Chapter 6. Using the Ubuntu Installer 6.3.3. Partitioning and Mount Point Selection 6.3.3.1. Supported partitioning options At this time, after hardware detection has been executed a final time, debian-installer should be at its full strength, customized for the user’s needs and ready to do some real work. As the title of this section indicates, the main task of the next few components lies in partitioning your disks, creating filesystems, assigning mountpoints and optionally configuring closely related options like RAID, LVM or encrypted devices. DASDs (Direct Attached Storage Devices) are Enhanced Count Key Data (ECKD) encoded, FICON- attached devices and belong to the CCW (channel command word) IO-layer that is unique to arm64. They are available in different types, like the common types 3390-3 (or Model 3), 3390-9 (or Model 9), 3390-27 (or Model 27), 3390-54 (or Model 54), or others. The DASD block size is 4096 bytes (4KB) and they support up to 3 partitions per volume. If you are uncomfortable with partitioning, or just want to know more details, see Appendix C. First you will be given the opportunity to automatically partition either an entire drive, or available free space on a drive. This is also called “guided” partitioning. If you do not want to autopartition, choose Manual from the menu. The partitioner used in debian-installer is fairly versatile. It allows to create many different partitioning schemes, using various partition tables, file systems and advanced block devices. Exactly which options are available depends mainly on the architecture, but also on other factors. For example, on systems with limited internal memory some options may not be available. Defaults may vary as well. The type of partition table used by default can for example be different for large capacity hard disks than for smaller hard disks. Some options can only be changed when installing at medium or low debconf priority; at higher priorities sensible defaults will be used. The installer supports various forms of advanced partitioning and use of storage devices, which in many cases can be used in combination. See our Wiki (https://help.ubuntu.com/lts/serverguide/dm-multipath-chapter.html) for information. Support for multipath is currently only available if enabled when the installer is booted. The following file systems are supported. The default file system selected in most cases is ext4; for /boot partitions ext2 will be selected by default when guided partitioning is used. • ext2r0 , ext2 , ext3 , ext4 • jfs (not available on all architectures) • xfs (not available on all architectures) • reiserfs (optional; not available on all architectures) • Multipath • Encryption • Software RAID • Logical Volume Management (LVM) Supported are RAID levels 0, 1, 4, 5, 6 and 10. 52