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). There is no widely accepted standard to identify partitions containing LVM data on Apple Power Macintosh hardware. On this particular hardware, the above procedure for creating physical volumes and volume groups will not work. There is a good workaround for this limitation, provided you are familiar with the underlying LVM tools. To install using logical volumes on Power Macintosh hardware you should create all the disk partitions for your logical volumes as usual. In the Partition settings menu you should choose Use as: Do Not Use for these partitions (you will not be offered the option to use the partition as a physical volume). When you are done with creating all your partitions, you should start the logical volume manager as usual. However, since no physical volumes have been created you must now access the command shell available on the second virtual terminal (see ) and create them manually. Use the pvcreate command at the shell command prompt to create a physical volume on each of your chosen partitions. Then use the vgcreate command to create each volume group you want. You can safely ignore any errors about incorrect metadata area header checksums and fsync failures while doing this. When you have finished creating all your volume groups, you should go back to the first virtual terminal and skip directly to the lvmcfg menu items for logical volume management. You will see your volume groups and you can create the logical volumes you need as usual. 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).