Good Afternoon Gede,
here is an extract from the UCS Manual, chapter 2.8. Partitioning the hard drive:
The Univention Installer supports the partitioning of hard drives and the creation of different file systems (e.g., ext4 and XFS In addition, it is also possible to set up mechanisms such as the logical volume manager (LVM), RAID or partitions encrypted with LUKS.
It is just the same as installing Debian or Ubuntu, as UCS is debian based.
see also: https://wiki.debian.org/InstallingDebianOn/HP
Greetings
Anna Takang