install without LVM

is it possible to work with Proxmox without LVM?

because im currently having issues when trying to use lvm with custom raid, i have this installation on my server.

root@server:~# df -h
Filesystem Size Used Avail Use% Mounted on
udev 10M 0 10M 0% /dev
tmpfs 3.2G 348K 3.2G 1% /run
/dev/md2 20G 1.1G 18G 6% /
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 7.1G 3.1M 7.1G 1% /run/shm
/dev/md4 3.6T 197M 3.4T 1% /var/lib/vz
/dev/fuse 30M 12K 30M 1% /etc/pve

this is only soft raid, md2 is raid1 and md4 is raid0

basically i want to know if i can use it this way or LVM is absolutely necessary.

Regards.