LVM installer: select percentage of VG to use
In the current Debian installer, if you select Guided Partitioning
with LVM, the entire volume group is allocated for filesystems and swap.
This means you lose much of the flexibility of LVM (e.g. being able to
choose which filesystems to extend later, or being able to create new
logical volumes). You could reclaim space later by shrinking one of the
filesystems/LVs, but this is relatively painful as it must be done off-line.
This pretty much forces you to do a long-winded manual install if you
want to leave space in your volume group, e.g. see
The Ubuntu installer fixed this by asking the user what percentage of
the volume group to use. This simple feature is a huge improvement.
Is there any chance this feature could be ported into Debian? Has this
been discussed before?
 I've just re-tested this with Jessie Beta 1, and the behaviour is
 This is from a virtualization workshop using Debian as the base
platform. We need to leave space in the volume group for creating
logical volumes for virtual machines, with Ganeti. Today we have to make
students do the whole long-winded process of creating logical volumes
for root, swap and /var by hand.