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
LVM Volumes
vg1 root 2G (/dev/vg1/root) vg1 swap 512M (/dev/vg1/swap)
Filesystems and Mountpoints
/dev/vg1/root / (btrfs) /dev/md0 /boot (btrfs) /dev/vg1/swap (swap)
lvm-root 2G btrfs lvm-swap swappartition