (vg_os)
LVM Volumes
vg_os root 2G (/dev/vg_os/root) vg_os swap 512M (/dev/vg_os/swap)
Filesystems and Mountpoints
/dev/vg_os/root / (btrfs) /dev/vda1 /boot (btrfs) /dev/vg_os/swap (swap)