If you are working with computers at the level of system administrator or advanced user, you have surely seen the situation where some disk partition (usually the most important one) was short on space, while some other partition was grossly underused and you had to manage this situation with moving stuff around, symlinking, etc. To avoid the described situation you can use Logical Volume Manager (LVM). Simply said, with LVM you can combine your partitions (physical volumes in LVM lingo) to form a virtual disc (so called volume group), which can then be divided into virtual partitions (logical volumes). The point is that logical volumes (and of course underlying volume groups) can span across several physical discs. Now when you realize you need more space for your old 160GB /home partition, you can simply add a new 300GB disc to the computer, join it with your existing volume group and then resize the logical volume which holds your /home filesystem and voila — your users have some room again on their renewed 460GB partition. This example is of course a bit oversimplified. If you haven't read it yet, you should consult the LVM HOWTO. LVM setup in &d-i; is quite simple. At first, you have to mark your partitions to be used as physical volumes for LVM. (This is done in partman in the Partition settings menu where you should select Use as: physical volume for LVM .) Then start the lvmcfg module (either directly from partman or from the &d-i;'s main menu) and combine physical volumes to volume group(s) under the Modify volume groups (VG) menu. After that, you should create logical volumes on the top of volume groups from the menu Modify logical volumes (LV). After returning from lvmcfg back to partman, you will see any created logical volumes in the same way as ordinary partitions (and you should treat them like that).